One PT display shows zero while there is no pressure. But the controller shows 12.5% of the range and the mA reading is also 6 mA. When connected to HART, it doesn’t establish communication with HART. when the pressure is increased to at least 12% of the range, the communication establishes. When the pressure is lower than that, it loses the communication again. What could be the possible cause and what could be done to solve?
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