Air Ultrasonic Transducers radiate ultrasonic waves into the air and sense the reflected waves from objects within the radiation field to detect them or measure their distance.

Fuji & Co. offers this sensor:

FUS - 40B, closed face and excellent for harsh environmental conditions.

Features:

	High Sensitivity
	Small size and light weight
	Closed face construction for high humidity protection.

Applications:

	Distance measurement
	Monitoring uses for level of substance in a tank
	Automatic door openers and security alarms
	Proximity switches for FA system

Construction and Dimensions:

Type	FUS - 40BT/R T=Transmitter  R=Receiver
Construction	Closed face
Nominal Frequency	40 kHz.
Dimensions

Type	FUS - 40BT Closed type transmitter	FUS - 40BR Closed type receiver
Nominal Frequency	40KHz.
Sound Pressure Level Sensitivity	105 dB min (0dB = 2 X 10 -5 Pa)	-57 dB min (0dB = 1V/Pa)
Bandwidth	2 kHz. min. (100 dB)	2 kHz. min. (-60dB)
Electrostatic Capacity	2600 pF +/- 20%
Radiation Directivity	80 degrees	80 degrees
Max Input Voltage
Operating Temp Range	-20 ~ 70 degrees C
Storage Temp Range	-35 ~ 80 degrees C
Measurement Circuit, Transmitter
Measurement Circuit, Receiver

Environmental Characteristics:

Storage at high temperature	80 deg C, 500 hours	Variation of Sensitivity: within 3 dB
Storage at low temperature	-35 deg C, 500 hours
Durability, humidity	60 deg C, 90 ~ 95% RH, 500 hours
Durability, long operation	60 deg C, 85% RH, 10V rms, 500 hours
Shock	3 drops 1m onto hard wood plate
Vibration	10-55-10 Hz / 1 minute Amplitude 1,5mm X, Y, Z each 1 hour