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switching and sensing solutions a pr essur e & v acuum switches
1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. herga electric limited is an independent uk manufacturer of switching systems. in addition to pressure and vacuum switches, we offer other innovative switching solutions:- hergair airswitching systems herga footswitches hergalite fibre optics / infra red safety products herga hand controls our expertise spans the automotive, medical, packaging, domestic appliance and spa industries. herga is driven to respond rapidly to delight our customers. herga seeks to develop its relations with customers to achieve their business goals. global presence our distributor network covering the worlds major markets enables technical help and assistance to be just a phone call away. continuous improvement hergas approval to iso 9002 ensures that we are fully in control of our quality. however, this is just the starting point for an aspiring world class company. we encourage training and development and continuous improvements at individual, team and company level. how can we help you? this brochure provides a brief overview of our product range. if you require further information, please contact us at our e-mail address: herga.electric@dial.pipex.com hergas customers worldwide include bmw/rover electrolux jacuzzi rs components siemens general electric
pressure & vacuum switches 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. 6702 high pressure switch high pressure switch all plastic construction. ranges 1.4-13.8 bar (20-200 psi). two (2) pole electrical switching. page pv1 & 2 6773 double diaphragm pressure switch double diaphragm construction to meet double insulation requirements of en 60335-2-60. water presence detection. page pv3 6761 and 6763 low air pressure vacuum switches printed circuit board mounted, pressure/vacuum switches. ul versions available. range from (0.015 bar - 1.0 bar pressure) (-0.015 bar - 0.670 bar vacuum). page pv4 6741 and 6742 medium pressure switches constructed in nylon 12 material (pressure range 0.1 bar to 8.2 bar). single or double pole in 8 adjustable switch ranges. ul versions available. page pv5 & 6 6731 and 6732 low pressure switches constructed in nylon 12 material (pressure range (0.0037 bar to 0.137 bar). single or double pole in 3 adjustable switch ranges. ul versions available. page pv7 & 8 6753 low air pressure/vacuum switches small versatile compact differential switch with low contact inertia for rapid switching (range 2.5 mbar to 40 mbar). page pv9 & 10 6721 and 6722 vacuum switches constructed in nylon 12 material (vacuum range -0.0075 bar to -0.670 bar). single or double pole in 5 adjustable switch ranges. ul versions available. page pv11 & 12 pressure conversion chart for more commonly used measurements, including flow, liquid, force and weight equivalents. page pv13 certification markings covers most worldwide authorities/certification marks. page pv14 fax back sheet for your fast quotation service. page pv16 page pv15 accessories / switch housings air and electrical connections are available for all pressure and vacuum switches. please also refer to airswitching section or contact herga for details.
6702 ~ high pressure switch 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. 6702 1. model number 2. operating pressure a 20 - 50 psi (1.40 - 3.45 bar) red spring b 40 - 100 psi (2.76 - 6.89 bar) white spring c 80 - 200 psi (5.52 - 13.79 bar) blue spring 3. additional operating (springs) a 20 - 50 psi (1.40 - 3.45 bar) b 40 - 100 psi (2.76 - 6.89 bar) c 80 - 200 psi (5.52 - 13.79 bar) d 20 - 50 psi (1.40 - 3.45 bar) & 40 - 100 psi (2.76 - 6.89 bar) e 40 - 100 psi (2.76 - 6.89 bar) & 80 - 200 psi (5.52 - 13.79 bar) f 80 - 200 psi (5.52 - 13.79 bar) & 20 - 50 psi (1.40 - 3.45 bar) g 20 - 50 psi (1.40 - 3.45 bar) & 40 - 100 psi (2.76 - 6.89 bar) & 80 - 200 psi (5.52 - 13.79 bar) z no additional springs supplied 4. electrical microswitching rating a 21a 250v ac silver change over contacts b 0.1a 250v ac gold change over contacts c 0.1a 24v ac/dc gold change over contacts 5. packaging and label option a herga individually packed in plain carton b herga vacuum form tray (for quantities 10+) 0 0 00 benefits v high pressure switch, all plastic construction (glass loaded nylon) v alternate diaphragm and connectors available for volume orders v excellent repeatability v switches have adjustable pressure and differential v specific settings can be set for volume orders v ip65 enclosures class ii double insulated
6702 ~ high pressure switch 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. 6702 pressure switch the industrial pressure switch is moulded entirely in plastic with the exception of the pressure connection and is water, oil and dust proof to ip65. the switches have excellent repeat accuracy, even over widely varying ambient conditions. the operating pressure is adjustable externally using the thumb screw on the top and the approximate pressure setting can be seen through a window in the cover. to discourage unauthorised tampering, the adjusting screw can be locked in position with an m1.5mm allen screw. the microswitches have independent vernier adjustment and are normally set to operate within 2 psi on rising pressure. where two pressure levels are to be controlled, the switches can be adjusted separately so that one switch will operate at up to 80% of the level of the second. the switches can also be set to operate simultaneously on falling pressure instead of rising pressure. the pressure switch is of class ii construction with double insulation. for quantity orders, many special options are available, please enquire:- v single or double pole switching set to specific pressure levels v alternative connector sizes v alternative diaphragms and metal chambers to resist particular fluids v installation and setting instructions are supplied with each product withstand pressure 500 psi (34.5 bar) setting accuracy