The common causes and solutions for unstable signals and output jumps in contact displacement sensors are as follows:

Common reasons

Power issue

Voltage fluctuation: Unstable power supply voltage or insufficient capacity can cause fluctuations in sensor output signals. For example, when the power capacity is small, adhesive or mold closing movements may cause fluctuations in display values and increase measurement errors.

Power interference: When the electromagnetic valve drive power supply is shared with the sensor power supply, interference may be introduced through the power line, causing signal jumps.

interference problem

High frequency interference: The high-frequency electromagnetic field generated by equipment such as frequency converters and large motors may be coupled to the sensor signal line through spatial radiation or power lines, resulting in irregular jumping of the output signal.

Static interference: Static accumulation may be introduced through the sensor housing or signal line, resulting in brief fluctuations or instability in the displayed values.

Installation issues

Neutral deviation: The sensor is not aligned with the direction of motion of the measured object during installation, resulting in friction or jamming between the iron core and the inner wall of the coil, causing measurement errors.

Loose fixing components: Loose fixing components such as connecting rods and brackets due to lack of tightening or long-term vibration, causing sensor components to shake and affecting signal stability.

Connection issues

Wiring error: Incorrect connection of sensor power line, signal line, and output line may result in large linear error, poor control accuracy, and even damage to the sensor.

Line aging: Signal line insulation damage or contact with machine casing may cause a short circuit to ground, leading to abnormal signals.

treatment method

stable power supply

Use a regulated power supply or increase the power capacity to ensure that voltage fluctuations are within the allowable range (such as ± 0.1%).

Avoid sharing the power supply for solenoid valve drive and sensor power supply, and use isolation transformers if necessary.

reduce interference

Shielding and grounding: Use shielded wires for signal lines and ensure that one end of the shielding layer is grounded; The sensor housing is in good contact with the equipment through a grounding bracket.

Isolation of interference sources: Keep the sensor away from interference sources such as frequency converters and large motors, or install isolation barriers.

Standardized installation

Re calibrate the sensor position to ensure that it is parallel to the direction of motion of the object being measured, and that the iron core can move freely within the bore.

Regularly inspect and tighten fixed components such as connecting rods and brackets to prevent loosening.

Check the connection

Check the sensor wiring diagram to ensure that the power line, signal line, and output line are connected correctly.

Check the insulation condition of the signal line and replace aging or damaged circuits in a timely manner.