Temperature fluctuation issue with E+H servo level gauge
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Our factory uses E+H servo level gauges to measure the liquid level in liquefied gas tanks. Some time ago, during maintenance, the float was lifted; after closing the isolation ball valve, the power supply was cut off. Once the work was completed and power was restored, the liquid level indicated by the float was normal, but the temperature reading (provided by the thermistor) kept fluctuating. Sometimes it would rise to over 300 degrees, while at other times it would drop to around -20 degrees. At first, we thought that the temperature conversion module of the level gauge was damaged, so we had a new module supplied by the manufacturer, but the problem persisted. We then connected an inline thermistor directly to the level gauge’s display, but the fluctuations continued. Could someone please help me understand what’s going on? Everything was working fine before the power outage for maintenance. Thank you
Are the thermocouples with similar characteristics subject to large fluctuations? If it doesn’t send out, check if there’s a problem with the cabinet room Is it possible to find a place where the medium temperature can be measured using 316?
Is your servo connected via HART to multiple average temperature sensors, or is it connected by a direct wire to a single temperature sensor?
A single thermal resistor is connected via a hard wire to the servo
Is there any record of a temperature fault in the servo level gauge’s own alarm history?
I hadn’t noticed this yet. Is there any particular way to phrase it? Report fault or do not report fault
This post was last edited by tiger2010 on 2017-2-11 08:39. Of course, there is an explanation for this: the temperature sensing element is connected to the transmitter terminal box of the servo level gauge. If the servo level gauge detects a fault with the temperature sensing element, it will definitely generate a fault signal. Historical temperature alarms that were not actual alarms are not cleared; it is unclear whether this has any impact on temperature output. It would be better if such historical temperature alarms (which were actually no alarms) were also cleared