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 integrated structure，it offers excellent durability and environmental resistance，with an operating temperature range of -20 ℃~120℃。The differential transformer consists of a primary coil，secondary coils and a movable iron core. A sine-wave excitation with a certain voltage and frequency is applied to the primary coil. Through the movable iron core，an induced voltage is generated in the secondary coils，and its output characteristicisthat the differential output of the two secondary coils is an AC voltage at 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 reaches 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 integrallyencapsulatedin a stainless steel housing. Input voltage12VDC～24VDC，output signals±5V、0～5V、0～10V or 0～10mA、04～20mA signals，and it can be used with a four-and-a-half-digit digital display meter. During use，simply clamp the sensor housing onto the reference object，and place the tip of its measuring rod（or clamp）on the measured point，then the relative displacement between objects can be measured directly.Features：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）；⑤There is zero-position output voltage 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 adopts 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 or 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 are highly corrosive to metals.

3.The movement 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.When installing and using the sensor，handle it with care，avoid knocking and dropping，and the fixture should be fixed at both ends of the sensor. Do not apply excessive force，and do not allow dents or deformation of the housing that may affect the measuring range. Please do not use it beyond the measuring range.

5.Please power on the sensor and preheat it for 5 minutes before formal measurement and use.

6.The displacement sensor is a precision instrument，and it 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 been mainly engaged in the R&D and production of pressure，liquid level，temperature，differential pressure，digital display，weighing and flow instruments.Main products include Swiss metallux ceramic piezoresistive sensors，self-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-proof 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/thermal resistances temperature transmitters ultrasonic level meters

Precautions 1.All supplied products come with a product certificate and instruction manual，which include the product number，technical parameters，wiring diagram，factory date，etc. Please check them carefully to avoid incorrect use.2.Wiring should be carried out strictly in accordance with our company's operating instructions.3.This product is a precision instrument. Arbitrary disassembly，impact，dropping，or poking the sensor with sharp tools is prohibited.4.The transmitter can work after being powered on，but the output will be stable after preheating for 30 minutes.5.If any abnormality is found during use，turn off the power，stop using it，inspect it，or contact our company's technical department directly.6.During transportation and storage，restore the original packaging and store it 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 and are not eligible for 7-day no-reason returns. Customized products have a lead time and cannot be returned or exchanged.