4200 Series Transmitters
Instruction Manual
Form 5596
November 2006
20
Note
The potentiometers are 25 turn
trimpots with a slip clutch. To set
these potentiometers at their
maximum counterclockwise position,
turn them 25 or more turns in the
counterclockwise direction.
Setting the High Position Switch
For Type 4210, 4220, 4212, 4222, and 4215 direct
acting transmitters, refer to figure 5 for location of
adjustments.
1. Turn the high position switch potentiometer
(HIGH, R3) fully clockwise.
2. Stroke the valve or device to the point of travel
where the high position switch is to operate (see
figure 7).
3. Apply power to the instrument.
4. Turn the high position switch potentiometer (R3)
slowly counterclockwise until the high position switch
trips, the ohmmeter changes from a high resistance
to a low resistance reading.
5. The high position switch is now set.
Setting the High Position Switch
Deadband
1. Slowly stroke the actuator or device between the
tripped and reset point of the high position switch.
Observe this by the changing readings of the
ohmmeter. Note the differences in travel between
the trip point and reset points. This is the deadband
of the switch.
2. If necessary, increase the deadband by turning
the potentiometer (DBH, R4), clockwise.
3. Repeat steps 1 and 2 until the desired deadband
setting is obtained.
Setting the Low Position Switch
Note
Perform the high position switch
adjustment procedures before
adjusting the low position switch.
1. To provide an indication of switch condition,
remove power from the instrument. Connect an
ohmmeter to TB2 between the (NC) and (C)
terminals (figure 4).
2. Stroke the device to the point of travel where the
low position switch is to operate (See figure 7).
3. Apply power to the instrument.
4. Ensure that the low position switch potentiometer
(LOW, R6, figure 5) is fully counterclockwise as
previously instructed.
5. Turn the low position switch potentiometer (R6)
slowly clockwise until the low position switch trips,
the ohmmeter changes from a high to a low
resistance reading.
6. The low position switch is now set.
Setting the Low Position Switch
Deadband
1. Slowly stroke the actuator or device between the
tripped and reset point of the low position switch.
Observe this by the changing readings on the
ohmmeter. Note the differences in travel between
the trip point and reset points. This is the deadband
of the low position switch.
2. If necessary, increase the deadband, by turning
potentiometer (DBL, R5, figure 5) clockwise.
3. Repeat steps 1 and 2 until the desired deadband
setting is obtained.
4. If adjustments are complete, remove power from
the instrument and disconnect the ohmmeter.
5. Perform the installation and/or operating
procedures to place the transmitter in service and
replace the transmitter covers.
Position Switch Circuit Shutoff
Refer to figure 5 for location of adjustments.
Certain conditions may require the position switch
circuit capabilities to be shut off. To shut off the
position switches, turn the high position switch
potentiometer (HIGH, R3) fully clockwise, and turn
