OTC25 N
Operation
Deviation Band Alarm 
A Deviation Band is a
deviation. This parameter can be turned off 
or adjusted from 1 to 252° F (1 to 140° C). When the process variable is out- side the deviation band, the alarm is indicated by flashing the display (regardless of whether setpoint or actual temperature is displayed) and the optional alarm output is activated.
Display Units 
This allows the operator to have the display indicate either degrees Fahrenheit or degrees Celsius.
OTC25 L
Operation
OTC25 L Limit Controller
Normal Operation
The factory default display setting of the OTC25 L is for Actual
Temperature 
. The default display may be changed to
setpoint temperature by selecting Limit Setpoint 
at the
Default Display 
parameter selection.
When the Default Display is changed to Limit Setpoint, the limit
setpoint temperature may be adjusted by using the Raise 
or
Lower 
keys. The limit setpoint is adjustable from 32 to 905° F (0 to 485° C).
When the Default Display setting is “Actual” 
, adjustment of the Limit Setpoint may only be accomplished by pressing the
Parameter 
Key momentarily to switch the display to Limit
Setpoint, and then using the Raise 
or Lower 
Keys to change the Limit Setpoint Value. The display will automatically revert back to “Actual” five seconds after the last keypress.
Parameter Configuration
Your OTC25 L controller’s parameter selections are explained on the next page, with default settings shown in Figure 5b.
To enter the configuration menu, press and hold the Parameter key 
for 10 seconds until the display changes to the parame- ter mode. Press the Parameter key again to index through the available parameters. Pressing the Parameter Key for 3 seconds or allowing 60 seconds of inactivity will cause the OTC25 L to exit the menu system and return to normal operating mode.
5
