common faults and processing method 1, the normal of fluid flow, according to the total counter of no increase.
Possible reasons: 1)
Check the power cord, fuse, function selection switch and signal lines have break or poor contact;
Check the internal display, print, contact elements such as presence of poor contact;
Check the detection coil;
Check the internal fault of sensor and the 1)
Tests have confirmed normal or has ruled out fault, fault phenomena, but there are still to show that the fault sensors inside circulation channel, can check whether the impeller touch sensor inside, presence of foreign bodies stuck, shaft and bearing have sundry jam or fracture phenomenon.
With the ohmmeter screening point of failure;
Fault check printing plate can be used to replace & other;
Alternate version & throughout;
Method, for fault board again careful check;
Completes the detection coil in the sensor location mark in the table body, unscrew the detection head, use iron under the detection head moving fast, if the counter does not increase, should check whether there is any break on the coil and the solder joint sealing off;
Remove foreign bodies, and clean or replace the damaged parts, after his recovery, blowing or hand toggle impeller should be frictionless, should check again after changing the spare parts such as bearings, new instrument coefficient are obtained.
2, not reduce flow operation, but declining flow display.
Possible reasons: in the following order to check 1)
Filter blockage, if the filter differential pressure increases, that stuff has been blocked;
Valve on the flow sensor section appears loose valve core, valve opening automatically reduce;
Sensor impeller by sundry obstacles or bearing clearance to enter foreign body, slow resistance increases with the reduction.
Remove the filter;
From the effective judgment, whether the valve handwheel adjustment confirm again after repair or replacement;
Unload sensor to clear, if necessary, check again.
3, fluid flow, flow display is not zero, or unstable display values.
Possible reasons: 1)
Shielding grounding, a transmission line interference signals mixed with display input;
Pipeline vibration, the impeller jitter, error signal;
Globe valve closed lax caused by leakage, in fact, the instrument shows leakage;
Display the internal circuit board or electronic components between metamorphic damage, interference treatment.
Check the shield, display terminal whether good grounding;
Before and after reinforcement line, or in the sensor support to help them avoid vibration;
Repair or replace the valve;
Take & other;
Short-circuit method & throughout;
Or item by item, check them one by one, judge the interference source, find out the point of failure.
4, display and experience value evaluation have significant value.
Possible reasons: 1)
Sensor circulation channel internal fault, such as fluid corrosion, wear serious, sundry obstacles make impeller rotation disorder, instrument coefficient change.
Blade corrosion or shock, deformation at the top, affect the normal cutting lines, detecting coil output signal disorders, instrument coefficient change;
Fluid temperature too high or too low, shaft and bearing expansion or contraction, too much clearance changes bring an aberration of the impeller rotating instrument coefficient change;
Back pressure sensor is insufficient, a air-pocket, affect the impeller rotation;
Pipe flow reasons, if not install the check valve in the reverse flow, bypass valve is not locked, for leaks.
A larger sensors upstream velocity distribution distortion (
As a result of upstream valve fully open)
Or pulsed liquid viscosity caused by temperature change is bigger, etc;
Display internal fault;
Detector in the permanent magnetic material and element aging excitation-loss, magnetic weakened to a certain extent will affect the measured values;
Sensor through the actual flow it is more than the flow range specified by the sensor.
Find out the cause of the problem, in view of the specific reasons for countermeasures;
Replace the excitation-loss components;
Replacement of appropriate sensors.
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