Section 9
COMPRESSOR MAINTENANCE
AND TROUBLESHOOTING
36
NOTEONTRANSDUCERS:Wheneverasensoris
suspected of fault, the recommended cause of ac-
tion is to measure the signal (pressure, tempera -
ture, etc.) with an alternate calibrated instrument
and compare readings. I f readings conflict, the
electrical and/or tubing connections should be in-
spected, and if no faults are evident, then replace
the sensor and re---evaluate against the calibrated
instrument.
9.9 CALIBRATION
The Supervisor II has software calibration of the
pressure and temperature probes. This calibration
affects the offset but not the slope of th e pressu re
and temperature calculations. Because of this, the
most accurate method is to heat or pressurize the
transducer to its operating value. If this is too diffi-
cult, room temperature/open atmosphere calibra-
tion is adequate. Calibration may only be done
while machine is stopped and unarmed.
To enter calibration mode, you must press the fol-
lowing keys in sequence while in the defaultstatus
display mode: “
”, “Y”, “B ”,PROG.Once
in calibration mode, you will see a screen like the
following:
CAL P1
970
In the a bove example, “0” refers to the amount of
adjustment (in psi or _F, “97” refers to the current
value of P1).
Tomake adjustments, press the “Y” (UPARROW)
key to increase t he value; press the “B
”
(DOWNARROW/ LAMPTEST)keytodecreasethe
value. The number on the left will increase or de-
crease always showing the total amount of adjust-
ment. Maximum adjustment is ¦ 7.
The DISPLY key exits, wiping out changes to the
current item, whilesavingchangest o anyprevious
items. The PROG key saves the current item and
advances to the next. All temperatures and pres-
sures may be calibrated individually.
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