Greenheck El-O-Matic E and P Series - Manual (Page 10)

8.
Calibration - Zero and Range
Before making any adjustments positioner should
be properly mounted, the cam should be in the
correct sector on the correct side as determined
from the cam markings.
Zero Adjustment
The zero adjustment is carried out externally, this is
located at the right hand side of the positioner
casing and is accessed by means of a removable
plug.
1. Remove the access plug (1).
2. Adjust the instrument signal to its minimum value
(0.2 bar for a 0.2-1.0 bar range),
(3 psi for a 3-15 psi range).
3. Rotate the Zero adjusting screw (2) until the
actuator just begins to move. Turning the adjust-
ing nut clockwise raises the start value.
4. After adjustment, replace the access plug (1).
Range Adjustment
Remove the cover from the positioner exposing the
knurled range adjuster ring, this is located at the
righthand side of the assembly.
The factory set range is so that a 0.2 to 1.0 bar (3-
15 psi) instrument pressure produces a full stroke
movement. This may be changed by resetting the
full stroke position (max. opening) at the 1.0 bar
(max. instrument) pressure. To adjust the range
carry out the following:
1. Increase the instrument signal to its maximum
value (1.0 bar for a 0.2 to 1.0 bar range), (15 psi
for a 3-15 psi range).
2. If the actuator does not reach its final position,
rotate the knurled adjusting ring (3) in CCW-
direction until the full stroke position is reached.
3. Turning the range screw cw reduces the range;
ccw increases the range.
4. After range adjustment, reset the zero position
and adjust it if necessary.
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