How can the issues that arise during sensor installation be resolved?
Release Time:
2025-11-01
In the measurement of air compressor discharge pressure, the discharge pressure signal exhibits significant fluctuations. After verifying the two-dimensional force sensor, it was found to meet the required accuracy, ruling out any inherent issues with the transmitter itself. Additionally, inspection of the impulse lines and connectors revealed no damage or air leaks, and the connections of the signal cables were confirmed to be in good contact. However, the cable routing passes through the cable tray adjacent to the high-voltage switchgear room before entering the control room—making it particularly susceptible to substantial electromagnetic interference. As a result, during pressure measurements, the indicated pressure sometimes fails to respond appropriately to changes in operating conditions. Moreover, even after opening the drain valve, only a small amount of wastewater flows initially; subsequently, no further water emerges. This phenomenon occurs because the water quality—or rather, the compressed air—contains trace amounts of airborne dust particles, which gradually settle inside the impulse lines as they are carried along by the flow. Over time, continuous operation leads to corrosion and scaling on the inner walls of the impulse lines, ultimately causing blockages.
In steam flow measurement, steam primarily comes in two forms: external supply steam and superheated steam generated by the boiler. External supply steam is steam that has undergone temperature and pressure reduction; it features relatively low temperature, high moisture content, and is used only when needed—its flow rate fluctuates constantly based on user demands. In practical flow measurement scenarios, the measured flow often becomes either too high or too low, resulting in significant instability. As a result, regular purging becomes necessary. Interestingly, after each purge, the transmitter readings regain accuracy. However, frequent purging of the steam pipeline can easily lead to steam leakage at various connection points along the impulse lines. When measuring superheated steam, another issue arises: sometimes, after shutting down and restarting the system, the flow reading becomes inaccurate, causing calibration errors. Additionally, even after shutdown, a small residual flow may still be displayed. Typically, transmitters are installed below the measurement pipeline. Yet, in actual installations, both the condensate tank for external supply steam flow and the transmitter itself are positioned higher than the measurement pipeline. Moreover, the impulse line extending downward from the throttling device—installed at least 1 meter long—is also excessively short.
Check whether the transmitter's power supply is connected with reversed polarity; measure the transmitter's power supply to ensure a stable 24V DC voltage output. If the transmitter comes equipped with a meter head, verify that the meter head itself isn’t damaged (you can first short-circuit its two wires—if it functions normally after shorting, the meter head is likely faulty). Also, confirm that the power supply is properly connected to the transmitter’s input terminals. Next, connect an ammeter in series within the 24V power circuit to verify that the current reading is within the expected range. Finally, make sure the power polarity is correctly aligned. It’s crucial to ensure that the voltage supplied to the transmitter meets or exceeds 12V (i.e., the voltage at the transmitter’s power input terminals must be ≥12V). If no power is detected, inspect the circuit for open connections and double-check that the selected measuring instrument has the correct input impedance (which should be ≤250Ω). If the meter head is found to be damaged, replace it immediately. If the meter head checks out fine, this confirms that the transmitter itself is functioning properly. At this point, proceed to examine whether any other instruments in the circuit are operating as expected. Lastly, securely connect the power cable to the designated power terminal block.
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