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4660 Pressure Pilot
June 2017
5. Connect an external pressure source to the process pressure connection. This external pressure source should be a
regulated air or gas supply that is adjustable to zero. The external pressure source must be capable of supplying a
process pressure that will be equal to or greater than the desired high set point pressure.
6. Continue with the appropriate procedures described below. Replace the cover and cover screws after all
adjustments are completed.
Setting the High and/or Low Set Point(s)
1. Adjust the external process pressure source to the desired high or low set point. For example, if the pilot is to trip at
3.4 bar (50 psig), apply 3.4 bar (50 psig) to the pilot. Use a pressure gauge to measure the process pressure.
2. Rotate the locking arm clockwise to unlock the module. Slowly turn the HIGH SET or LOW SET knob until the pilot
trips.
3. Push the small button in the center of the knob with a ball point pen or pencil and rotate the scale with the
thumbwheel on the right hand edge of the module (see figure 5) until the number 50 aligns with the mark on the
left‐hand edge of the module window.
4. Rotate the locking arm counterclockwise to lock the module.
5. Repeat steps 1, 2, and 3 for the other module, if specified.
Prestartup Checks
Before using the pilot in an actual startup, verify that both the high and low set point pressures are set at the desired
pressure settings.
WARNING
To avoid personal injury or property damage caused by a sudden release of pressure, do not exceed the Bourdon Tube
rating (see tables 2 and 3).
1. After the desired low set point pressure has been adjusted, increase the external pressure source pressure until the
output pressure of the pilot is at full output. Do not exceed the set range (see tables 2 and 3) for the appropriate
Bourdon tube range.
2. Increase the external pressure source pressure until the output pressure of the pilot has changed from full output to
zero. Listen carefully. You will hear a quick change in sound when the output changes.
3. Compare the pressure of the external pressure source with the desired high set point setting.
4. If necessary, adjust the high set point pressure by turning the HIGH SET knob clockwise to increase and
counterclockwise to decrease the high set point setting. Once the desired high set point is achieved, rotate the
locking arm to the locked position.
5. Decrease the external pressure source until the output pressure of the pilot is again at full output.
6. Continue to decrease the external pressure source pressure until the output pressure of the pilot has changed from
full output to zero. Listen carefully. You will hear a quick change in sound when the output changes.
7. Compare the pressure of the external pressure source with the desired low set point setting.
8. If necessary adjust the low set point pressure by turning the LOW SET knob (key 67) clockwise to increase and
counterclockwise to decrease the low set point setting. Once the desired low set point is achieved, rotate the
locking arm to the locked position.
Alignment of the Nozzle Beam
Perform this procedure before startup if the self‐aligning disc of the nozzle beam is noticeably misaligned with respect
to the nozzle area of the block‐and‐bleed relay (see figures 7 and 8). Key numbers are shown in figure 8.
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Instruction Manual
D200163X012
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