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4-12 | Thermox CG1000 Oxygen Analyzer
Cal Flow Sensor
If calibrating the flow sensor, you must always use a mixture of nitro-
gen and oxygen as your carrier gas.
NOTE
The flow sensor is calibrated at the factory. Only calibrate the flow
sensor if the analyzer loses its EEPROM memory.
To calibrate the flow sensor, follow the steps below (you will need to use a
mechanical flow meter to complete this procedure):
1.
Open the valve on the mechanical flow meter as far as possible. This
prevents overpressure problems that could damage the analyzer flow
sensor. The pressure into the analyzer must not exceed 5 psig (344 mil-
libar gauge).
2.
Connect the mechanical flow meter to the outlet port on the back of
the CG1000 analyzer.
3.
Select Carrier Gas from the Setup key menu.
4.
Select the Cal Flow Sensor menu option.
You will be prompted to define the flow rate for the sample gas:
5.
Enter the desired flow rate for gases entering the sensor, then press
the Enter key. The acceptable range is 150 sccm (+/- 5 sccm). You must
ensure that gases flow into the analyzer at the same flow rate to en-
sure consistent readings. This applies to both calibration and sample
gases.
You are then prompted to adjust the flow of gases into the analyzer to
the desired flow rate as defined in Step 5 above.
6.
Adjust the flow until it stabilizes at 150 sccm on the mechanical flow
meter, then press the Enter key.
Flow Set:
x sccm
New value?
Adjust mech flow rate
Enter to continue
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