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Table A - Exhaust Vented to Atmosphere
Supply Pressure (psig)
Up to 50
51-200
201-600
Table B - Exhaust Vented to Pressure System
Supply Pressure (psig)
Up to 50
51-200
201-600
Deadband Setting
1�
Turn the deadband adjustment drum in the direction of
increasing numbers until the drum can no longer turn�
Then turn the adjustment drum one full turn in the opposite
direction (use the numbers on the drum as a guide)�
2�
If not already attached, wind 3-4 coils of the range spring
onto the retainer�
3�
If not already adjusted, set the bias adjustment screw in the
middle of its travel range�
4�
Apply power gas to the HPP-5 positioner�
5�
Set the instrument signal pressure at the midpoint of its
range (e�g� 9 psig for a 3-15 psig range, 18 psig for a 6-30 psig
range)� Allow the actuator to stroke the valve to an intermedi-
ate position and the gauge pressures to balance� (if the valve
does not stroke, ensure that the positioner is communicating
with the actuator cylinder)� If equipped with an MCV-3 manual
control valve, make sure the left handle is in automatic�
6�
If the actuator is equipped with an MCV-3 manual control
valve), place the left handle in the manual position� If the
actuator is not equipped with an MCV-3 manual control valve,
use the block valve (1/4-inch ball valve) installed between the
positioner output and the actuator� Once the actuator has
reached its desired position (based on the mid-signal applied
to the instrument port – Step 5), place the block valve in the
closed position�
5 | GE Oil & Gas
Cylinder Bore (in.)
4
5
6
Variable Orifice
3
3
3
2
2
3
2
2
2
Cylinder Bore (in.)
4
5
6
Variable Orifice
3
3
3
4
4
4
2
2
2
8
10
12
14
4
4
5
6
3
4
5
6
3
3
4
5
8
10
12
14
4
4
5
6
5
4
6
6
3
3
4
5
7�
Final Sensitivity Drum Adjustment for positioner's bleeding
to atmosphere: Disconnect any bug vent or tube fitting from
the exhaust port� Turn the deadband adjustment drum in
the direction of decreasing numbers, until the exhaust port
begins to bleed gas� Then turn the drum in the opposite
direction until the exhaust port stops bleeding�
The unit is properly adjusted if increasing or decreasing the
input signal by �2 psig causes the cylinder top and bottom
gauges to develop a differential equal to at least 20 percent
of power gas�
Replace the exhaust fitting�
For positioner's bleeding to a pressure system:
Slowly decrease the setting of the deadband (decreasing
numbers) until both cylinder gauges are equal and read 90 to
95 percent of power gas pressure�
NOTE: When increasing or decreasing the instrument signal,
the output pressure should swing up and down� When
changing direction of the false instrument signal, the output
pressure should immediately reverse direction� Any "bump" or
initial reaction of the gauge in the wrong direction indicates
friction (requiring the unit be rebuilt to eliminate the friction)�
8�
Place the instrument signal to automatic and open the block
valves or return the left handle of the MCV manual control
valve to automatic�
© 2014 General Electric Company. All rights reserved.
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