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1. What could be the cause of inaccurate display of the e h mass flow meter?
Common causes and solutions of inaccurate display of the mass flow meter
1. Sensor problem • Zero drift: After long-term use, the sensor zero point shifts and needs to be calibrated according to the instructions • Measurement tube blockage: caused by residual or crystallized media, requiring shutdown for cleaning (corrosive media require special cleaning agents) • Coil/electrode damage: Use a multimeter to detect the coil resistance (normal value refers to the equipment manual, usually 5-50 Ω). 2 Abnormal installation and working conditions • Vibration interference: When the installation position is close to the pump/compressor, a shock absorber bracket needs to be installed • Medium gasification: caused by insufficient downstream pressure of the flowmeter, it is necessary to ensure that the back pressure is greater than 1.5 times the saturated vapor pressure of the medium • Pipeline stress: Incorrect flange installation will introduce errors, and the concentricity of the pipeline needs to be recalibrated Signal processing fault • Wiring measurement error: Check the polarity of the 24V power supply (some models may burn the circuit board if reversed) • Electromagnetic interference: When the signal line is laid parallel to the power line, shielded cables need to be used and separately threaded through pipes • Converter fault: There is a difference between the original signal (such as frequency output) of the blocking ratio sensor and the displayed value. 4 Changes in medium characteristics • Density/viscosity beyond the range: check if the medium parameters match the calibration range of the flow meter • Two phase flow: when gas
2. How to repair EH mass flow meter display values that are too small?
The core maintenance idea for EH mass flow meter display values that are too small is to follow from the outside to the inside, from simple to easy. The tedious sequence of troubleshooting is usually caused by sensor attachments, installation stress, and electrical connection issues. 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 tr