when set by herga 10% temperature range -5?c to +70?c diaphragm fabric reinforced nitrile weight 300g other information acetone ammonia (liquid) amyl alcohol to 20?c automotive brake fluid beer butane 3 carbon dioxide (dry) 3 citric acid 3 copper sulphate (sol.) compressed air 3 cutting oil 3 diesel oil 3 detergent solution 3 fuel oil 3 glycol 3 hydraulic oil 3 hydrogen 3 lubricating oil 3 milk mineral oil 3 natural gas 3 oxygen to 70?c 3 petrol 3 plating solution (chrome) salt water sewage 3 turpentine 3 vinegar water 3 3 3 3 3 3 3 3 3 3 3 suitability for use with different operating media pressure medium 6702 silver contact microswitch data average life expectancy mechanical 1.0 x 10 6 2.0 x 10 5 @ 10a 1.0 x 10 4 @ 21a max. electrical load electrical rating electrical voltage res. ind. (pf 0.75 motor) ac 250v 250v 125v 6v 12v 24v 60v 110v 220v 21a 15a 8a 1a 0.5a 0.25a 21a 15a 7a 0.5a 0.2a 0.1a 21a 21a 21a 8a 1hp 2hp dc gold contact microswitch data average life expectancy mechanical 1.0 x 1.0 6 2.0 x 10 5 @ 10a 1.0 x 10 4 @ 21a max. electrical load electrical rating electrical voltage res. ind. (pf 0.75 motor) ac ul/csa only 250v 125v 0.1a 0.1a 0.05 ----- n/a ----- switch standards: en 60730, en 61058 and ul 508 approvals available: ce, beab, csa, demco, imq, kema, nemco, ove, semco, set i, sev, ul, vde 3 = recommended = suitable with modifications note: dry switching - if switching low power circuits, low current (4 to 100 milliamperes) and low voltage (below 30v), consult herga or refer to gold contact in section 4 of the opposite page. herga do not accept liability for any pressure operated device used outside the pressure range specified by the company. 3 note: differentials are approximate
1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. 6773 ~ double diaphragm pressure switch 6773 1. model number 2. pressure range a 250mm h 2 o to 760mm h 2 o standard 3. caps a side entry std spout std orientation 4.0mm spout b side entry std spout rotated 90 ? viewed from cap 4.0mm spout c side entry std spout rotated 180 ? viewed from cap 4.0mm spout d side entry std spout rotated 270 ? viewed from cap 4.0mm spout e side entry long spout 4.0mm std orientation f side entry long spout rotated 90 ? viewed from cap 4.0mm spout g side entry long spout rotated 180 ? viewed from cap 4.0mm spout h back entry short thread 4.0mm spout. not suitable for ? ring j back entry long thread 4.0mm spout k back entry long thread 2.0mm spout l long thread spout rotated @ 90 ? 4.0mm spout 4. bleed a no bleed cap j with bleed cap 5. nut specification a black moulded nut b black moulded nut and ? ring (only available with options 3j, k & l above) 6. authority a european tag configuration 7. terminal combinations a 3 blade qc 6.3mm x 0.8mm b 2 blade qc 6.3mm x 0.8mm normally open contacts c 2 blade qc 6.3mm x 0.9mm 90? crank normally open contacts 8. microswitch rating a 0.1a 125/250v ac gold contacts (not available with option 7c) b 10a 1/4 hp 125/250v ac c 21a 250v ac 1 hp 125v ac 2 hp 250v ac aa benefits v specified to en 60335-2-60 double insulated for water detection v various microswitch options v gold contacts available v other pressures available up to 10 psi v multiple cap and spout options available
6761 & 6763 ~ low air pressure vacuum switches (slow make contacts) 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. benefits v a range of small switches designed for direct mounting onto printed circuit boards v ul versions available v various spout orientations available v double diaphragm versions available upon request v available with base or side tube entry v silver or gold contact options v switches can be factory set within specified tolerances v 'o' ring seals available for dust and water tight applications, back entry versions only printed circuit board mounting switches model no 6761 (vacuum) 6763 (pressure) pressure/vacuum range minimum 150mm (6 ins) wg 150mm (6 ins) wg maximum 670 millibar (9.8) psi 1.0 bar (14.7) psi maximum differential approximately 0.06 ins wg approximately 0.06 ins wg pressure/vacuum range adjustable variants adjustable variants body withstand pressure 2.7 bar (40) psi 2.7 bar (40) psi air bleed version available upon request available upon request flow rate litre / min (with air bleed) 8 - 30cc/min @ 31 ins wg 8 - 30cc/min @ 31 ins wg pressure connection 4mm spout for side and back entry 4mm spout for side and back entry 2mm spout for back entry only 2mm spout for back entry only lower spout ? vacuum upper spout ? pressure connecting tube reference 4mm spout = 2311-01 or 2311-08 4mm spout = 2311-01 or 2311-08 2mm spout = 2311-03 2mm spout = 2311-03 temperature range -10?c to 85?c (flow solder 220?c for 5 sec) -10?c to 85?c (flow solder 220?c for 5 sec) electrical data switch single pole normally open single pole normally open contact rating maximum 0.5a res 250v ac (silver contacts) 0.5a res 250v ac (silver contacts) ul 50ma res 250v ac 50ma res 250v ac (maximum ratings may not be achieved at low pressure settings) dry switching maximum recommended current 10ma 24v dc (ul) 10ma 24v dc (ul) body glass filled polyester glass filled polyester diaphragm silicone as standard silicone as standard contacts silver or gold plated copper pins silver or gold plated copper pins mechanical life 1 x 10 6 cycles 1 x 10 6 cycles weight (grams) 8grms 8grms 6761/6763 vacuum and pressure switch range a miniature, compact low pressure switch designed for direct fitting by solder pins to printed circuit boards. both vacuum and pressure ports are provided making the unit ideal for differential switching. typical applications are indicators, emergency cut-out and alarms, filter and low pressure/vacuum monitoring. the switch is made to order for specific applications, the actual operating pressures or vacuum being set during production. however, final adjustment may be made after installation by the slotted screw in the base. the body construction allows the two ports to be set at any angle to each other. non std shown as 270?
