Eppendorf Galaxy CO2 Sensor - Manual (Page 34)

Operating controls and function for Galaxy 170 R Incubator
Galaxy
® 170 R/170 S CO
2
Incubators
English (EN)
34
6.4.1 SET DATE AND TIME
The date and time is factory set and will only require adjustment if you are in a different time zone, or when
you change your clocks to Daylight Saving Time and back again to Standard time. You may also select the
style of display for the date.
6.4.2 AUDIBLE ALARM VOLUME ADJUST
The audible alarm volume can be adjusted to your own preferences.
6.4.3 PROGRAMMABLE CO
2
AUTOZERO
When you select this feature, the PROGRAM CO
2
AUTOZERO screen (see Fig. 6-3 on p. 34) allows you to
program the Auto-Zero frequency and time, or to run the Auto-Zero function manually.
We recommend that you Auto-Zero the CO
2
system:
• Prior to using the incubator for the first time.
• Once a month when your incubator is operating, to ensure that the CO
2
level is as accurate as possible.
• After the incubator has been in storage (or transit) for a while.
The Auto-Zero System automatically re-references the CO
2
Sensor to atmospheric CO
2
in the following
way:
1. A pump activates for two minutes, pumping atmosphere at 0.3 liters/minute into the sensor’s measuring
chamber. This displaces the chamber atmosphere completely from the sensor.
Abb. 6-3: PROGRAM CO 2 AUTOZERO screen
Fig. 6-3: PROGRAM CO
2
AUTOZERO screen
2. At the end of the countdown, the control system adjusts the Auto-Zero Factor to reference the sensor to
0.05 % CO
2
, which is the approximate atmospheric level.
3. The pump switches off and the chamber atmosphere diffuses back into the sensor’s measuring
chamber. This takes three minutes, after which the normal CO
2
control system takes over.
This procedure does not affect the internal chamber environment and will not affect your cell
culture as it is being performed.