13
Section 9
System Alarms
9.1
Temperature Sensor Alarms.
9.1.1 In the event of any one of the four temperature sensor failing (there are two in the door and
two for the chamber), the following message will appear
°
°°
°
C FAIL
C FAILC FAIL
C FAIL
Because the incubator can no longer control temperature properly the heating will switch off and the
incubator will cool down to room temperature.
If a sensor fails but subsequently corrects itself, the temperature control will restart and an alarm
message as follows will be remain on the temperature side of the display
SAL
SALSAL
SAL
...
This message can be cancelled by pressing any key.
9.2 Over Temperature Cut-out / Alarm.
9.2.1 This alarm only occurs if the Chamber temperature exceeds the programmed temperature
by 1°C or if the element exceeds Set Point + Chamber Control Point Hi +1°C. The
activation threshold is fixed and cannot be adjusted.
9.2.2 Following activation, the over temperature cut-out / alarm system operates in 2 sequential
modes:-
Mode 1:- Over temperature cut-out / alarm activates and cuts power to the heating
elements and the CO
2
control valve. The condition is shown on the display by the message
°
°°
°
Ct
Ct Ct
Ct riP
riP riP
riP
. When the chamber temperature has fallen to the programmed set point, the
system changes to mode 2.
Mode 2:- The control system then tries to maintain the chamber temperature at the
programmed level by switching the heating elements on and off using an emergency less
precise control method. The message
tAL
tALtAL
tAL
. will flash on screen to signal that an over
temperature fault occurred and the incubator is being controlled by the emergency control
system. This message cannot be cancelled from the keypad.
9.2.3 Normal temperature control can be regained and the over temperature cut out / alarm
cancelled by reprogramming the temperature, opening / closing the glass door, or switching
the incubator off / on. If the problem persists the alarm will re occur, if this happens please
consult your distributor.
9.3
CO
2
Alarms.
9.3.1 This alarm only occurs if the CO
2
Auto Zero cannot adjust to reference the signal to
atmosphere at the end of the Auto Zero the following message will appear
AUTO ZERO FAI LED
AUTO ZERO FAI LEDAUTO ZERO FAI LED
AUTO ZERO FAI LED
This means that the CO
2
Sensor is defective and requires replacement.
If any of these alarms occur then contact your distributor immediately.
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