090 Series Reference Manual
2/21/05
Digital Control Systems
Page: 4
Calibrating Process Input
The process input can be calibrated from the front panel by pressing and holding both ‘UP’ and
‘DOWN’ buttons for approximately three seconds until the display shows one of the calibration
indicators shown in the table below:
INDICATOR Cal
Mode
CP
IC temp probe calibration
CO
Offset Calibration
CS
Span Calibration
Table 2:
Calibration Mode Annunciation
The type of calibration is determined by the sensor input configuration.
After displaying the calibration indicator for several seconds, the display blinks the current
process value to indicate that it can be changed with the ‘UP’ and ‘DOWN’ buttons.
After approximately five seconds elapse without either button being pressed, the controller will
exit calibration mode. If the displayed value is to be changed, the operator must begin making
the change within a few seconds after the display begins to blink. When the changes are
complete, the controller will return to normal operation approximately five seconds after the last
button press.
At this point the new calibration value is stored in non-volatile memory and takes effect
immediately.
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