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Instruction Manual
D200354X012
6. If only one output port is used, screw the pipe plug (supplied with the transmitter) into the unused port.
7. Perform the potentiometer alignment and direct/reverse action procedures for all applications.
Potentiometer Alignment
NOTICE
The following procedure must be performed prior to calibrating the transmitter or position switches. Failure to perform
this procedure may result in erratic performance or unit failure.
This procedure adjusts the potentiometer to the center of its electrical travel when the control valve actuator or other
device is at the center of its mechanical travel.
Refer to the Calibration section for the test equipment required in this section.
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.
WARNING
When monitoring current during operation of an intrinsically safe instrument in an intrinsically safe area, a meter approved
for hazardous areas must be used. Personal injury or property damage may result from fire or explosion if an approved
meter is not used in a hazardous area.
Refer to figure 5 for component locations.
1. Remove power from the instrument.
2. Connect the digital voltmeter (DVM) leads as follows:
a. For all transmitters (except a 4212 or 4222) connect between TP3 (+) and TP4 (-) on the printed wiring board.
b. For a 4212 or 4222 transmitter, connect the DVM between TP5 (+) and TP6 (-).
3. Loosen the appropriate set screw connecting the potentiometer shaft to the linkage:
a. For sliding‐stem applications, loosen the set screw (key 26, figure 15) in the operating arm (key 30) on the
potentiometer shaft.
b. For rotary actuator applications, loosen the set screw in the coupling (key 50, figure 19) on the potentiometer
shaft.
c. For long‐stroke applications, leave the coupler (key 100E) rigidly attached to the potentiometer shaft. Loosen
only the coupling screw (key 100F, figures 22 and 23) in the coupler (key 100E) on the transducer shaft.
4. Stroke the actuator or other device to the mid‐stroke position.
Note
On units with position switches, the (R) terminal on TB3 must be connected to the power supply negative (-) terminal as shown in
figure 9 to attain correct potentiometer alignment.
4200 Transmitters
September 2022
13
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