Carrier Gas Connection - Hach BioTector B7000 User Manual

5.3.1 Carrier Gas Connection

The recommended carrier gas for BioTector is Oxygen (O
(CO), Nitrogen (N ), Hydrocarbons and Water. In BioTector TOC TN analyzers, the carrier gas has to be
2
Nitrogen free Oxygen gas.
WARNING
The oxygen gas can be supplied to BioTector from;
A) An oxygen concentrator with instrument air
B) An oxygen concentrator with compressor
C) A welding grade oxygen cylinder
Typical oxygen purity in the oxygen concentrator is 93% (±3%) with balance gas Argon. Typical oxygen purity
in the oxygen cylinder is greater than >99.5%.
When welding grade oxygen cylinder is used, a 50 liter oxygen cylinder is recommended. The oxygen cylinder
should be installed in accordance with site regulations and/or your oxygen supplier's recommendations. The
cylinder should be well secured. Before connecting the pressure regulator, check that there is no moisture,
dirt or grease at the connection. Connect the pressure regulator according to the manufacturer's
specifications.
The oxygen supply pressure to the analyzer is typically;
A) 1250-2000 mbar from the oxygen concentrator using instrument air
B) Depending on the type, from 550 mbar to 750 mbar from the oxygen concentrator with compressor
C) 1000 mbar from the welding grade oxygen cylinder
BioTector uses an average of 22 L/hour (367 ml/min) oxygen during online operation.
Figure 13 below illustrates the three options for oxygen supply: A) Oxygen concentrator with instrument air, B)
Oxygen concentrator with compressor and C) Welding grade oxygen cylinder.
Do not allow oxygen to come in direct contact with grease, oil, fat and other
combustible materials, as it may explode. If uncertain how to handle oxygen
cylinders or high concentration oxygen, contact your local oxygen dealer.
Oxygen generators or cylinders can be supplied by BioTector distributors as an
extra option.
), free of Carbon dioxide (CO
2
), Carbon monoxide
2
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