25
New Brunswick Scientific Co., Inc.
User’s Guide
During operation, if the temperature of the chamber is more than 1.0
°
C higher or lower
than the temperature setpoint, an alarm is triggered. This alarm consists of a flashing
°
C
INDICATOR
and audible beep. The alarm will automatically deactivate as the unit
achieves the set temperature.
6.8
Temperature Offset Calibration
The temperature probe and the temperature controller are calibrated together at the
factory. The temperature probe measures the temperature of the air at the probe’s
location, near the heat exchanger return vent. The controller uses the probe input to
adjust air temperature, up or down, to match the temperature setpoint.
Depending on various conditions within the chamber, such as flask placement and size,
the heat produced by growing organisms, heat losses due to liquid evaporation from
flasks, etc., the display temperature may differ from temperatures within the flasks
themselves.
If you wish to have the temperature display (“Indicated Temperature”) match the
temperature at a given point, or match the average of a series of points within the
chamber (“Actual Temperature”), proceed as follows:
1. Let the unit equilibrate at or near the desired temperature. Record the Indicated
Temperature.
2. Record the Actual Temperature.
3. Calculate the temperature correction value: Actual Temperature – Indicated
Temperature = Temperature Correction Value.
4. Press
the
SELECT KEY
until the function
°
C INDICATOR
illuminates.
5. Simultaneously press the
V
and
W
KEYS
. The display will indicate
CAL
.
6. Using
the
V
or
W
KEY
, enter the Temperature Correction Value calculated in Step 3
above.
7. Simultaneously press the
V
and
W
KEYS
to save the Temperature Correction Value to
memory.
NOTE:
The
°C
light will pulse rapidly to indicate it is not operating in the factory
default mode.
To return to the factory calibration:
1. Press
the
SELECT KEY
until the function
°
C INDICATOR
illuminates.
2. Simultaneously press the
V
and
W
KEYS
. The display will indicate
CAL
.
3. Using
the
V
or
W
KEY
, set the Temperature Correction Value to zero.
4. Simultaneously press the
V
and
W
KEYS
. The rapid pulsing of the
°
C INDICATOR
will stop.
