『Flow meter maintenance』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. How to repair if the display value of EH mass flowmeter is too small?
If the display value of EH mass flowmeter is too small, the core maintenance idea is to follow the sequence of troubleshooting from external to internal, from simple to complicated, usually caused by sensor attachments, installation stress, and electrical connection problems. 1. Preliminary inspection and external factor investigation: ① Check the state of the medium and zero point calibration • Medium gasification: Confirm that the pipeline insulation and heat tracing are normal to prevent inaccurate measurement values caused by liquid medium gasification. Online zero calibration: Perform online zero calibration to eliminate sensor drift errors while ensuring that the flowmeter is filled with a single medium and completely stationary. ② Check installation and pipeline stress • Installation direction: Ensure that the installation direction of the flowmeter is consistent with the fluid direction indicated by the arrow on the housing. Pipeline stress: Check whether the pipeline supports on both sides of the flowmeter flange are firm to avoid external stress twisting the measuring tube. ③ Check electrical connections and signal transmission • Cable inspection: Check whether the signal cable is intact, whether the shielding layer is single point grounded, and eliminate electromagnetic interference. • Wiring terminals: Tighten the wiring between the sensor and transmitter terminals, check for oxidation or looseness
2. Diagnosis of the sensor section ① Check for adhesion and scaling of the measuring tube • Internal scaling: Check if the process medium is prone to crystallization or scaling, as attachments can alter the vibration character
3. Transmitter part and parameter settings • Configuration parameter check: Check whether the instrument coefficient, density, flow unit and other parameters set in the transmitter are correct and whether they have been modified incorrectly. Output mode: Confirm whether the flow output is set to mass flow or volume flow to avoid setting errors. • 4-20mA output calibration: Check if the current output value of the transmitter matches the displayed flow rate, and recalibrate if necessary.
4. Professional recommendations for hazardous operations. • Internal maintenance (such as cleaning measuring tubes and replacing coils) must be carried out by professionals after emptying, replacing, isolating, and confirming safety in the process pipeline. Pressure operation is strictly prohibited. If the above troubleshooting does not solve the problem, it may be an internal fault of the sensor. It is recommended to contact the equipment manufacturer or a professional maintenance organization for factory inspection and repair.
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