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If the transmitter signal is used for controlling, then put the controller on manual.
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Connect a digital multimeter in the current range in series with the transmitter output.
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Isolate the process valve
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Isolate the instrument isolation valve.
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Open the equalising valve
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Open the bleed valve and de-pressurise the transmitter.
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Check for 4.00mA output signal, if not, adjust the zero screw.