Instruction Manual
D103292X012
C1 Controllers and Transmitters
March 2017
36
b. Unscrew the spring adjustor (key 65), removing the bias spring (key 70) and washers (key 64) with it.
c. Unclip the lock spring (key 72). Remove the indicator scale (key 69) and proportional band adjustment knob
(key 73).
d. Remove the gain adjustment bar (key 63). Flip it over so it attaches to the opposite side of the cantilever spring
(key 8) as shown in figure 18 and re-attach.
the lock spring (key 72).
f. Tighten down the spring adjustor (key 65) with the bias spring (key 70) and washers (key 64) until it stops against
the gain adjustment bar (key 63).
g. Turn the proportional band adjustment knob to the 10 setting. If it cannot be turned, loosen the spring adjustor
(key 65).
6. Change the reversing block assembly (figure 16 or 18, key 37):
the sealing screw head. Replace the O-ring if necessary.
O-rings (key 77) located in the recessed area under the reversing block screw head and between the reversing
block assembly and the calibration adjuster (key 36). Replace these O-rings if necessary.
c. Position the reversing block assembly, with an O-ring, on the calibration adjuster (key 36) so that the nozzle is on
the opposite side of the beam (key 39) from which it was removed. Position the reversing block hole in the
calibration adjuster. Install the reversing block screw (key 50) with an O-ring (key 77).
d. Install the sealing screw (key 49) with an O-ring in the hole previously covered by the reversing block assembly.
7. Check all connections for leaks with a soap-and-water solution. Perform the appropriate calibration procedures.
Relay Replacement
Key numbers used in this procedure are shown in figure 22 or 23 except where indicated.
1. Shut off the supply pressure and process pressure line(s) to the controller or transmitter.
2. Disconnect the tubing (key 24) from the relay.
3. Unscrew the output or supply pressure gauge (key 2).
4. To remove the relay assembly, unscrew two Phillips-head machine screws (key 29, not shown) located behind the
relay on the back of the case.
5. Remove the relay gasket (key 19, figure 22).
6. A new relay can be installed as a replacement. If a new relay is being installed, continue with the next step.
7. Attach the replacement relay and new relay gasket with machine screws inserted through the back of the case.
Reinstall the output or supply gauge.
8. Connect the tubing, and check all connections for leaks. Perform the appropriate calibration procedures.
