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Getting Started
3.5. PNEUMATIC CONNECTIONS
Note
Do not operate this instrument until you've removed dust plugs from SAMPLE and EXHAUST
ports on the rear panel!
REAR PANEL LABEL
SAMPLE
EXHAUST
SPAN
ZERO AIR
3.5.1. ABOUT ZERO AIR AND CALIBRATION (SPAN) GASES
3.5.1.1. Zero Air
3.5.1.2. Calibration (Span) Gas
42
To prevent dust from getting into the analyzer, it was shipped with small plugs
inserted into each of the pneumatic fittings on the rear panel. Remove and store
the dust plugs for future use, such as storage, moving, shipping.
Table 3-10: Inlet / Outlet Connector Descriptions
Connects the sample gas to the analyzer. When operating the analyzer
without zero span option, this is also the inlet for any calibration gases.
Connects the exhaust of the analyzer with the external vacuum pump.
On Units with a zero/span valve, this port connects the external calibration gas
to the analyzer.
On Units with a zero/span valve, this port connects the zero air gas or the zero
air cartridge to the analyzer.
Zero air or zero calibration gas is defined as a gas that is similar in chemical
composition to the measured medium but without the gas to be measured by the
analyzer, in this case NO and NO
air scrubber option, it is capable of creating zero air from ambient air.
If your application is not a measurement in ambient air, the zero calibration gas should
be matched to the matrix of the measured medium. Pure nitrogen could be used as a
zero gas for applications where NO
apply if measuring NO
X
more information.
Calibration (or Span) gas is a gas specifically mixed to match the chemical composition
of the type of gas being measured at near full scale of the desired measurement range.
In this case, NO
NO and NO
X,
recommended that you use a span gas with an NO concentration equal to 80% of the
measurement range for your application.
EXAMPLE: If the application is to measure between 0 ppm and 500 ppm, an
appropriate span gas concentration would be 400 ppm NO
Even though NO gas in nitrogen could be used as a span gas, the matrix of the balance
gas is different and may cause interference problems or yield incorrect calibrations. The
same applies to gases that contain high concentrations of other compounds (for example,
Teledyne API - Model T200H/T200M Operation Manual
CAUTION!
FUNCTION
. If your analyzer is equipped with an external zero
2
is measured in nitrogen. Special considerations
X
in a matrix that does not contain oxygen, see Section 8.3.11 for
measurements made with the T200H/M, it is
2
.
x
07270D DCN7141
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