Eppendorf S Series 48S CO2 Incubator User Manual
Page 26
26
CO48S-0050
Galaxy S Series 48 S Personal Size CO
2
Incubator
User’s Guide
If, however, a sensor fails but subsequently corrects itself, the temperature
control will restart and an alarm message will remain on the temperature side of
the display:
SAL
... (meaning Sensor Alarm).
This message can be cancelled by pressing any key.
3.8.2
Over-Temperature Cut-out & Alarm
This alarm only occurs if the chamber temperature exceeds the Temperature
setpoint by 1°C or if one of the heating elements exceeds a specific activation
threshold. The activation threshold is set at the factory and cannot be adjusted.
Following activation, the over-temperature cut-out & alarm system operates in
two sequential modes:
Mode 1: The 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 riP
. When the chamber temperature has fallen to
the programmed setpoint, 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 control method that is, however, less precise. The message
tA
L. 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 via the keypad.
Normal temperature control can be regained and the over-temperature cut-out &
alarm can be cancelled by reprogramming the temperature, opening and closing
the door, or switching the incubator off and then back on.
If the problem persists, the alarm will recur; if this happens, please contact your
service representative or your distributor immediately.
3.8.3 CO
2
Control System Alarm
This alarm only occurs if the CO
2
AutoZero cannot reference the sensor signal
to atmosphere. If this is the case, at the end of the AutoZero procedure, the
following message will appear:
CO2 AUTO ZERO FAI LED
. This means that
the CO
2
sensor is defective and requires replacement.
If this alarm occurs, contact your service representative immediately.