6741 / 6742 ~ medium pressure switches 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. benefits v switches set to specific rising or falling pressures v ul recognised versions available v high performance repeatability v single or double pole switching v customised settings available upon request v various connector options available silver contact microswitch data average life expectancy mechanical 1.0 x 10 6 2.0 x 10 5 @ 10a 1.0 x 10 4 @ 21a max. electrical load electrical rating electrical voltage res. ind. (pf 0.75 motor) ac 250v 250v 125v 6v 12v 24v 60v 110v 220v 21a 15a 8a 1a 0.5a 0.25a 21a 15a 7a 0.5a 0.1a 0.1a 21a 21a 21a 8a 1hp 1hp dc gold contact microswitch data average life expectancy mechanical 1.0 x 10 6 2.0 x 10 6 @ 10a 1.0 x 10 4 @ 21a max. electrical load electrical voltage res. ind. (pf 0.75 motor) ac ul/csa only 250v 125v 0.1a 0.1a 0.05 ----- n/a ----- switch standards: en 60730, en 61058 and ul 508 approvals available: ce, beab, csa, demco, imq, kema, nemco, ove, semco, set i, sev, ul, vde nb herga do not accept liability for any pressure operated device used outside the pressure range specified by the company. model no 6742-20/30/40/50/60 6742-70/80/90 electrical switch data 2 pole change over 2 pole change over contact rating 21 (8) a 250v ac 21 (8) a 250v ac pressure connection brass 1 / 8 " bspt brass 1 / 8 " bspt setting accuracy 10% as standard 10% as standard withstand pressure 25 psi or x 2 150 psi 10 bar temperature range -5?c to + 70?c -5?c to + 70?c body material nylon 12 nylon 12 nitrile fabric diaphragm neoprene reinforced fitted in brass pressure capsule spring spring steel spring steel weight 50gm 85gm p.s.i bar 6742-20 1.5 - 3.5 0.10 - 0.24 see chart 1 6742-30 3.0 - 5.5 0.20 - 0.37 see chart 1 6742-40 5 - 10 0.34 - 0.68 see chart 1 6742-50 8 - 18 0.54 - 1.22 see chart 2 6742-60 16 - 30 1.08 - 2.04 see chart 2 6742-70 25 - 55 1.70 - 3.79 see chart 3 6742-80 45 - 75 3.1 - 5.17 see chart 3 6742-90 60 - 120 4.14 - 8.27 see chart 3 model no pressure range differential (fixed) special options are available for quantity orders v diaphragms in silicon rubber, nitrile, epdm v switches with wide or close differentials v springs in stainless steel v npt connectors available electrical rating
6741 / 6742 ~ medium pressure switches 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. suitability for use with different operating media pressure medium chemical compatibility 6742/20/30/40 50 & 60 6742/70/80 & 90 diaphragms acetone ammonia (liquid) amyl alcohol to 20?c automotive brake fluid beer benzyl alcohol butane 33 carbon dioxide - dry 33 citric acid 33 copper sulphate (sol.) compressed air 33 cutting oil 3 diesel oil 3 detergent solution 3 fuel oil 3 glycol 33 hydraulic oil 3 hydrogen 33 lubricating oil 3 milk mineral oil 3 natural gas 33 nitric acid (dil.) oxygen to 70?c 33 petrol 3 plating solution (chrome) salt water sewage 3 sulphur dioxide turpentine 3 vinegar water 33 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 key: 3 = recommended = suitable with modification = not suitable 3 2.0 1.5 1.0 0.5 bar psi 30 25 20 15 10 5 chart 2 0.5 1.0 1.5 2.0 bar 5 10 15 20 25 30 psi max differential min differential falling pressure 6472-60 6472-50 rising pressure 6472-90 8 7 6 5 4 3 bar psi 120 110 100 90 80 70 60 50 40 30 20 chart 3 2 3 4 5 6 7 8 20 30 40 50 60 70 80 90 100 110 120 max differential falling pressure 6472-70 rising pressure min differential 6472-80 psi bar 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 bar psi 10 8 6 4 2 0 chart 1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 bar 2 4 6 8 10 psi max differential min differential 6472-30 6472-40 6472-20 rising pressure note: differentials are approximate alternative pressure connections 1 / 8 ? npt pressure connector
