ultrasonic ceramic sensors (ultrasonic ceramic transducers) type: u/h/s/q/g ultrasonic ceramic sensor consisting of a disc type/a bimorph type piezoelectric ceramic vibrator is a sensor for transmitting and receiving ultrasonic wave in the air. n features l high output s.p.l.: 130 db min. (ex. efrtgb38k1) l high sensitivity: e45 db min. (ex. efrrub40k5) l excellent temperature and humidity durability l small in size n precautions for safety (see page 231) ultrasonic ceramic sensors n explanation of part numbers e f r ef n recommended applications ultrasonic wave transmitter and receiver for; l proximity switch for burglar alarm system, parking meter and automatic door opener l remote control equipment for such as air conditioner and garage door opener l detection of objects. l back alarm system for automobiles and distance meter.
n ratings and characteristics ultrasonic ceramic sensors type standard type part no. efrrub40k5 efrtub40k5 efrrub25k5 efrtub25k5 item nominal frequency (khz) 40.0 40.0 25.0 25.0 sensitivity (db) ] e45 min. ? e45 min. ? sound pressure level (db) ]] ? 112 min. ? 105 min. bandwidth (khz) 4.0 min. 4.0 min. 2.5 min. 2.5 min. application receiver transmitter receiver transmitter maximum input voltage (vrms) ? 20 ? 20 operating temperature range (?c) e20 to 60 type compact type temperature stable type part no. efrrhb40k5 efrthb40k5 efrrsb40k5 efrtsb40k5 item nominal frequency (khz) 40.0 40.0 40.0 40.0 sensitivity (db) ] e47 min. ? e50 min. ? sound pressure level (db) ]] ? 110 min. ? 105 min. bandwidth (khz) 4.0 min. 4.0 min. 4.0 min. 4.0 min. application receiver transmitter receiver transmitter maximum input voltage (vrms) ? 20 ? 20 operating temperature range (?c) e20 to 60 e40 to 100 type enclosed type high power type part no. efrrqb40k5 efrtqb40k5 efrrgb38k1 efrtgb38k1 item nominal frequency (khz) 40.0 40.0 38.0 38.0 sensitivity (db) ] e55 min. ? e55 min. ? sound pressure level (db) ]] ? 105 min. ? 130 min. (at 200 vp-p) bandwidth (khz) 1.0 min. 1.0 min. 1.0 min. 1.0 min. application receiver transmitter receiver transmitter maximum input voltage (vrms) ? 20 ? 200 vp-p 2 ms on, 200 ms period operating temperature range (?c) e20 to 60 e20 to 60 ] 0 db=1 v/pa ]] 0 db=2 10 e5 pa note: combiend use type please contact us for more information.
n dimensions in mm (not to scale) n test circuits diagram rl : 3.9 k w ucs : ultrasonic ceramic sensor scm : standard condenser microphone br?el & kj?r 4135 amp. : amplifier br?el & kj?r 2606 osc. : oscillator br?el & kj?r 1013 rec. : recorder br?el & kj?r 2305 tw. : tweeter ucs : ultrasonic ceramic sensor scm : standard condenser microphone br?el & kj?r 4135 amp. : amplifier br?el & kj?r 2606 osc. : oscilator br?el & kj?r 1013 rec. : recorder br?el & kj?r 2305 ein : 10 vrms. ultrasonic ceramic sensors test circuit diagram for receiver test circuit diagram for transmitter [sound pressure level] maximum sound pressure level from the specimen shall be measured in accordance with the specified test circuit and the specified test conditions. the output sound pressure shall be expressed in decibeles (db), where 2 10 e5 pa is 0 db. type u type h type s type q type g standard type compact type temperature stable type enclosed type high power type [sensitivity] output voltage of the specimen shall be measured in accordance with the specified test circuit and the specified test conditions. the output voltage shall be expressed in decibeles (db), where 1 v/pa is 0 db.
n typical characteristics frequency characteristics (sensitivity) frequency characteristics (sound pressure level) type q/g directivity ultrasonic ceramic sensors type u/h/s efrtub25k efrrub25k w w w w characteristic change vs. load resistance type u/h/s (40 khz) type q/g w w w w
ultrasonic ceramic sensors n design engineering notes 1. application of dc voltage dc voltage shall not be applied to the ultrasonic sensors because insulation resistance may deteriorate. 2. maximum input voltage the ultrasonic sensors shall not be operated beyond the specified maximum input voltage in the catalog or the specifications. 3. characteristics change owing to load impedance center frequency and sensitivity change in accordance with load impedance. therefore, the load characteristics chart shall be taken into consideration in designing circuit. 4. in the design of transmitting circuits it shall be noted that the impedance of the device is as low as 500 w (approximately) at the resonance frequency. n mounting notes 1. installation it is recommended to hold the ultrasonic sensors by means of rubber ] sheets or cushions for absorption of mechanical stresses such as shock and vibration. ] except sulfurated rubber 2. soldering soldering of the lead terminals shall be done at a position of 2.5 mm or more apart from bottom plain of the devices. 3. bending force to the terminals abnormal bending force shall not be applied to the terminals of the sensors, otherwise holding parts of the terminals may be easily broken, resulting in failures and damages of the devices. 4. directivity please be cafeful enough in deciding facing position of the sensor because of directivity. n storage notes 1. environmental conditions the ultrasonic sensors shall not be operated and/or stored under following environmental conditions; a) to be exposed directly to water or salt water. b) under conditions of dew formation or frost. c) under conditions of corrosive atomosphere such as hydrogen sulfide, sulfurous acid, chlorine and ammonia. 2. long term storage the ultrasonic sensors shall not be stored under severe conditions of high temperature and high humidity. store them indoors under 40 ?c max. and 75 %rh max. use them within one year and check the solderbility before use. precautions for handling because the ultrasonic sensors are designed for use in the air, they can not be used under the water or others liquid.
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