The quality of the electromagnetic flowmeter's acceptance will directly affect its future use and even affect the normal operation of the entire working condition.
The quality of the electromagnetic flowmeter's acceptance will directly affect its future use and even affect the normal operation of the entire working condition. Therefore, on-site acceptance and debugging are the basic abilities that every instrument worker must have. Do your job well and Learn skills and apply them to work practice.
The acceptance phase generally involves inspecting sensors, converters and connecting cables. The sensor can be measured according to the empty pipe condition: electrode insulation performance; excitation coil resistance and insulation performance; check the soundness of the lining material; for converter detection, an analog signal generator should be used. Do not check the converter output after connecting the converter to the sensor. , because the control is empty at this time, the output information and display information are in a random state). For connecting cable detection, mainly check whether the cable model and length meet the requirements.
Initial assembly and debugging of electromagnetic flowmeter:
1. Focus on the following analysis and inspection;
2. Whether the operating conditions of the instrument meet the requirements (humidity , pressure, flow rate, protection level);
3. Whether the instrument selection is correct;
4. Whether the instrument installation is reasonable (grounding, front and rear straight pipe sections, wiring), taboo five-center installation Method: ① Gas accumulation point - bubble accumulation should be avoided; ② Non-full pipe - ensure full pipe status during measurement; ③ Siphon port - siphon phenomenon cannot occur; ④ Pre-valve - the regulating valve should be installed downstream of the flow meter ; ⑤ Back pump - install a pump upstream to eliminate negative pressure. External interference introduced by the connecting cable should also be considered, and the fault of the instrument itself cannot be ruled out;
5. After powering on, the zero point must be adjusted when the electromagnetic flow sensor is filled with liquid and is at rest.
6. Regularly stop the flow for zero point inspection according to the usage conditions:
7. Sensor electrode wear, corrosion, leakage, and scaling. Especially for non-cleaning liquids that precipitate, easily contaminate electrodes, and contain solid phases;
8. The insulation of the excitation coil decreases;
9. The insulation of the converter decreases;
10. Converter circuit failure;
11. The connecting cable is damaged, short-circuited, or damp;
12. New changes in the instrument’s operating conditions cannot be ruled out.
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