6731 / 6732 ~ low pressure switches 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. benefits v these switches have been designed primarily for the oem manufacturer who requires low cost and high reliability v ul recognised versions available v the switches have excellent repeat accuracy v double pole switching available upon request v wide choice of microswitch options including tab configurations pressure switches 6731-03 2 x 10 6 0.2 x 10 6 @ 1a max electrical load electrical rating resistive 3a 3a 3a 3a 1a 1a 0.5a 0.25 1a 1a 1a 1a 0.5a 0.5a 0.2a 0.1a inductive average life expectancy ac dc switch standards: en 60730, en 61058 and ul 508 approvals available ce, beab, csa, demco, imq, kema, nemco, ove, semco, set i, sev, ul, vde. approved to bs 3955 part iii mechanical electrical voltage 125v 250v 6v 12v 24v 60v 110v 220v note: dry switching if switching low power circuits, low current (4 to 100 milliamperes) and low voltage (below 30v), consult herga for special switches. nb - herga do not accept liability for any pressure operated device used outside the pressure range specified by the company. inches water mm water 6731-03 1.5 - 7 40 - 180 see chart 1 6731-06 5 - 25 127 - 635 see chart 1 6731-10 20 - 55 510 - 1400 see chart 1 model no pressure range differential (fixed) special options are available for quantity orders v switches set to specific operating pressure, rising or falling v diaphragms in silicon rubber, nitrile, epdm v switches with wide or close differentials v springs in stainless steel model no electrical switch contact rating pressure connection setting accuracy withstand pressure body material diaphragm spring weight single pole change over 3(1)a 250v ac side entry spout 4mm o/d 10% as std 25 psi nylon 12 neoprene spring steel 50gm single pole change over 10(3)a 250v ac side entry spout 4mm o/d 10% as std 25 psi nylon 12 neoprene spring steel 50gm single pole change over 21(8)a 250v ac side entry spout 4mm o/d 10% as std 25 psi nylon 12 neoprene spring steel 50gm 6731-03 6731-06 6731-10 6731-06 2 x 10 6 0.2 x 10 6 @ 6a 50k @ 10a max electrical load resistive 10a 10a 10a 5a 5a 1a 0.5a 0.25a 10a 10a 10a 3a 3a 0.5a 0.2a 0.1a inductive 0.5hp 0.5hp motor (pf0.75) 6731-10 1.0 x 10 6 0.2 x 10 6 @ 10a 10k @ 21a max electrical load resistive 21a 21a 21a 15a 8a 1a 0.5a 0.25a 15a 15a 21a 15a 7a 0.5a 0.2a 0.1a inductive 1hp 2hp motor (pf0.75)
6731 / 6732 ~ low pressure switches 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. suitability for use with different operating media pressure medium chemical compatibility 6731 diaphragms acetone ammonia (liquid) amyl alcohol to 20?c automotive brake fluid beer benzyl alcohol butane 3 carbon dioxide - dry 3 citric acid 3 copper sulphate (sol.) compressed air 3 cutting oil 3 diesel oil 3 detergent solution 3 fuel oil 3 glycol 3 hydraulic oil 3 hydrogen 3 lubricating oil 3 milk mineral oil 3 natural gas 3 nitric acid (dil.) oxygen to 70?c 3 petrol 3 plating solution (chrome) salt water sewage 3 sulphur dioxide turpentine 3 vinegar water 3 3 3 3 3 3 3 3 3 3 3 key: 3 = recommended = suitable with modification = not suitable 3 6731-03 6731-10 6731-06 falling pressure chart 1 mm wg in wg in wg mm wg max differential min differential rising pressure 1400 1200 1000 800 600 400 200 0 60 50 40 30 20 10 0 0 10 20 30 40 50 60 0 200 400 600 800 1000 1200 1400 note: differentials are approximate
6753 ~ low air pressure / vacuum switches 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. 6753 1. model number 2. operation a normally open - pressure b normally closed - vacuum 3. bleed adjuster options a bleed a side only, vacuum n/o to n/c, pressure n/c to n/o b bleed b side only, vacuum n/o to n/c, pressure n/c to n/o c bleed both sides vacuum / pressure d no bleed variant either side vacuum / pressure 4. bleed setting a 100 - 300 cc/min factory setting j no bleed setting 5. pressure setting a 2.25" wg 0.5" std b 2" wg 0.5" c 3" wg 0.5" d 4" wg 0.5" e 6" wg 10% f 8" wg 10% g 10" wg 10% h 12" wg 10% j 14" wg 10% k 16" wg 0 - 10% 6. packaging options a vacuum form tray (100 off volumes - ideal for oem applications) b poly bag (individual) 0 00 benefits v sensitive versatile switch - ideal for long tube length applications v normally open or normally closed contact configuration v ideal for switching low power circuits v bleed versions available for temperature compensation v easily adjustable settings v custom pressure, vacuum and bleed settings available upon request
