Answer Posted / haridass

DP Transmitter are used in the measurement of level/flow
measurement/DP of filters.. Here both the lp & hp points
are rather important.

To calibrate the transmitter:

confirm the cell and adapter blocks are clear,

Apply both side the equal pressure by opening the equalizer
valve (Less than its MWP-max working pressure),
should be 4 mA. (This is called Static test)

Make zero trim if found error.

Apply the required range of pressure, only in hp side and
zdj to 20 mA. Again chk 0%, if error found adj zero. After
no error found in zero/span then proceed next step.

Apply pressure and note 4-5 points of its range in hp
side., increasing and decreasing (to avoid hystersis error).

Make write protect and calibration tag on transmitter.

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