English 
█ SCOPE
This specification includes 200F18TR-4A ultrasonic sensor size, characteristics, performance parameters and precautions, before using this product, please read this specification. 200F18TR-4A has the functions of transmitter and receiver. It generally can be used for roll diameter, tension control, ultrasonic sensor for non-contact detect objects, ultrasonic distance sensor, ultrasonic automation control, ultrasonic liquid level sensor, etc. If you have any questions for other applications, please contact us for details.
█ OUTLINE DIMENSION
█ CHARACTERISTICS
Part Number | 200F18TR-4A |
Nominal Frequency | 200.0±10%KHz |
Test board | 100mm x 100mm |
Voltage | 10～30VDC |
Distance of Detection | 0.06～1.0m (Adjustable) |
Directivity | 7°±2°(-6dB) |
Output | 4~20mA |
Operating Temperature | -20℃～+60℃ |
Storage Temperature | -40℃～+70℃ |
Protection degree | IP67 |
Material of Cover | Metal |
█ CONNECT PINS
█ PRINCIPLE AND APPLICATION OF ULTRASONIC SENSOR
Ultrasonic Ranging Principle The principle of ultrasonic ranging is to use the propagation speed of ultrasonic waves in the air to be known. The time when the acoustic wave is reflected by the obstacle after the launch is measured, and the emission point to the obstacle is calculated according to the time difference between the transmitting and receiving. Actual distance. First, the ultrasonic transmitter emits ultrasonic waves in a certain direction, and starts timing at the same time as the transmission time. The ultrasonic waves propagate in the air, and immediately return to the obstacle when the obstacle is encountered, and the ultrasonic receiver stops timing immediately upon receiving the reflected wave. The propagation speed of the ultrasonic wave in the air is C=340 m/s. According to the time T seconds recorded by the timer, the distance L of the emission point from the obstacle can be calculated, that is, L=C×T /2 . This is called the time difference ranging method.
Since ultrasonic waves are also sound waves, the speed of sound C is related to temperature. the sound velocities at several different temperatures. In use, if the temperature does not change much, the speed of sound can be considered to be substantially constant. If the accuracy of the distance measurement is very high, it should be corrected by the method of temperature compensation.