1. Pre-Power-On Check: Confirm that the wiring is correct, the power supply voltage meets specifications (e.g., DC 12–24V), the polarity is correct, and the safety barrier is correctly connected to the intrinsically safe circuit. Use a multimeter to check the insulation and continuity of the circuit to prevent short circuits or grounding faults.
2. Initial State Test: After powering on, observe whether the sensor indicator light (if present) illuminates normally, indicating that the power supply is connected and the internal circuit is working properly. If there is no response, first check the power supply and wiring.
3. Functional Simulation Test:
Use a standard detection object (such as an iron sheet, magnet, or liquid container, depending on the sensor type) to slowly approach and move away from the sensing surface within the nominal detection distance.
Observe the output signal changes: Use a multimeter to measure the voltage of the output terminal to ground. For NPN type, it should be low (close to 0V) when there is a target and high (close to +V) when there is no target; for PNP type, it is the opposite.
4. Fine-tuning of Detection Distance
Gradually adjust the distance between the sensor and the object being measured to find the actual trigger point and compare it with the nominal detection distance Sn.
It is recommended to set the working distance to 0.6–0.8Sn, leaving a safety margin to avoid misjudgments due to temperature drift or vibration.
5. Anti-interference Test
With the equipment running, start nearby frequency converters, motors, or welding equipment and observe whether the sensor experiences signal jitter or loss. If interference exists, check whether the shielding cable is grounded and whether the signal cable is wired separately from the power cable.
6. System Integration and Verification
Connect the sensor to the PLC or control system and simulate a scene where an object passes through under real working conditions to confirm that the control logic response is timely and accurate, without delay or false triggering.
7. Environmental Adaptability Test (Optional)
If used in high-temperature, humid, or dusty environments, a short-term operational test can be conducted in the later stages of commissioning to observe signal stability and enclosure sealing to ensure the IP protection rating is effective.
8. Recording and Calibration: Record debugging parameters (such as actual trigger distance, voltage value, and load type) for easy maintenance and fault comparison later. For high-precision applications, periodic re-inspection is recommended.
