Instruction manual

OTC25 N
O p e r a t i o n
9
OTC25 N
O p e r a t i o n
8
Deviation Band Alarm
A Deviation Band is a pre-set number of degrees, plus and
minus, around the Setpoint Value, ex.
+
10° F. A Deviation
Band Alarm provides an indication to the operator that the
Actual Temperature has either exceeded or dropped below
the chosen deviation. This parameter can be turned off
or adjusted from 1 to 252° F (1 to 140° C). When the process
variable is outside 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.
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 compensation for offsets between the true
temperature and the temperature seen by the thermocouple.