6753 ~ low air pressure / vacuum switches 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. pressure/vacuum range minimum 25mm (1 in) wg maximum 400mm (16 ins) wg maximum differential 400mm (16 ins) wg 50mm (2.25 ins) wg (contacts normally open) other settings available see note 2) maximum differential between 0.34 bar (5 psi) pressure connection body withstand pressure 1.0 bar (14.7 psi) air bleed version see choice options 3 & 4, other settings available, see note 3) flow rate litre / min standard 100 - 300 cc/min @ 5 psi connection position base see note 2) 4mm dia spouts pressure connection for reducing connectors, please refer to accessories page connecting tube reference 2311-08 or 2311-01 temperature range -5?c to 50?c electrical data switch single pole, n/open / n/closed dry switching minimum current 5ma 4v dc body glass filled nylon 12 diaphragm neoprene contacts gold plated silver mounted on phosphor-bronze blades contact resistance 0.05 ohms mechanical life 1 x 10 6 cycles weight (grams) 10grms technical data pressure standard factory setting 6753 pressure switch range for very sensitive pressure, vacuum and differential pressure switching. the 6753 range of switches provide a high specification in a small, versatile body shell. great care has been taken in the switch unit design, keeping the moving mass and therefore inertia to a minimum. this means that it can operate at a high cycle rate with low pressure, vacuum or pressure differential. this design feature can be used when measuring pressure pulses such as on component counting applications and used with herga safe edges. the switch will operate very rapidly keeping the switch delay to a minimum. 1) for good repeatable switching, the contacts are gold plated on solid silver. the electrical rating of the switch is dependent on the contact pressure. this pressure is dependent on the air pressure. thus, for very sensitive setting the permissible switching current will be lower than normal. 2) the standard switch can be adjusted to give normally closed or normally open contacts depending on the application. for operation on pressure with normally closed contacts, connect to air connection ? and screw in sensitivity adjusting screw ? until contacts are normally closed. for operation on pressure with normally open contacts, connect to air connection ? and set with contacts normally open. 3) a separate version, (see bleed options), is provided with adjustable air bleeds on both sides of the diaphragm. these air bleeds are adjusted to a level which is suitable for most applications involving safe edges or elbows, and prevent pressure or vacuum building up inside when the ambient temperature or atmospheric pressure changes. contact rating maximum 0.5a res 250v ac (maximum ratings may not be achieved at low pressure settings)
6721 / 6722 ~ vacuum switches 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. benefits v these switches have been designed primarily for the oem manufacturer who requires low cost and high reliability v ul recognised versions available v the switches have excellent repeat accuracy v double pole switching available upon request v wide choice of microswitch options available including tab configurations pressure switches 6731-03 2 x 10 6 0.2 x 10 6 @ 1a max electrical load electrical rating resistive 3a 3a 3a 3a 1a 1a 0.5a 0.25a 1a 1a 1a 1a 0.5a 0.5a 0.2a 0.1a inductive average life expectancy ac dc switch standards: en 60730, en 61058 and ul 508 approvals available ce, beab, csa, demco, imq, kema, nemco, ove, semco, set i, sev, ul, vde. approved to bs 3955 part iii mechanical electrical voltage 125v 250v 6v 12v 24v 60v 110v 220v note: dry switching if switching low power circuits, low current (4 to 100 milliamperes) and low voltage (below 30v), consult herga for special switches. nb - herga do not accept liability for any vacuum operated device used outside the pressure range specified by the company. inches water mm water 6721-03 3 - 8 75 - 200 see chart 1 6721-06 7 - 15 180 - 380 see chart 1 6721-20 13 - 32 330 - 810 see chart 1 6721-30 28 - 80 710 - 2030 see chart 2 6721-40 75 - 270 1900 - 6860 see chart 2 model no vacuum range differential (fixed) special options are available for quantity orders v switches set to specific operating vacuum, rising or falling v diaphragms in silicon rubber, nitrile, epdm v switches with wide or close differentials v springs in stainless steel model no electrical switch data contact rating vacuum connection setting accuracy temperature range body material diaphragm spring (in vacuum cavity) single pole change over 3(1)a 250v ac side entry spout 4mm o/d 10% std -5?c to + 70?c nylon 12 neoprene spring steel single pole change over 10(3)a 250v ac side entry spout 4mm o/d 10% std -5?c to + 70?c nylon 12 neoprene spring steel single pole change over 21(8)a 250v ac side entry spout 4mm o/d 10% std -5?c to + 70?c nylon 12 neoprene spring steel 6721-03 6721-06 6721-20/30/40 6731-06 2 x 10 6 0.2 x 10 6 @ 6a 50k @ 10a max electrical load resistive 10a 10a 10a 5a 5a 1a 0.5a 0.25a 10a 10a 10a 3a 3a 0.5a 0.2a 0.1a inductive 0.5hp 0.5hp motor (pf0.75) 6731-10 1.0 x 10 6 0.2 x 10 6 @ 10a 10k @ 21a max electrical load resistive 21a 21a 21a 15a 8a 1a 0.5a 0.25a 15a 15a 21a 15a 7a 0.5a 0.2a 0.1a inductive 1hp 2hp motor (pf0.75) 1) 1) 1) note: the spring is fitted in the vacuum cavity in contact with the media
