1、Working principle of differential transformer displacement sensor：

A differential transformer is a sensor that converts linear displacement into analog voltage。Because it is constructed as an integral structure，it offers excellent durability and environmental resistance，with an operating temperature range of -20 ℃~120℃。A differential transformer consists of a primary coil，secondary coils，and a movable iron core。A sinusoidal excitation with a certain voltage and frequency is applied to the primary coil，and the movable iron core causes an induced voltage to be generated in the secondary coils。Its output characteristicisthat the differential output of the two secondary coils is an AC voltage with the same frequency as the excitation signal，which is converted by the detection circuit into a DC displacement voltage for output。The detection circuit consists of rectifier diodes and anRC filter。The measuring range is the travel of the movable iron core，generally from several +mm to several hundred mm。When the movable iron core is at the center position，the output voltage is 0V：when it moves left or right，positive and negative voltages proportional to the displacement distance are generated。Its linearity is less than 1％，and the detection accuracy can reach several μ m；when the specified travel is exceeded，the error increases。

2、Applications and features： 

The differential transformer displacement sensor has good environmental adaptability and is widely used to measure various physical quantities that have been converted into displacement in advance，as well as mechanical quantities that can be converted into displacement changes（such as tension，pressure，vibration，liquid level，etc。）。The sensor'samplifier circuit adopts microelectronic technology，and is integrally encapsulatedin a stainless steel housing。Input voltage 12VDC～24VDC，output signals ±5V、0～5V、0～10V or 0～10mA、04～20mA signals，and it can be used with a 4½-digit digital display meter。During use，simply clamp the sensor housing to the reference object，and place the tip of its measuring rod（or clamp it）at the point to be measured，then the relative displacement between objects can be measured directly。Features are：①No moving contacts，high reliability，long service life；②High resolution and good sensitivity；③High linearity and good repeatability；④Wide measuring range（when the measuring range is large，the resolution is low）；⑤Zero-position output voltage exists when there is no input，causing measurement error；⑥High requirements for the frequency and amplitude stability of the excitation power supply，not suitable for high-frequency dynamic measurement。

3、Precautions：

1. Although the circuit uses internal power supply protection measures，users are still requested to check it before turning on the power。Do not exceed the rated voltage value，so as not to affect measurement accuracy and cause unnecessary losses。

2. The installation position of the sensor should not be close to strong magnetic fields。Unless otherwise specified，the sensor must not be used in environments that strongly corrode metals。

3.The motion trajectory of the measured point should preferably be parallel to the axis of the sensor measuring rod。In this way，the measurement result is the displacement。If the sensor probe moves，the contact surface between the probe and the measured object should not be uneven。

4.Handle the sensor gently during installation and use，avoid knocking and dropping。The fixture should be fixed at both ends of the sensor；do not apply excessive force，and never allow the housing to become dented or deformed，which may affect the measuring range。Please do not use it beyond the measuring range。

5.Please power on the sensor and warm it up for 5 minutes before formal measurement and use。

6.The displacement sensor is a precision instrument and has been calibrated and aged before leaving the factory。Users must not disassemble it at will，otherwise measurement accuracy may be affected and the sensor may be damaged。

Since its establishment，Xi'an Shenghongchuang Instrument Co.，Ltd. has mainly engaged in the R&D and production of pressure，liquid level，temperature，differential pressure，digital display，weighing，and flow instruments。Main products，Swiss metallux ceramic piezoresistive sensors，independently developed ceramic capacitive pressure sensors。Diffused silicon，ceramic piezoresistive，strain gauge，metal capacitive，ceramic capacitive pressure transmitters remote pressure transmitters high-temperature pressure transmitters flush diaphragm pressure transmitters anti-corrosion pressure transmitters integrated/separate liquid level transmitters anti-corrosion liquid level transmitters lightning-protection liquid level transmitters high-temperature pressure-guided liquid level transmitters straight-rod liquid level transmitters flange liquid level transmitters wind pressure transmitters metal capacitive differential pressure transmitters diffused silicon differential pressure transmitters pressure controllers thermocouples/RTDs temperature transmitters ultrasonic level meters

Precautions 1.All supplied products come with a product certificate and instruction manual，including product number，technical parameters，wiring diagram，factory date，etc.，please check carefully to avoid incorrect use。2.Wiring should be carried out strictly in accordance with our company's instruction manual。3.This product is a precision instrument；random disassembly，impact，dropping，or poking the sensor with sharp tools is prohibited。4.The transmitter can work after being powered on，but the output becomes stable after warming up for 30 minutes。5.If any abnormality is found during use，turn off the power，stop using it，inspect it，or directly contact our company's technical department。6.During transportation and storage，the original packaging should be restored，and the product should be stored in a cool，dry，and ventilated warehouse。7.The quality warranty period is 12 months（damage caused by improper use such as pressure overload，incorrect wiring，etc. is not covered by the quality warranty）。8.Special products are customized products，do not participate in 7-day no-reason return，customized products have a lead time，and are non-returnable and non-exchangeable。