[Core Summary] Fluctuations in vibration sensor readings and distortions in 4-20mA signals are mostly caused by poor grounding and installation resonance. By following the four troubleshooting steps outlined in this article, most on-site issues can be quickly identified. Unverified parameters such as sensitivity and range are marked with [Please verify], so please check the nameplate before making any adjustments.
1. First, let's look at the symptoms: is the sensor broken, or is the signal being interfered with
An abnormal reading does not necessarily indicate that the sensor is damaged beyond repair. To avoid unnecessary troubleshooting, it's important to distinguish between two typical phenomena:
1. Random fluctuations and spikes in values, but the device appears to be functioning normally to the naked eye - this is most likely due to interference or grounding issues.
II. Step 1: Check the power supply and 4-20mA loop
The PC420 features a two-wire 4-20mA output, and any abnormalities in loop power supply will be directly reflected in the current.
III. Step 2: Check grounding and shielding
Grounding is a link prone to issues in the vibration monitoring field.
IV. Step 3: Check Installation and Resonance
Improper installation can cause "false vibration" in readings.
V. Step 4: Perform Comparative Verification
1. Replace the sensor with a sensor of the same model at the same location. If the reading returns to normal, it indicates that the original probe is damaged.
Common Phenomenon Comparison Table
Maintenance suggestions
1. Tighten the mounting bolts once every quarter and check the suction force of the magnetic base.
If you require more specific guidance on model selection or installation, please contact the Shanghai Qinuo technical team to verify the parameters.
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