Bourdon Tube Travel Stop Installation And Adjustment - Emerson Fisher 4195KA Instruction Manual

4195K Controllers
July 2018
13. Remove the tape from the process pointer and connect link 1 to the Bourdon tube.
14. Perform the controller calibration procedures and, if necessary, the appropriate remote set point calibration
procedure in Section 3, 4, or 5.

Bourdon Tube Travel Stop Installation and Adjustment

WARNING
Refer to the Maintenance WARNING on page 51.
Note
The process indicator should be calibrated before installing or adjusting travel stops. Refer to the appropriate process indicator
zero and span calibration procedure in Section 3, 4, or 5.
Refer to figure 6‐18 for adjustment locations and figure 7‐1 for key number locations.
The lower travel stop is necessary only if the operating range lower limit is greater than 0 bar or 0 psig (elevated zero)
For example: The process scale limits may be 0 to 300 psig, but the range of operation is 150 to 300 psig. In this
example the elevated zero is 150 psig and the lower travel stop would be adjusted for 5 percent of the process scale
span less than 150 psig (150 - (0.05 X 300) = 135 psig).
1. Remove the two screws (key 6), and lift off the proportional band indicator cover (key 36).
2. Set the proportional band between DIRECT and REVERSE.
3. Install the upper travel stop (key 73) or upper and lower travel stops (keys 73 and 74) with the machine screws (keys
75 and 76). Do not tighten the machine screws (key 75) that secure the upper travel stop. If only the upper travel
stop is installed, go to step 10. Otherwise proceed with step 4.
4. If the operating range lower limit is 0 bar (0 psig), and a lower travel stop is installed, adjust the lower travel stop
adjustment so it does not interfere with the Bourdon tube. Tighten the lower travel stop adjustment lock nut
and proceed to step 10. If the operating range lower limit is other than 0 psig (elevated zero), perform steps 5
through 15.
5. If the process scale lower limit is other than 0 psig, adjust the process pressure to 5 percent of the process scale
span less than the operating range lower limit (see example at the beginning of this procedure).
6. Adjust the lower travel stop adjustment (shown in figure 6‐18) until it touches the Bourdon tube.
7. Tighten the lower travel stop adjustment lock nut.
8. Increase the process pressure to the operating range lower limit.
9. The Bourdon tube should not touch the lower travel stop. If it does, repeat steps 5 through 8.
10. Apply process pressure to the controller equal to 105 percent of the process scale span.
11. Slide the upper travel stop (key 73) until it touches the Bourdon tube.
12. Tighten the machine screws (key 75).
13. Decrease the process pressure to 100 percent of the process scale span.
14. The Bourdon tube should not touch the upper travel stop. If it does, repeat steps 10 through 13.
15. Adjust the proportional band to 400 percent in the desired action and install the proportional band indicator cover
(key 36). Tighten the two screws (key 6).
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Instruction Manual
D200160X012