Setra Systems SRCM Operation page 24

Zero Adjust
Span Adjust
Restore Factory User
Zero and User Span
Test
Pressing Zero Adjust button will bring up a "Is
zero pressure applied?" message. If yes, press OK.
If the zero measurement is within 10% of the fac-
tory zero measurement stored in the unit, the zero
value will be reset.
This requires the use of a Pressure Calibrator, such
as a Setra Model 869 or equivalent. Connect tub-
ing from the Calibrator to the low and high ports
identified near the PCBA markings. Apply Full
Range pressure, for example ± 0.1" WC range, use
0.1" WC. When pressure reaches Full Range pres-
sure, press OK button. The output at Full Range
must be within 10% of the factory calibration to
allow re-adjustment.
If the unit has been mis-calibrated in the field, the
factory zero and span settings can be restored.
The Buzzer, Relay and Internal Memory check-
sum can be tested and verified.
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