Section 5
MAINTENANCE AND TROUBLESHOOTING
28
NOTE ON TRANSDUCERS:
Whenever a sensor issuspected offault, therecom-
mended cause of action is to measure the signal
(pressure, temperature, etc.) with an alternate cali-
brated instrument and compare readings. If read-
ings conflict, the electrical and/or tubing connec-
tions should be inspected, and if no faults are evi-
dent, then replace the sensor and re---evaluate
against the calibrated instrument.
5.5 CALIBRATION
The Supervisor
II
has software calibration of the
pressure and temperature probes. This calibration
affects the offset but not the slope of the pressure
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-
tionisadequate. Calibration mayonlybedonewhile
machine is stopped and unarmed.
To enter calibration mode, you must press the fol-
lowing keys in sequence while in the default status
display mode: “
”,
“
Y
”
, DISPLY,
“
B
”
,
PROG.
Once in calibration mode, you will see a
screen like the following:In the above example, “0”
CAL P1
970
refers tothe amount of adjustment (in psi or
_
F, “97”
(6.7 bar) refers to the current value of P1).To make
adjustments, Press the “
Y
” (UP ARROW) key toin-
crease the value, pressthe“
B
”(DOWNARROW
/ LAMP TEST) key to decrease the value. The num-
ber on the left will increase or decrease always
showing the total amount of adjustment. Maximum
adjustment is
¦
7.The
DISPLY
keyexits, wiping out
changes to the current item, while saving changes
toany previous items. The
PROG
keysaves thecur-
rentitemandadvances tothe next. All temperatures
and pressures may be calibrated individually.
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