Eppendorf Galaxy Gas Analyzer - Manual (Page 30)

Galaxy® Gas Analyzer — Operating manual
30
Protect the instrument from strong, direct sunlight as this will quickly raise the temperature of the
instrument beyond its operating range, causing the LCD display to appear almost black. In this
case, the contrast cannot be adjusted.
Always use the sample filter! If the sample filter becomes flooded, replace it and ensure all
sample tubes are clean and dry before re-use.
Don’t place the instrument against anything hot: this may cause excessive internal temperatures
which can lead to erroneous readings.
Don’t allow the instrument to get wet; for example, protect it from rain.
6.2 Gas measurement process
Depending on preferences, the exact measurement procedure can change. The following
method, which is depicted in the flow diagram, is considered to be the best practice; if you follow
it correctly, quick and consistent readings can be recorded.
1. When the instrument is first switched on, purge it with fresh air by running the pump for
approximately 30 seconds, then allow it to stabilize for a few minutes.
2. Zero the CO
2
channel, following the Calibration instructions (see Setting CO
2
channel zero
on p. 35) for details.
3. The instrument is now ready to take the first reading. Connect the sample tube and sample
filter (always use the sample filter!) from the sample point to the inlet port of the instrument,
ensuring the filter is seated correctly.
4. Press the Pump key to draw a sample into the instrument.
5. Notice the main gas readings start to change. We recommend that you run the pump until the
gas readings have stabilized (approximately 30 seconds), then press the Store soft key.
6. The pump will stop and, if the Prompt ID function is turned on, you will be prompted to enter
an ID code to identify the reading. A “reading stored” confirmation message will be displayed
briefly before returning to the Main screen (“Main Read Screen” in the flow diagram shown).
7. After each reading, purge the instrument with fresh air: disconnect the sample tube from the
instrument, then run the pump for a minimum of 30 seconds. The gas readings should return
to nominal values for fresh air.
Hint!
The ID code prompt can be switched on or off. This option is accessed via the Settings screen
(see Settings on p. 20). If the ID prompt is set to NO, the reading is stored using the default
logging ID.
6
Taking
read
ing
s