TELEDYNE API T300, Руководство по эксплуатации

Страница: 74 / 347

Getting Started Teledyne API – Model T300/T300M CO Analyzer
72
3.4.4.1. INTERFERENTS FOR CO MEASUREMENTS
It should be noted that the gas filter correlation method for detecting CO is subject to
interference from a number of other gases that absorb IR in a similar fashion to CO.
Most notable of these are water vapor, CO
2
, N
2
O (nitrous oxide) and CH
4
(methane).
The T300/T300M has been successfully tested for its ability to reject interference from
of these sources, however high concentrations of these gases can interfere with the
instrument’s ability to make low-level CO measurements.
For a more detailed discussion of this topic, see Section 12.2.1.3.
3.4.4.2. INITIAL CALIBRATION PROCEDURE
The following procedure assumes that:
•
The instrument DOES NOT have any of the available calibration valve or gas inlet
options installed;
•
Cal gas will be supplied through the SAMPLE gas inlet on the back of the analyzer
(see Figure 3-4)
•
The pneumatic setup matches that described in Section 3.3.2.1.
V
ERIFYING THE
T300/T300M R
EPORTING
R
ANGE
S
ETTINGS
While it is possible to perform the following procedure with any range setting we
recommend that you perform this initial checkout using following reporting range
settings:
•
Unit of Measure: PPM
•
Analog Output Reporting Range: 50 ppm
•
Mode Setting: SNGL
06864D DCN7562