Teledyne T200, Руководство по эксплуатации, Страница: 50 / 425

Getting Started Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual
48
ATTENTION
COULD DAMAGE INSTRUMENT AND VOID WARRANTY
Venting Pressurized Gas:
In applications where any gas (span gas, zero air supply, sample gas) is received
from a pressurized manifold, a vent must be provided to equalize the gas with
ambient atmospheric pressure before it enters the analyzer to ensure that the
gases input do not exceed the maximum inlet pressure of the analyzer, as well as
to prevent back diffusion and pressure effects. These vents should be:
• at least 0.2m long
• no more than 2m long
• vented outside the shelter or immediate area surrounding the instrument
Dust Plugs:
Remove dust plugs from rear panel exhaust and supply line fittings before
powering on/operating instrument. These plugs should be kept for reuse in the
event of future storage or shipping to prevent debris from entering the
pneumatics.
I
MPORTANT
Leak Check:
Run a leak check once the appropriate pneumatic connections have been
made; check all pneumatic fittings for leaks using the procedures defined in
Section 11.3.12.1.
3.3.2.1. ABOUT ZERO AIR AND CALIBRATION (SPAN) GAS
Zero air and span gas are required for accurate calibration.
Note Z
ero air and span gases must be supplied at twice the instrument’s specified
gas flow rate. Therefore, the T200 zero and span gases should be supplied to
their respective inlets in excess of 1000 cc3/min (500 cc3/min x 2).
Z
ERO
A
IR
Zero air, or zero calibration gas, is similar in chemical composition to the measured
medium but without the gas to be measured by the analyzer.
For the T200 this means zero air should be devoid of NO, NO
2
, CO
2
, NH
3,
and H
2
O
vapor.
Note Moderate amounts of NH3 and H2O can be removed from the sample gas stream
by installing the optional sample gas dryer/scrubber (see Section 3.3.2.6).

If your application is not a measurement in ambient air, the zero calibration gas
should be matched to the composition of the gas being measured.

Pure nitrogen (N2) could be used as a zero gas for applications where NO
X
is
measured in nitrogen.

If your analyzer is equipped with an external zero air scrubber option, it is capable
of creating zero air from ambient air.
06858E DCN7057