Campbell 31022, Инструкция по эксплуатации

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1
Zero Air Generator
1. Introduction
The Zero Air Generator (pn 31022) provides a convenient source of zero air
(air that contains no CO
2
or water vapor) for zeroing a gas analyzer where
normally a compressed-gas cylinder of zero air would be used. The Zero Air
Generator effectively eliminates the need for a cylinder of compressed gas and
the required pressure regulator and flow controller, making it extremely useful
in zeroing open- or closed-path infrared gas analyzers (IRGA) that are located
in remote field sites.
2. Cautionary Statements
•
READ AND UNDERSTAND the Precautions section at the front of this
manual.
•
WARNING
o
Do not connect the Zero Air Generator to any source of
pressurized air, such as an external pump or a cylinder of
compressed gas.
•
CAUTION
o Do not operate the Zero Air Generator pump with both
outlets,
Out and Test , plugged.
3. Initial Inspection
Upon receipt of the Zero Air Generator, inspect the packaging and contents for
damage. File damage claims with the shipping company. Contact Campbell
Scientific to facilitate repair or replacement.
The Zero Air Generator ships with the instrument, three sets of 1/4-in
Swagelok
®
nuts and ferrules, and two 1.5V AA alkaline batteries.
4. Overview
The Zero Air Generator is a low-cost, handheld source of zero air (air that has
been scrubbed of CO
2
and water vapor) intended for zeroing infrared gas
analyzers (IRGAs). The Zero Air Generator (shown in FIGURE 4-1 ) can be
used to replace the traditional method of zeroing an IRGA requiring a cylinder
of compressed gas with a pressure regulator and flow controller. A simpler
source of zero air is particularly useful in remote field sites.
All IRGAs are subject to drift in the zero response due to aging over time,
changes in temperature, window contamination, etc. An IRGA should undergo
a zeroing procedure frequently to maintain peak accuracy. In many cases,
IRGAs are zeroed infrequently because of the cost and difficulty of providing a
source of zero air.