32331 Ver 1 QBD, QBA, QBH,
Page 7 Operating Manual
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Alarm
The alarm is a deviation alarm, settable from 0.5 to 10 ºC. If the actual temperature
deviates from the set point by more than the value selected the alarm will sound and
the fault lamp illuminates. It is only activated once the actual value has been within ±
0.2 ºC of the set value for 2 minutes. It does not affect the normal operation of the
unit.
1 Press F to enter main menu.
2 Rotate control knob until display shows .
3 Press S to select alarm control.
4 Display will show or . Rotate knob to desired state and press S to se-
lect.
5 If is selected the display will flash and show the current set value. Rotate
control knob until desired value is shown. (The alarm limit is ± 0.5
o
C to
±10.0
o
C) If is selected the display will return to the actual temperature.
6 Press S to set alarm state once the desired value has been selected.
7 The display will return to actual temperature. No indication is given that the
alarm is set.
8 If the temperature is outside the limit set for more than 10 seconds, the buzzer
will sound and the display will alternate between actual temperature and .
9 To reset the alarm press either F or S key. If the alarm conditions still exist the
alarm will re-activate after 10 seconds.
10 To disable the alarm feature select at point 4 above.
Note:
The alarm value and set state condition are retained in memory.
Offset
The offset feature allows the user to change the temperature from +3ºC to –7 ºC in
order to allow single point calibration.
1 Press F to enter main menu.
2 Rotate control knob until display shows .
3 Press S to select offset control.
4 The display will flash and show current value. Rotate the control knob until de-
sired value is shown.
5 Press S to confirm the offset value.
6 To cancel the offset, set the value to ..
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