SERVOPRO NOx Analyzers Page
GAS HANDLING EQUIPMENT
Pressure regulators for zero gas (air or N
2
), ozone supply (air or O
2
) and span gas
cylinders are required for gas analysis using the SERVOPRO NOx analyzer.
GAS CONNECTIONS
If the calibration gases are not connected to calibration inlets on the back of the analyzer
(if optional solenoid valves have been installed), the calibration gases will need to be
delivered through the sample port at the pressure settings listed above.
The tubing from the sampling system to the gas analyzer should be made from corrosive-
resistant material such as Teflon
®
or glass-coated Stainless Steel. Rubber or soft vinyl
tubing should not be used since readings may be inaccurate due to gas absorption into the
tubing material. For fast response, the tubing should be as short as possible and glass-
coated Stainless Steel. Optimum tube internal diameter is 0.16 inch (4 mm). Couplings to
the instrument are ¼-inch (6mm) tube.
CAUTION: Be sure tubing and joints are clean. Dust entering the
instrument may cause it to malfunction.
NOTE: High levels of ammonia (greater than 10 ppm NH
3
) may reduce the NO
2
/NO
converter's efficiency to a level that is unacceptable. If ammonia levels above 10 ppm
are expected, it is recommended that a commercially available ammonia scrubber be
purchased and installed on the sample line prior to the sample entering the analyzer.
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