Today we got an alarm G/E 2 H.T. C.F.W in press IFL on fresh cooling water pressure on auxiliary engine No.2 (which was not in work). In this article, I propose to figure out what kind of alarm this is and how to fix the problem.
First of all, let's turn to the instructions to understand what IFL alarm is. According to the instructions, IFL alarm is an alarm based on a low value of the input signal; if the pressure transmitter transmits a signal below 4 mA, then this alarm appears.
Thermocouple meters convert applied current (a-c or d-c) by thermoelectric effects into deflection currents which register on a PM moving-coil couple actuated by heat generated at the junction formed by two strips of dissimilar metal. One strip carries the heat-generating input currents, the other carries heat-produced currents to the meter movement.
Thermocouple meters are used to measure a wide range of either a-c or d-c currents and give an accurate picture of the effective, or heats producting, value of a current no matter what its nature. The meters are relatively expensive and the thermal delay in converting input electricity to heat makes them sluggish.
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