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Which a few action can solve the rotameter is allowed to?

by:KAIDI     2020-12-24
Rotameter is usually called: & other; Metal tube flow meter & throughout; Metal pipe flow meter is not allowed to do, in use process kaidi instrument equipment factory today and you can take a look at the nine solution! 1, when opening the system pointer property of reasons: medium containing impurities, make the rotor stuck; System working pressure is too small, the instrument is not normal work,. Solution: : removal; Increasing magnetic filter, system working pressure. 2, the cause of pointer header to don't reply: medium containing impurities, make the rotor stuck; Inappropriate instrument selection, selects the meter is too small. Solution: removal, increase magnetic filter; 3, the cause of pointer fluctuation is too big, can't accurate readings, causes: system working pressure is not stable; Medium existence of pulsating flow or dual phase flow phenomenon; Instrument import and export of big diameter change or increase the pressure loss caused by pressure changes. Solution: check their systems; Eliminate the pulsating flow and two phase flow. To reduce the pressure loss. 4, the cause of pointer not back to zero: due to the fluctuation of instrument pointer displacement; Due to the fluctuation impacts, and make the measuring tube bending deformation of parts. Solution: a pointer to the small screws to unscrew the pointer recovery to not working state; Advice to repair or replacement. 5, far eastone inaccurate reason: the environment temperature is beyond work requirements; Transmitter drift. Solution: use as required; Properly adjusting screw to adjust potentiometer in the transmitter or to return to normal. 6, the normal of fluid flow, according to total counter words without increasing: 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 - 3 items were 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. Solution: use 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. 7, not reduce flow operation, but flow showed declining: 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. Solution: 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. 8, fluid flow, flow display is not zero, or unstable display values: shielding grounding, a transmission line interference signals mixed with display input; Pipeline vibration, the impeller jitter, error signal; Cut-off valve closed lax caused by leakage, in fact, the instrument shows leakage; Display the internal circuit board or electronic components between metamorphic damage, interference. Solution: check the shield, display terminals are 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. 9, display and experience value for evaluating value significant difference: sensor circulation channel internal fault, such as fluid corrosion, wear serious, sundry obstacles make impeller rotation disorder, instrument coefficient of leaf is impacted by the corrosion or change, at the top of deformation, affect the normal cutting lines, detecting coil output signal disorders, instrument coefficient changes: the fluid temperature is 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, influence of the reasons of the impeller rotating pipe flow, if not install the check valve in the reverse flow by-pass valve is not locked, with a larger leakage 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. Solution: 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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