Emerson Fisher C1 User Manual

Instruction Manual
D103292X012
C1 Controllers and Transmitters
March 2017
33
12. Check all tubing connections for leaks and the bellows yoke machine screws, tighten as necessary. Perform the
appropriate calibration procedures.
Changing Reset Valve
1. Disconnect the appropriate tubing and remove the reset restriction valve assembly (key 256, figure 23) by
removing the screw (key 22, not shown) from the back of the case. Install the desired replacement assembly.
2. Connect the tubing, check all connections for leaks and perform the appropriate calibration procedures.
Changing Anti-Reset Windup Differential Relief Valve
Refer to figure 24 for key number locations.
1. Note the controller output pressure (zero or supply) when the process is shut down.
2. Remove the differential relief valve assembly.
3. Refer to figure 14. Install the replacement relief valve with the arrow positioned so that the controller output will be
as noted in step 1 when the process is shut down.
Changing Action
Proportional-Only to a Differential Gap Controller
A proportional-only controller may be changed to a differential gap controller, or vice versa, by changing the position
of the proportional tubing and inverting the proportional band assembly.
1. Isolate the controller or transmitter from process, control, and supply pressure. Vent any trapped pressure from the
controller or transmitter before proceeding with the following steps.
2. Disconnect the proportional tubing (key 25, figure 16) from the mounting base (key 57, figure 24 or 25) and
reinstall it in the other connection in the mounting base.
Figure 16. Reverse/Direct Acting Tubing Connection for Differential Gap Controller
REVERSE ACTING
POSITION
REVERSING BLOCK
(KEY 37)
PROPORTIONAL BAND ASSY
DIRECT ACTING
REVERSE ACTING
GE34724-B
RELAY TUBING
(KEY 24)
DIRECT ACTING
POSITION
PROPORTIONAL TUBING
(KEY 25)
PROPORTIONAL
BAND ASSY
DIFFERENTIAL-GAP CONTROLLER
FLAPPER/SCREW
(KEYS 40 AND 46)
REVERSING BLOCK
(KEY 37)
FLAPPER/SCREW
(KEYS 40 AND 46)
PROPORTIONAL TUBING
(KEY 25)
RELAY TUBING
(KEY 24)
BELLOWS
(KEY 52)
BELLOWS
(KEY 52)

Emerson Fisher C1 Specifications

General

Brand	Emerson
Model	Fisher C1
Category	Transmitter
Language	English