6721 / 6722 ~ vacuum switches 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. suitability for use with different operating media vacuum medium chemical compatibility 6721 diaphragms acetone ammonia (liquid) amyl alcohol to 20?c automotive brake fluid beer benzyl alcohol butane 3 carbon dioxide - dry 3 citric acid 3 copper sulphate (sol.) compressed air 3 cutting oil 3 diesel oil 3 detergent solution 3 fuel oil 3 glycol 3 hydraulic oil 3 hydrogen 3 lubricating oil 3 milk mineral oil 3 natural gas 3 nitric acid (dil.) oxygen to 70?c 3 petrol 3 plating solution (chrome) salt water sewage 3 sulphur dioxide turpentine 3 vinegar water 3 3 3 3 3 3 3 3 3 3 3 6721-30 reducing vacuum 6721-20 reducing vacuum 6721-06 6721-03 max differential min differential increasing vacuum chart 1 0 -10 -20 -30 -40 -50 mm hg in wg 0 5 10 15 20 25 30 in wg -30 -25 -20 -15 -10 -5 0 -50 -40 -30 -20 -10 0 mm hg max differential min differential increasing vacuum chart 2 -50 -100 -150 -200 -250 -300 -350 -400 -450 -500 mm hg in wg -25 -50 -75 -100 -125 -150 -175 -200 -225 -250 -275 in wg -225 -200 -175 -150 -125 -100 -75 -80 -25 -10 -400 -350 -300 -250 -200 -150 -100 -50 mm hg 6721-40 key: 3 = recommended = suitable with modification = not suitable 3 note: differentials are approximate alternative vacuum connections back entry 1 / 8 ? bspt and npt connectors
pressure conversion table 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. p.s.i in/h 2 0 in/hg mm/h 2 0 mm/hg kg/cm 2 bar mbar pa kpa p.s.i in/h 2 0 in/hg mm/h 2 0 mm/hg kg/cm 2 bar mbar pa kpa 1.0 27.71 2.036 703.1 51.75 .0703 .0689 68.95 6895 6.895 1.1 30.45 2.240 773.4 56.89 .0773 .0758 75.84 7584 7.584 1.2 33.22 2.443 843.7 62.06 .0844 .0827 82.74 8274 8.274 1.3 35.98 2.647 914.0 67.23 .0914 .0896 89.63 8963 8.963 1.4 38.75 2.850 984.3 72.40 .0984 .0965 96.52 9652 9.652 1.5 41.52 3.054 1055 77.57 .1055 .1034 103.4 10340 10.34 1.6 44.29 3.258 1125 82.74 .1125 1103 110.3 11030 11.03 1.7 47.06 3.461 1195 87.92 .1195 .1172 117.2 11720 11.72 1.8 49.82 3.665 1266 93.09 .1266 1241 124.1 12410 12.41 1.9 52.59 3.868 1336 98.26 .1336 1310 131.0 13100 13.10 2.0 55.36 4.072 1406 103.4 .1406 .1379 137.9 13790 13.79 2.1 58.13 4.276 1476 108.6 .1476 .1448 144.8 14480 14.48 2.2 60.90 4.479 1547 113.8 .1547 .1517 151.7 15170 15.17 2.3 63.67 4.683 1617 118.9 .1617 .1586 158.6 15860 15.86 2.4 66.43 4.886 1687 124.1 .1687 .1655 165.5 16550 16.55 2.5 69.20 5.090 1758 129.3 .1758 .1724 172.4 17240 17.24 2.6 71.97 5.294 1828 134.5 .1828 .1793 179.3 17930 17.93 2.7 74.74 5.497 1898 139.6 .1898 .1862 186.2 18620 18.62 2.8 77.51 5.701 1969 144.8 .1968 .1930 193.0 19300 19.30 2.9 80.27 5.904 2039 150.0 .2039 .1999 199.9 19990 19.99 3.0 83.04 6.108 2109 155.1 .2109 .2068 206.8 20680 20.68 3.1 85.81 6.312 2180 160.3 .2180 .2137 213.7 21370 21.37 3.2 88.58 6.515 2250 165.5 .2250 .2206 220.6 22060 22.06 3.3 91.35 6.719 2320 170.7 .2320 .2275 227.5 22750 22.75 3.4 94.11 6.922 2390 175.8 .2390 .2344 234.4 23440 23.44 3.5 96.88 7.126 2461 181.0 .2461 .2413 241.3 24130 24.13 3.6 99.65 7.330 2531 186.2 .2531 .2482 248.2 24820 24.82 3.7 102.4 7.533 2601 191.3 .2601 .2551 255.1 25510 25.51 3.8 105.2 7.737 2672 196.5 .2672 .2620 262.0 26200 26.20 3.9 108.0 7.940 2742 201.7 .2742 .2689 268.9 26890 26.89 4.0 110.7 8.144 2812 206.9 .2812 .2758 275.8 27580 27.58 4.1 113.5 8.348 2883 212.0 .2883 .2827 282.7 28270 28.27 4.2 116.3 8.551 2953 217.2 .2953 .2896 289.6 28960 28.96 4.3 119.0 8.775 3023 222.4 .3023 .2965 296.5 29650 29.65 4.4 121.8 8.958 3094 227.5 .3094 .3034 303.4 30338 30.34 4.5 124.6 9.162 2164 232.7 .3164 .3103 310.3 31030 31.03 4.6 127.3 9.366 3234 237.9 .3234 .3172 317.2 31720 31.72 4.7 130.1 9.569 3304 243.1 .3304 .3240 324.0 32400 32.40 4.8 132.9 9.773 3375 248.2 .3375 .3310 331.0 33100 33.10 4.9 135.6 9.976 3445 253.4 .3445 .3378 337.8 33780 33.78 5.0 138.4 10.18 3515 258.6 .3515 .3447 344.7 34470 34.47 5.1 141.2 10.38 3586 263.7 .3586 .3516 351.6 35160 35.16 5.2 143.9 10.59 3656 268.9 .3656 .3585 358.5 