Eppendorf Galaxy CO2 Sensor - Manual (Page 47)

Operating controls and function for Galaxy 170 S Incubator
Galaxy ® 170 R/170 S CO
2
Incubators
English (EN)
47
7.4.1 Temperature sensor system alarms
There are six temperature sensors: two in the chamber, two in the door and two in the base. If any of these
sensors should fail, the following message will appear:
ºC F.AIL .
Because the incubator can no longer control temperature properly without the failed sensor, the heating
will switch off and the incubator will cool down to room temperature.
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.
7.4.2 Over-temperature cut-out and 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 and alarm system operates in two sequential modes:
Mode 1: The over-temperature cut-out and 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 °Ctrip . 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
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 via the
keypad.
Normal temperature control can be regained and the over-temperature cutout and alarm can be cancelled
by reprogramming the temperature, opening and closing the glass door, or switching the incubator off and
back on.
If the problem persists, the alarm will recur; if this happens, please contact your service representative or
your distributor immediately.
7.5 CO
2
Auto-zero system
Perform the following steps to carry out an auto-zero and reference the CO
2
sensor to atmospheric CO
2
7.5.1 Auto-zero
1. Press the Enter and Programming ( * ) keys simultaneously.
A prompt will appear:
ENT.ER STA.RTS CO2 AUT.O ZER.O