Maintenance; Inspection And Maintenance; Troubleshooting; Replacing Common Controller Parts - Emerson Fisher KC Series Instruction Manual

Instruction Manual
Form 5207
April 2007
Section 6

Maintenance

Controller parts are subject to normal wear and must
be inspected and replaced as necessary. The
frequency of inspection and parts replacement
depends upon the severity of the service conditions.
When inspection or repairs are required,
disassemble only those parts necessary to
accomplish the job.

Inspection and Maintenance

WARNING
The following maintenance
procedures require taking the
controller out of service. To avoid
personal injury and property damage
caused by uncontrolled process
pressure, observe the following before
performing any maintenance
procedures:
Before performing any maintenance
operations:
D Always wear protective clothing,
gloves, and eyewear.
D Provide some temporary means
of control for the process before
taking the controller out of service.
D Shut off the supply pressure to
the controller.
D Personal injury or property
damage may result from fire or
explosion if natural gas is used as the
supply pressure medium and
preventative measures are not taken.
Preventative measures may include:
Remote venting of the unit,
Re-evaluation the hazardous area
classification, ensuring adequate
ventilation, and the removal of any
ignition sources. For information on
remote venting of this controller, refer
to page 2-5.
D Disconnect any operating lines
providing supply air pressure, a
process input signal, or other
pressure source to the controller.
D Check with your process or
safety engineer for any additional
4195KA, KB, KC, and KS Controllers
measures that must be taken to
protect against process media.
Unless otherwise noted, key numbers
refer to figures 7-1 through 7-7.
Figures 3-1 and 3-3 show adjustment
locations for 4195KA Series
controllers, figures 4-1 and 4-3 show
adjustment locations for 4195KB and
KC Series controllers, and figures 5-1
and 5-2 show adjustment locations for
4195KS Series controllers. For
maintenance on the indicator
assembly, refer to figures 7-2, 7-3 and
7-4.
Select the appropriate maintenance procedure and
perform the numbered steps. Each procedure
requires that the supply pressure be shut off before
beginning maintenance.
The maintenance procedures section describes part
replacement common to 4195KA, KB, KC, and KS
Series controllers. After completing the maintenance
procedures, perform the appropriate calibration
procedures. Unless otherwise noted, calibration
procedures for the 4195KA Series controller are in
Section 3, calibration procedures for the 4195KB
and KC Series controller are in Section 4, and
calibration procedures for the 4195KS Series
controller are in Section 5. If difficulty is encountered
performing the calibration procedures in Section 3,
4, or 5 refer to the calibration procedures in this
section.

Troubleshooting

As an aid to troubleshooting, table 6-1 lists some
common operating faults, their probable cause, and
suggests procedures for correcting the faults.

Replacing Common Controller Parts

To avoid personal injury or property
damage caused by the uncontrolled
release of pressure, be sure any
trapped process pressure is properly
vented from the controller. Vent any
supply pressure from the controller
before disassembly.
Note
WARNING
6-1