MEMS Inclinometer

SSM25385-19 Motion Displacement Sensor

    . Axis: 2 axis
    . Linear range:±1.2m
    . Accuracy: ≤±3cm
    . Resolution: 1mm



l  Online monitoring motion displacement detection, mm-level resolution

l  Ultra low frequency 0.15~20Hz

l  Displacement measurement range±1.2m

l  3V/m sensitivity, +12VDC power input

l  The signal can effectively transmit 200m

l  IP67 Protection




Wind turbine online motion monitoring


Working principle


When the sensitive parts are acted on by external force (displacement), the pendulum mass M deviates from the original equilibrium position to produce a small relative displacement, which is detected by the differential displacement detector C with high sensitivity, and the output is After the voltage change proportional to the relative displacement is amplified by the servo amplifier S, the proportional feedback amplifier P, the differential amplifier D and the integrating amplifier I are directly input into the driving coil connected to the pendulum with the driving current In to generate a strong electromagnetic feedback back to zero torque, When external displacement or force occurs, the pendulum always remains at the original zero position, and the feedback current required to maintain the zero position is used to detect the magnitude of the vibration and provide the output, which is called the principle of force balance. For this reason, as long as the electrical parameters of the integrated feedback circuit of the system are adjusted, the natural period and damping coefficient can be changed to achieve a response frequency of 0.15~20Hz and ultra-low frequency motion displacement detection of mm level, without being affected by the external climate and environment.












Power supply


Output Voltage (Linear)

±3.6V@Linear range±1.2m

Output impedance


Input resistance

>1MΩ(Interface device side)


5 core M12 plug


Measurement   range

X+Y dual axis,Linear range:±1.2m










Working   temperature


Working   humidity





2grms,20~200Hz,half sine

Storage   temperature




Insulation   resistance

Insulation resistance to ground100MΩ@(DC250V+85℃)

Power   frequency voltage withstand capability

Equivalent AC1500V test voltage to ground for 1min,   no breakdown, no arcing

Electrostatic   discharge immunity

GB/T   17626.22006 Harsh Level 3 under Chapter 5

Radiated   Immunity to Radio Frequency Electromagnetic Fields

GB/T   17626.32006 Harsh Level 3 under Chapter 5.1

Electrical   fast transient burst immunity

GB/T   17626.42008 Harsh Level 4 under Chapter 5

Surge   (shock) immunity

GB/T   17626.52008 Harsh Level 3 under Chapter 5

Conducted disturbance   immunity

GB/T   17626.62008 Harsh Level 3 under Chapter 5

Ring wave   immunity

GBT   17626.122013 Harsh Level 3 under Chapter 5

Vibration   Response and Durability

GB/T   112872000 Harsh Level I under Chapter 3.2.1

Shell   protection

GB   4208-2008 IP6X standard

Low   temperature performance

GB/T   2423.1“test A,2h

High  temperature performance

GB/T   2423.1“testA,2h

Moisture   and heat resistance

Onshore wind powerGB/T 2423.3“test Cb”

Offshore Wind PowerGB/T 2423.42008 method 1

Salt spray   resistance


Mildew   resistance

GB/T   2423.162008 test 1


Continuous running time should not be less than 72h

Drop   suitability of shipping packages

GB/T   4857.2 Table 1 in condition 5 stipulates that pretreatment is carried out for   4 h, and the drop is carried out according to the specified value in 5.15   table 2



Installation and connection

1、 Notification before installation

Before installing the motion displacement sensor SSM25385-19,  please pay attention to the following information

   The sensor needs to be installed parallel to the surface of the measured surface or on the base bracket



   The sensitive axis of the sensor should be parallel or coincident with the displacement direction of the measured surface

   The axial definition of the sensor is shown in the figure on the right. 

2、 Installation

The sensor can be installed in a variety of ways. When the vibration signal frequency is low and the vibration is not severe, it can be fixed with plasticine; when it needs to be rigidly connected to the measured structure, it can be fixed with glue (such as AB glue) or bolted , There are mounting threaded holes on the bottom of the sensor, which can be fixed with 4 piece M6 bolts.

3、 Selection of installation plane

The installation plane should be as rigid, hard and smooth as possible, the base of the sensor should be in rigid contact with the installation plane as much as possible, and the installation plane should be selected as far as possible at the center of mass of the measured target to reduce the disturbance of dynamic acceleration.

4、 Notification of installation

After selecting the installation position, if you choose bolt installation, drill the installation holes on the installation plane according to the installation hole size of the sensor, and use the correct size screws with spring washers to firmly fix the sensor on the installation plane of the measured target.

Pay attention to the following points when installing:

1) Tighten the screws evenly in turn to avoid excessive mechanical stress causing the installation bottom surface to deform and cause installation errors;

2) Try to ensure that the installation base is level to reduce the measurement error caused by the uneven installation base of the sensor;

5、 Electrical connection

The sensor has a 5-core M12 connector, which can be connected to a 12VDC power supply, and the voltage can be output to the acquisition device. 



Wire color




Power + 12V



Power gnd



Ssignal GND



X-direction output voltage (   positive)



Y-direction output voltage (positive)

6.The use of motion displacement sensor

6.1 UseThe sensor is directly connected to the power supply and acquisition equipment, and can directly measure the displacement without any debugging.

6.2 Matching with the data acquisition system: Users can connect and connect various high-precision data acquisition and analyzers. When connecting, pay attention to the ground of the data acquisition equipment and the ground of the sensor to avoid crosstalk. Before using the instrument, the user should read the instruction manual of the data acquisition system used. At present, most of the acquisition devices require the measured parameters (displacement), dimension (m) and the sensitivity coefficient of the sensor to be input into the system when used. In the results of time domain analysis or frequency domain analysis, it is automatically converted to real physical quantities.

6.3 Displacement conversion method

The method of converting the collected voltage to displacement: the collected voltage of each channel is divided by the sensitivity of each channel to obtain the data of displacement dimension. For the sensitivity of each channel, please refer to the product factory test calibration report.

The user can directly obtain the corresponding displacement data by inputting the sensitivity data according to the sensitivity test calibration report data provided by the sensor when it leaves the factory, combined with the software usage method of the data acquisition.



Ordering information




The motion displacement sensor




2m cable(the length could   be customized),with plug