11. Calibration
When the instrument is first installed , or after a long period of downtime, a moderate zero shift is normal. This is due
to the rubber diaphragms which are stretched by the internal springs. After a few operations, the instrument will
settle into its normal operating condition. It is recommended that, under these circumstances, instruments should be
exercised by alternately applying zero and full scale signals several times. Zero calibration should then be carried
out.
Air Supply
Minimum signal
Adjust zero control (anti-clockwise) to
give minimum required output pressure
+ to Maximum Signal
Adjust range control (anti-clockwise on 2-wire, clockwise on 3
wire) to give maximum required output pressure
Note: Reverse Acting Operation
1 About 20 turns of the zero screw may
be required to reset the zero point.
2 3-wire instruments require to be factory
set for reverse action.
3 Reverse action is not currently
available on high pressure models
4 Do not over wind nozzle to prevent
jamming
a
.
b
.
c
.
