Instruction Manual
D200160X012
4195K Controllers
July 2018
51
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 preventive measures are not taken. Preventive measures may include, but are not limited to, one or more
of the following: 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 14.
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 measures that must be taken to protect against process
media.
Note
Unless otherwise noted, key numbers refer to figures 7‐1 through 7‐7. Figures 3‐1 and 3‐3 show adjustment locations for 4195KA
controllers, figures 4‐1 and 4‐3 show adjustment locations for 4195KB and KC controllers, and figures 5‐1 and 5‐2 show
adjustment locations for 4195KS 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 controllers.
After completing the maintenance procedures, perform the appropriate calibration procedures. Unless otherwise
noted, calibration procedures for the 4195KA controller are in Section 3, calibration procedures for the 4195KB and KC
controller are in Section 4, and calibration procedures for the 4195KS 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.
