Eppendorf Galaxy Gas Analyzer - Manual (Page 36)

Galaxy® Gas Analyzer — Operating manual
36
7.4.2 Setting CO
2
channel span
We recommend that you set the span to target the desired reading range (e.g., 5 %); ideally this
should not be a level close to zero.
1. In the User Calibration screen, press the numeric 3 key (3-Span with CO
2
(Fig. 26 on p. 35)).
2. If not already preset, enter the span target (i.e., the certified concentration of your calibration
gas) by pressing the numeric 1 key and entering the new value.
3. Attach the CO
2
gas and open the regulator valve to allow the gas to flow.
4. Press the Start key and wait for the reading to stabilize. This can take a couple of minutes.
5. Once a stable reading is shown, press the Accept soft key. A successful span calibration
message should then be displayed. Press the Accept soft key again to confirm the calibration
and press the Store key to retain the new user span. Alternatively, you may press the Reject
soft key to exit without change.
7.4.3 Setting O
2
channel zero
It is not necessary to zero the O
2
channel. A span calibration should correct the reading across
the whole range.
7.4.4 Setting O
2
channel span
We recommend that you use fresh air with a target concentration of 20.8 % oxygen to set the
span of the O
2
channel, although other gases and target concentrations can be used if required.
1. If not already preset, enter the span target (i.e., the certified concentration of your calibration
gas) by pressing the numeric 1 key and entering the new value.
2. Press the Start soft key and wait for the reading to stabilize (this can take a few minutes).
Press the Pump key to draw in fresh air.
3. Once a stable reading is displayed, press the Accept soft key. A successful span calibration
message should then be displayed. Press the Accept soft key again to confirm the calibration
and press the Store key to retain the new user span. Alternatively, you may press the Reject
soft key to exit without change.
7.4.5 Reset factory settings
The Factory Reset option will reset the instrument to its factory programmed calibration
characteristics, thereby clearing any user calibration points stored for both gas channels.
To reset to factory settings from the Main screen:
1. Press the Menu key on the instrument panel.
2. Press the numeric 3 key to select Calibration.
3. Press the numeric 1 key (see Fig. 25 on p. 34).
4. You will be prompted for a confirmation (see Fig. 27 on p. 37), to prevent unintentional
deletion of user calibration data:
CAUTION!
 Do not exceed the maximum input pressure of 250 mbar (3.6 PSI).
 Do not exceed the maximum input flow rate of 250 ml per minute.
Hint!
If the calibration fails, try again using a longer purge time or a different target gas.
Hint!
If the calibration fails, try again using a longer purge time or a different target gas.
7
Calibration