CRANE
CO.
280
N.
MIDLAND
AVE.,
STE
258,
SADDLE
BROOK,
NJ
07663
WWW.AVIDCONTROLS.COM
12/17/12
TECH-440/D.W.O. 23135
Page 40 of 55
Appendix A
Procedure to Adjust the Error 3 Setting (or Low input pressure)
Note: The error 3 message threshold is pre-set from the factory. For a low
pressure positioner it is set to 15 psi and for a high pressure positioner it is
set at 55 psi. If these settings come out of calibration or if it is necessary to
change these settings, the following instructions can be followed.
1. Before adjusting the Error 3 threshold setting the positioner must be mounted and
set-up. See section 3 of this manual.
2. To adjust the setting of the Error 3 threshold message to indicate low input pressure,
there is an adjustment screw located on the top of the pneumatic transducer (see
figure below).
3. To set the Error 3 threshold for an explicit pressure value, loosen the lock nut on
the adjustment screw and
gently
turn the screw clockwise as far as it will go. Do
not force the screw past its limit or diaphragm assembly may be damaged.
4. Regulate the supply pressure to the pressure you would like to set as a low input
pressure flag.
5. Turn the adjustment screw slowly counter-clockwise to the point where the Err 3
message appears on the LCD.
6. Set this point by tightening the lock nut. Be careful not to affect the adjustment
screw setting.
7. Re-regulate the supply air to the normal operating pressure.
Error 3
Adjustment Screw
(With Locknut)
Transducer
