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Instruction Manual
D200354X012
Maintenance
WARNING
To avoid personal injury or property damage from the sudden release of pressure:
D Always wear protective clothing and eyewear when performing any maintenance operations.
D Do not remove the actuator from the valve while the valve is still pressurized.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
on both sides of the valve.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
WARNING
Do not remove the covers on explosion-proof instruments when an explosive atmosphere is present. Personal injury or
property damage may result from fire or explosion if covers are removed in an explosive atmosphere.
Test equipment for the following procedure is listed in the Calibration section. Voltage references in this procedure
may vary depending on the temperature of the instrument. The voltages below are taken at approximately 22_C
(72_F) ambient temperature.
NOTICE
Electrostatic voltages present in the environment may be transferred to the transmitter printed wiring board which may
cause failure or degraded performance. Use appropriate antistatic procedures when working with the printed wiring board
to protect the electronic circuits.
The following procedures consider the instrument assembled with all components installed according to the type
number description. The following procedures can be used in the field or for a bench check. Connect the instrument as
shown in figure 8 for bench check.
4200 Transmitters
September 2022
25
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