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39
Quick-Helps
1. To return the unit to last operating mode
(Normal, Standby, FOP, or Tune):
Action
Display
From Menu System:
Press and hold
PV + SV + Mode
for 3 sec.
From Security Level Menu: Press
PV+ SV + Mode
2. To enter Standby
operating mode:
Action
Display
From Normal
Press and hold
operating mode:
for 3 sec.
Press
Press
+ PV + SV
From FOP (Manual)
Press and hold
operating mode:
for 3 sec.
Press
Press
+ PV + SV
From Menu System:
Press and hold
for 3 sec.
Press and hold
for 3 sec.
Press
Press
+ PV + SV
38
The Series CN8200
controller is precali-
brated at the factory.
Under normal circum-
stances, the factory
calibration should be
valid for the life of
the instrument. If
recalibration should
be required, allow
the controller to warm
up for 15 minutes
and follow these steps
carefully.
Recalibration
Procedures
1) Remove power from the controller and disconnect all
output devices. Disconnect input. Attach an appropriate
calibrator to the input terminals.
2) Apply power to the calibrator, making sure that the
displayed value is not outside the range of the controller.
Then, apply power to the controller.
3) Index to the Calibration Low menu item in the Calibration
Menu.
(You must have Security Level set to “Factory” to access this menu.)
4) Dial Calibrator to prompted value on the controller’s
display. See chart below for RTD resistance vs.
temperature values.
5) Allow the controller to settle for at least one minute.
6) Press Raise
Key.
7) Repeat Steps 4, 5, and 6 for the Calibration High setting.
8) Press the Menu Access key for three seconds to return to
the Process Value display.
RTD Calibration Values
Degrees (C) Degrees (F) Ohms
0°
768°
328°
32°
1414°
622.4°
100
Ω
366
Ω
222
Ω