YD9300 Low Frequency Vibration Sensor

1、 Basic parameters

● Working power supply

1)Single power supply:+12V～+24Vdc; -12V～-24VdcPower supply, output will be superimposed0.5DC bias with multiple power supply voltage values

2)Dual power supply: ±6V～±15VPower supply, the maximum output voltage is related to the operating voltage

3)Working current ≤15mA

● Frequency response range:0.5Hz～200Hz（-3dB）

● Damping ratio: 0.65±0.05

● Sensitivity: Displacement output type8V/mm±5%vP-P(can be adjusted according to user requirements);

Speed output type20mV/mm/s±5% RMS

● Maximum mechanical amplitude displacement:±3mm

● Nonlinear amplitude: ≤5%

● Horizontal cross influence: ＜5%

● Working temperature: -20℃～+85℃

● Protective features: dustproof, waterproof

● Protection level:IP67Direct cable output can achieve1Immersion within meters of depth

● External dimensions:Φ66×140mm

● Weight (excluding cables) make an appointment420g

The low-end of the frequency response range is the nominal natural frequency value, at which the sensitivity decays to the nominal value0.707（-3dB）The high-end cut-off frequency also refers to-3dBThe frequency response range and sensitivity of the sensor can be changed according to user requirements. The measurement range of sensor vibration displacement is limited by the amplitude of the output voltage and the mechanical position of the oscillator. If the sensitivity is high, the corresponding measurement range is small, and if the sensitivity is low, the measurement range can be increased. The product of the two is equal to the maximum output voltage. For example, when the sensor adopts ±12VThe maximum output voltage during power supply is ±10VIf sensitivity is used8V/mmThe maximum measurement range is ±1.25mmIf sensitivity is used4V/mmThe maximum measurement range is ±2.5mm.

The sensitivity threshold at the low frequency end is limited by device noise0.5HzThe displacement sensor is approximately1µM. The power supply can be as low as ±6VLowering the power supply voltage does not affect sensitivity, but the range decreases accordingly. The output cable can be as long as300mIt does not affect the output characteristics, and user specific performance requirements can be negotiated separately.

1、 Installation method

YD9300Low frequency vibration sensors can be installed vertically or horizontally, avoiding the drawbacks of traditional strict differentiation between vertical and horizontal.

The fixing method generally involves using screws to press the chassis onto the object being measured, or directly connecting the housing to the object being measured using screws. At the bottom of the shell, there areM8Screw hole, can be connected to a magnetic suction cup (can be ordered separately) to attach to the object being measured. If the vibration acceleration does not exceed1gIn temporary experiments, rubber putty can also be used to stick the bottom of the sensor to the object being tested.

2、 Wiring schematic diagram

Aviation plug output

The wiring diagram of the sensor with aviation plug is shown in the figure4.2.

（a）Wiring diagram for positive single power supply type

（b）Negative single power supply type wiring diagram

(c)Dual power supply type wiring diagram

Figure 2YD9300Wiring diagram of low-frequency vibration sensor aviation plug

Cable output (based on physical line standards)

●Positive single power supply wiring:

red---Positive end of power supply

blue---Power supply and negative terminal of output signal

yellow---Output signal positive terminal

●Negative single power supply wiring

red---Positive terminal of power supply and negative terminal of output signal

blue---Power supply and negative terminal of output signal

yellow---Output signal positive terminal

●Dual power supply wiring:

red---Positive end of power supply

white---Common ground for power supply and output signal

yellow---Output signal positive terminal

blue---Negative end of power supply

The output waveform diagram of the cable output is similar to the corresponding output waveform of the aviation plug (see figure2The output waveform diagram in.

Using ordinary ±6V～±12VDC stabilized power supply, with a current of approximately6～13mAWhen using a lower power supply, the sensitivity remains basically unchanged, but the range will correspondingly decrease. Asymmetric error between positive and negative power sources will cause slight changes in output bias, but the sensitivity remains unchanged.

3、 Operation steps and precautions

1Install the sensor on the vibrating object to be tested. When installing vertically, the sensor axis should be installed along the direction of the ground perpendicular line at the location of the vibration to be measured, and the base should be at the bottom and the aviation socket should be at the top. It cannot be installed upside down, as shown in the figure5.1When installing horizontally, the sensor axis should be placed in a horizontal plane (lying down) and aligned with the direction of the vibration to be measured, as shown in the figure5.2.

picture5.1 Vertical installation

picture5.2 Horizontal installation

2Connect the cable plug firmly to the sensor socket.

3Connect the cable connector to ±12VDC stabilized power supply connection. Before connecting the power supply, it is necessary to carefully check and not connect it incorrectly to prevent burning out the sensor!

4The output voltage of the signal line can be connected to electronic oscilloscopes or recorders, computers, etc., and its input impedance is generally required to be greater than1KΩTo avoid excessive load current, although the sensor is equipped with overcurrent protection, efforts should be made to avoid output short circuits. When observing signals with an oscilloscope, it is necessary to use“DC”To avoid the interference of the oscilloscope's DC blocking capacitor on the low-frequency waveform.

5After checking the wiring is correct, turn on the power again. From the analysis of the reasons for sensor damage during use, the vast majority of the reasons are due to incorrect power connections!

6After connecting the power, it is necessary to preheat for a moment (less than)1The measured signal can only be observed in minutes.

7Due to the high sensitivity of sensors, they can sense both the vibrations of the earth and the environmental vibrations of the base. Therefore, even if the object being measured appears to be "stationary", the sensor still has a certain output, which is a normal phenomenon. If two sensors are placed together, it can be observed that their output signals are highly consistent (this method can be used to preliminarily detect whether the sensors are working properly). Sensors also have their own inherent noise, but generally the noise value is much smaller than the output value caused by environmental vibrations.

8When the sensor is powered on, if it is moved or reinstalled due to excessive vibration, the signal will exceed the limit and cause "saturation". After stable installation, it is also necessary to wait for a moment (not exceeding30It can be restored to normal in seconds and put into use.

9Before stopping use, cut off the power first and then perform other operations.

10Sensors do not need to be locked during transportation and do not need to be zeroed during use, but efforts should be made to avoid human dropping.

11If any problems are found, please do not dismantle or repair them without authorization.