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magnetrol displacer control valves

magnetrol displacer control valves

magnetrol displacer control valves

(OP)
We use a magnitrol level controller on one of our hydrocarbon knock out vessels. It seems when the ambiant temperature gets lower than 0C the valve won't operate properly. The displacer float cage is clean, so does the cold ambiant temperature have an effect on the magnet itself causing it not work?

RE: magnetrol displacer control valves

Have you checked the dew point of your instrument air? I am guessing that you are freezing in your I/A line, regulator, actuator?

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RE: magnetrol displacer control valves

(OP)
The rest of our control valves work fine so I dont think thats the problem.

RE: magnetrol displacer control valves


Is there a possibility of a rubbing interaction between the float and the chamber at lower temperatures ? Rubbing might bring about the transferring of magnetic properties to the non-magnetic metal of the chamber guide resulting in wrong level signals.  

RE: magnetrol displacer control valves

Hope You have a displacer type level instrument ,a level controller at DCS for level control  and a control valve on line.

It can be a problem at low ampient Temperature ( It happenes very rarely )
1. with electronics circutry of level controller or
2. with electronic circuite of i/p convertor(or     
     Electropneumatic positioner.)
Is there any control scripts (Related to other Plant variables )are assosciated with this controller in System ?.

Instrument1717

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