What is a displacement sensor?

A displacement sensor is also called a linear sensor, from the product category, it is a type of linear metal sensor. The function is to transform the tested physical quantity to electric quantity.

In the real application, the measurement of displacement has two types: one is to measure the material object dimension and the other one is to measure the mechanical displacement.

The classification: according to the way of tested quantity transformation, there are analog displacement sensor and digital displacement sensor.

Electromagnetic displacement sensor

The electromagnetic displacement sensor is used for testing the object’s actual displacement by monitoring the magnetic ring absolute position with non-touch technology. Due to its high precision and reliability, this product is applied in many cases.

The advantages

As the magnetic ring is directly contacted with no sensitive parts, this displacement sensor can be used in some extremely severe environments. The sensor has good resistance to oil, liquid, dust or other pollution elements. The ingress protection rating can be as high as IP67. In addition to these, it can even be used in places of high pressure, high temperature and strong vibration. What’s more, the signal produced by the sensor is absolute displacement quantity, which won’t be lost or reset even there is a power cut or system restart.

Our inductive linear displacement sensor enjoys the following advantages: high reliability, long service life, high resolution, high-frequency response, good repeatability and high-pressure resistance, etc. It doesn’t need sliding contact with the object and it is suitable for hydraulic systems to detect the spool’s position precisely. The technical parameters of these displacement sensors are as the following:

Model Picture Specification Working stroke Temperature range PDF download
IW9-03-01  liner sensor IW9 M27*2 ±4.5mm -20℃~+80℃  


Model Picture Size Displacement measure Temperature range PDF download
GWEF45-004  liner sensor IW9 Φ45mm ±4mm -20℃~+80℃  


Model Picture Plug Measuring stroke Input voltage Output voltage PDF download
GWEF50-015  liner sensor IW9 >M12*1  4-pole ±15mm ±15V ±5V  


The hydraulic resistance and protection proved by enclosures of the three displacement sensors above are as follow:

Model IW9-03-01 GWEF45-004 GWEF50-015
Hydraulic resistance 31.5MPa  31.5MPa 31.5MPa
Protection proved by enclosures  IP65 IP65 IP67


The IWA1341A Series displacement sensor adopts the advanced technology from BSO Company in German. The IWA1341-063A makes great improvements based on the technology and its shell is made of stainless steel.

Model Measuring range (mm) Basic accuracy (%) Linear accuracy (%) Carrier wave (KHz) Resistance (Ω) Coil induction (mH) PDF download
IWA1341-032 ±3.2 ±0.2 ≤0.1 2.5 6.8 1.1  
IWA1341-063 ±6.3 ±0.2 ≤0.1 2.5 11.8 3.7   
IWA1341-063A ±6.3 ±0.2 ≤0.1 2.5 11.8 3.7   


The IW9-03 inductive linear displacement transducer is used in the control circuits of DC 24V together with the measuring amplifier. The movable pole of the sensor causes the inductance change, and the change of inductance feeds back to the amplifier. Then the amplifier transforms the inductance change into the input voltage.

Model Picture Working stroke (mm) Linear precision(%) Repeat precision(%) Carrier wave(KHz) Winding induction (mH) Protection class PDF download
IW9-03  liner sensor IW9 ±4.5 ≤1 ≤1 2.5 6-8 IP65  


The G-MQ position switch is a safety valve displacement sensor with two outputs pin2 / pin4. It monitors spool’s position fast and accurately. The position switch has functions of voltage sure, overload proof, short circuit protection and polarity repeatability, high reliability and long service life.

Model Picture Supply voltage Ub (V) Current consumption (mA) Max output current (mA) Electrified rate Repeatability at 25℃ (mm) Switching point hysteresis (mm) PDF download
G-MQ  liner sensor IW9 24±20%DC ≤40 400 100% ≤0.02 ≤0.05