1、Operating Principle of Differential Transformer Displacement Sensor：

A differential transformer is a sensor that converts linear displacement into an analog voltage. Because it is designed 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 specified voltage and frequency is applied to the primary coil. The movable iron core causes induced voltage to be generated in the secondary coils，and its output characteristic is that 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 an RC filter. The measurement 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 or negative voltage proportional to the moving distance is 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 first been converted into displacement，as well as mechanical quantities that can be converted into displacement changes（such as tension，pressure，vibration，liquid level，etc.）.The sensor's amplification circuit adopts microelectronic technology，and the whole unit is encapsulated in a stainless steel housing. Input voltage 12VDC～24VDC，output signals ±5V、0～5V、0～10V or 0～10mA、04～20mA，and it can be used together with a 4½-digit digital display meter. During use，simply clamp the sensor housing onto the reference object，and place the measuring rod tip（or clamp it）on the measured point，then the relative displacement between objects can be measured directly.Features are：① No moving contacts，high reliability，long service life；② High resolution and good sensitivity；③ High linearity and good repeatability；④ Wide measuring range（when the measuring range is large，the resolution is low）；⑤ Zero-position output voltage exists when there is no input，causing measurement error；⑥ High 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 switching 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 a strong magnetic field. Unless otherwise specified，the sensor must not be used in environments that strongly corrode 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 gently，avoid knocking and dropping，and the clamps 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. It has been calibrated and aged before leaving the factory. Users must not disassemble it at will，otherwise measurement accuracy will 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 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/RTDs，temperature transmitters，ultrasonic level meters

Precautions 1.All supplied products come with a product certificate and instruction manual，which include 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 operating instructions.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 will be stable after preheating for 30 minutes.5.If any abnormality is found during use，turn off the power，stop using it，perform inspection，or contact our technical department directly.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 and are not eligible for 7-day no-reason returns. Customized products have a lead time and are non-returnable and non-exchangeable.