Section 3
Model 601/601P/602/602P/603 NDIR Analyzer
California Analytical Model 600_NDIR_Series_v10.0 CE
Operators Manual
Page 24 of 86
3.6.
Gas Handling Equipment
1)
Pressure regulators for zero gas (Air or N2), and span gas cylinders.
2)
Corrosive resistant gas tubing.
3.7. Gas
Connections
The tubing from the sampling system to the gas analyzer should be made from corrosive-
resistant material such as Teflon or stainless steel. Even when the gases being sampled are
corrosive themselves, rubber, or soft vinyl tubing should not be used since readings may be
inaccurate due to gas absorption into the piping material. To obtain fast response, the tube
should be as short as possible. Optimum tube internal diameter is 0.16 inch (4 mm).
Couplings to the instrument are ¼-Inch tube.
Note: Be sure tubing and joints are clean. Dust entering the instrument may cause it to
malfunction.
3.8. Sampling
Requirements
3.8.1. Filtration
Dust must be eliminated completely. Use filters as necessary. The final filter must be
capable of removing particles larger than 4 microns.
3.8.2. Condensation
Dew point of the sample gases must be lower than the instrument temperature to prevent
accidental condensation within the instrument. Bypass the sample through a dehumidifier
to reduce the dew point to about 2 to 4° C or less. If the sample contains an acid mist, use
an acid mist filter, cooler or similar device to remove all traces of the mist.
3.8.3.
Presence of Corrosive Gases
High concentrations of corrosive gases such as Cl
2
, SO
2
, F
2
, HCl, in the sample gas
shorten the useful service life of the instrument.
3.8.4. Gas
Temperature
Do not exceed the maximum rating of the instrument 104º F (50º C) when measuring high
temperature gases.
3.8.5.
Sample Gas Bypass Outlet (Vent)
A sample gas bypass outlet connector is located on the rear panel (¼ Inch Tube).
Pressure at this outlet should be kept at atmospheric level.
ANY
backpressure will cause
an error in reading.
Summary of Contents for 600-NDIR
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