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OTC25 N
Operation
Figure 5a. Series OTC25 N Parameters and Default Settings
Parameter Descriptions
Default Display
This parameter determines whether the OTC25 N’s display shows the
Setpoint or the actual temperature by default. Regardless of the selection
made here, the operator can observe the other value by momentarily
pressing the Parameter Key. This will cause the alternate value to be
displayed for five seconds.
Control Hysteresis
Control Hysteresis is adjustable between 2 and 252° F (1 to 140° C ). This
parameter is used by the control algorithm to prevent rapid cycling of the
output around Setpoint. The default value is 4° F (2° C). This means the
heat will turn OFF when the Actual Temperature exceeds the Setpoint by 2°
F (1° C). Conversely, the heater will not turn ON until the Actual
Temperature drops 2° F (1° C) below the Setpoint.
Display Offset
Display Offset is adjustable from -126 to 126° F (-70 to 70° C). It can be
used to provide limited adjustment of the displayed temperature as a com-
pensation for offsets between the true temperature and the temperature
seen by the thermocouple.
Parameter Range Range Display Options Default Default
°F °C °F °C
Default
Display
Control 2 to 1 to
Hysteresis 252 140
Display -126 to -70 to
Offset 126 70
Deviation OFF, 1 OFF, 1
Band Alarm to 252 to 140
Display
Units
Low
Fixed Fixed
Calibration
High
Fixed Fixed
Calibration
To enter the configuration menu, press and hold the Parameter
key for 10 seconds until the display changes to the parameter
mode. Press the Parameter key again to index through the avail-
able parameters. Pressing the Parameter Key for 3 seconds or
allowing 60 seconds of inactivity will cause the OTC25 N to exit the
menu system and return to normal operating mode.
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