Bray Series 6P
Operation and Maintenance Manual
11
Adjustment – Cam
1. If the valve actuator rotates counter-clockwise to
open the valve on increasing air signal, the face
of the cam must show “RA (CCW)” (Factory
Default). If used on a valve-actuator which ro-
tates clockwise to open the face of the cam must
show “DA (CW)” on the face.
2. With the valve in the closed position, loosen the
cam locking allen key and adjust the cam so the
reference line on the cam points to the center of
the bearing.
Adjustment – Zero Point
1. Set the signal to 3 psi. Rotate or turn the Zero
Adjustment wheel clockwise or counter-clockwise
so the pressure at OUT 1 port just begins to change.
CAUTION
Be cautious of moving positioner, actuator, and
valve parts while operating.
Adjustment – Span
1. After setting the Zero Point, increase the signal
pressure to 15 psi. Loosen the locking screw
slightly, and rotate or turn the Span Adjustment
Screw clockwise or counter-clockwise until the
actuator achieves its 90° or full open position.
2. Changing the Span Adjustment affects the Zero
Point setting. Decrease signal to 3 psi and
re-check the Zero Point and adjust as needed.
3. Re-check the Span Adjustment Screw by
repeating step 1. Steps 1 & 2 may need to be
repeated several times to optimally calibrate the
positioner. Once the Span and Zero Point are
set, tighten the Zero and Span Locking Screws
shown below.
NOTICE
The Series 6P may be 2 way split range by
changing the Span Spring. Consult factory for
additional parts required.
Zero Adjustment
Wheel
Lock Screw
(Reverse acting)
(Direct acting)
Cam reference line
Counter-clockwise - To Open
RA(CC
W)
Bearing
0
Clockwise - To Open
0
DA(
CW
)
S P A N
Lock Screw
(1) Span
Adjustment Screw
Figure 11
Figure 12
Figure 13
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