Baker Hughes Masoneilan 4700P, Instruction Manual

Page: 36 / 66

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Calibration
General
WARNING
Before commencing any calibration or maintenance
procedure on these positioners, ensure that the valves
under control are isolated from the controlled process
and that the area is verified as nonhazardous.
The Model 4700P/4700E and 4800P/4800E positioner, when factory mounted, has been
calibrated for the proper valve, valve action, and positioner action. If, for any reason, the cam
holder (36) setting has been disturbed (i.e., a change of positioner action, field mounting,
maintenance, etc.), it is necessary to follow all steps of the calibration instructions, according to
desired actuator action and positioner action.
For proper performance when the valve is installed, calibrate the positioner as part of the
normal installation procedure. Shipping, handling and installation can cause some changes in
the calibration.
Calibration may entail just a simple adjustment or a complete field mount. Define the scope of
work and follow the applicable sections.
CAUTION
Do not attempt to remove cam if cam is not at low
signal line of lobe (low end of range). Refer to
calibration instruction for proper valve action and
positioner action before removing or replacing cam and
tightening set screws (35) to proper torque.