35850 35.85 5.3 146.7 10.79 3726 274.1 .3726 .3654 365.4 36540 36.54 5.4 149.5 10.99 3797 279.3 .3797 .3723 372.3 37230 37.23 5.5 152.2 11.20 3867 284.4 .3867 .3792 379.2 37920 37.92 pressure conversions lbf/ln 2 = pounds force per square inch (psi) 1 psi = 27.6804 in/h 2 o 1 psi = 2.03602 in/hg 1 psi = 68.9476 mbar 1 psi = 703.082 mm/h 2 o 1 psi = 0.0689 bar 1 in/h 2 o = 25.4 mm/h 2 o 1 in/h 2 o = 1.86832 mm/hg 1 in/h 2 o = 2.49089 flow dm 3 /s = cubic decimetres per second ft 3 /min = cubic feet per minute 1/min = litres per minute 1dm 3 /s = 2.119 ft 3 /min 1dm 3 /s = 60 litres/min 1lt/min = 0.0353 ft 3 /min liquid mi = millilitre fl oz = fluid ounce 1mi = 0.0352 fl/oz 1 litre = 0.21998 uk gallon force n = newton lbf = pounds force kgf = kilogram force 1 n = 0.225lbf 1 n = 0102kgf weight kg = kilogram lb = pound 1kg = 2.2045lb 5.6 155.0 11.40 3937 289.6 .3937 .3861 386.1 38610 38.61 5.7 157.8 11.60 4008 294.8 .4007 .3930 393.0 39300 39.30 5.8 160.5 11.81 4078 299.9 .4078 .3999 399.9 39990 39.99 5.9 163.3 12.01 4148 305.1 .4148 .4068 406.8 40680 40.68 6.0 166.1 12.22 4218 310.3 .4218 .4137 413.7 41370 41.37 6.1 168.8 12.42 4289 315.5 .4289 .4206 420.6 42060 42.06 6.2 171.6 12.62 4359 320.6 .4359 .4275 427.5 42750 42.75 6.3 174.4 12.83 4429 325.8 .4429 .4344 434.4 43440 43.44 6.4 177.2 13.03 4500 331.0 .4500 .4413 441.3 44130 44.13 6.5 179.9 13.23 4570 336.1 .4570 .4482 448.2 44820 44.82 6.6 182.7 13.44 4640 341.3 4640 .4550 455.0 45500 45.50 6.7 185.5 13.64 4711 346.5 .4710 .4619 461.9 46190 46.19 6.8 188.2 13.84 4781 351.7 .4781 .4688 468.8 46880 46.88 6.9 191.0 14.05 4851 356.8 .4851 .4757 475.7 47570 47.57 7.0 193.8 14.25 4922 362.0 .4921 .4826 482.6 48260 48.26 7.1 196.5 14.46 4992 367.2 .4992 .4895 489.5 48950 48.95 7.2 199.3 14.66 5062 372.3 .5062 .4964 496.4 49640 49.64 7.3 202.1 14.86 5132 377.5 .5132 .5033 503.3 50330 50.33 7.4 204.8 15.07 5203 382.7 .5203 .5102 510.2 51020 51.02 7.5 207.6 15.27 5273 387.9 .5273 .5171 517.1 51710 51.71 7.6 210.4 15.47 5343 393.0 .5343 .5240 524.0 52400 52.40 7.8 215.9 15.88 5484 403.4 .5484 .5378 537.8 53780 53.78 8.0 221.4 16.29 5625 413.7 .5625 .5516 551.6 55160 55.16 8.2 227.0 16.70 5765 424.1 .5765 .5654 565.4 56540 56.54 8.4 232.5 17.10 5906 434.4 .5906 .5792 579.2 57920 57.92 8.6 238.0 17.51 6047 444.7 .6046 .5929 592.9 59290 59.29 8.8 243.6 17.92 6187 455.1 .6187 .6067 606.7 60670 60.67 9.0 249.1 18.32 6328 465.4 .6328 .6205 620.5 62050 62.05 9.2 254.7 18.73 6468 475.8 .6468 .6343 634.3 63430 63.43 9.4 260.2 19.14 6609 486.1 .6609 .6481 648.1 64810 64.81 9.6 265.7 19.54 6750 496.5 .6749 .6619 661.9 66190 66.19 9.8 271.3 19.95 6890 506.8 .6890 .6757 675.7 67570 67.57 10.0 276.8 20.36 7031 517.1 .7031 .6895 689.5 68950 68.95 11.0 304.5 22.40 7734 568.9 .7734 .7584 758.4 75840 75.84 12.0 332.2 24.43 8437 620.6 .8437 .8274 827.4 82740 82.74 13.0 359.8 26.47 9140 672.3 .9140 .8963 896.3 98630 89.63 14.0 387.5 28.50 9843 724.0 .9843 .9652 965.2 96520 96.52 14.7 406.9 29.93 10340 760.2 1.033 1.014 1014 101400 101.4 15.0 415.2 30.54 10550 775.7 1.055 1.034 1034 103400 103.4 16.0 442.9 32.58 11250 827.4 1.125 1.103 1103 110300 110.3 17.0 470.6 34.61 11950 879.1 1.195 1.172 1172 117200 117.2 18.0 498.2 36.65 12660 930.9 1.265 1.241 1241 124100 124.1 19.0 525.9 38.68 13360 982.6 1.336 1.310 1310 131000 131.0 20.0 553.6 40.72 14060 1034 1.406 1.379 1379 137900 137.9 25.0 692.0 50.90 17580 1293 1.758 1.724 1724 172400 172. 4
certification markings 1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. japan miti netherlands kema new zealand secv secq secwa eansw etsa hect sanz norway nemko republic of south africa sabs sweden semko switzerland sev united kingdom asta bsi beab united states ul country agency mark country agency mark cebec d fi ema eur k b s beab ? or ? australia saa austria ove belgium cebec canada csa denmark demko europe many finland fei france ute germany vde india isi ireland iirs italy imq
1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. accessories: switch housings part number: 6819-00 variants the most economical and compact housing, produced especially for hergair switches. double insulated sealed enclosure is moulded in two tone black and white abs as standard. the lid has an integral rubber sealing gasket and captive screws. mounting holes and lid fixing screws are outside the seal, thus preventing the ingress of moisture and making the box waterproof to ip65. the standard 6819-00 housing is supplied with a cable gland for cable diameter 5mm to 7mm and a type 6418-00 air tube connector is fitted. the housing is suitable for all airswitches except model 6806. note: herga can offer many other variants of electrical housings in size and colour up to ip67. we also manufacture world-wide (plug in) switch housings with or without cordsets in conjunction with our airswitching systems. please contact us with your specific requirements . part number: 6816-00 variants diecast aluminium housing for airswitch types except 6806 models. finished in blue stove enamel. ideal for use where electrical screening is required. other colour variants are available upon request as are specified fixing positions to suit your requirements. where a number of airswitches are to be fitted in one box, herga can supply a variety of special boxes complete with multi-way air connectors and electrical connections as required. part number: 6819-01 blue flexible pvc protective boot for air and pressure switch types 6721, 6731, 6741, 6861, 6863 and 6869. covers all electrical connections and grips round outside of switch body. can be used with cable 5mm to 9mm diameter. we recommend a cable restraint is used in connection with this part. benefits v ip40 and ip67 housings with rear fixing positions v variations of air or electrical connections v unlimited options available - contact herga with your requirements v back entry versions for pressure switch connections v available for all herga switching systems v custom designed labels and housing colours available for volume oem requirements
1999 for further information tel: +44 (0)1284 701422 fax: +44 (0)1284 753112 issue 01 as a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. please see our conditions of sale. rapid response form (photostat and fax back) it is our goal to give you a response within 24 hours. by completing this form it will help us to help you! thank you. customer contact name tel: fax: ________________________________________________pressure ___________________________________________________vacuum industry: medical pool & spa chemical/process industrial other ______________________ classification: oem distributor / reseller end user other __________________________________ requirements: __________________ pressure. __________________ vacuum. _________________ differential pressure. if pressure or vacuum measured gauge (as in catalogue) or absolute? ___________________________________________ ________________ inches wg _________________ psi gauge operating range: ______________to________________________ herga to set we will set on rising on falling max pressure/vacuum unit will be subjected to ___________________________ setting preference __________________ max differential (diff. between rise & fall) ________________________________ min differential _______________________ media gas ___________________ temperature ___________________ ambient ___________________ to ________________ liquid _________________ temperature ____________________ media ___________________ to ________________ electrical: volts ______________ ac _______________/_______________ dc max current: amps___________hp___________ ______________ resistive ________________ inductive load description ______________________________________________ approval needed: ul csa other _______________________________________________________________________ contact configuration: single pole double pole gold contact mechanical: mounting preference 1/8?bspt brass 1/8?bspt stainless side spout centre spout 1/8?npt brass 1/8?npt stainless pcb mount other ____________________________________________________ application (what will switch control?) ________________________________________________________________________ ________________________________________________________________________ quantity required for prototype? ___________________________________ required date ________________________ annual production quantity? ___________________________________ start date ___________________________ current switch used? ___________________________________ price range __________________________ any problems with present unit? _____________________________________________________________________________ _____________________________________________________________________________

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