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Teledyne API T802 Paramagnetic O
2
Analyzer Operation Manual
47
Table 3-8: NISTSRMs Available for Traceability of O
2
Calibration Gases
NIST-SRM Type Nominal Concentration
2657a
O
2
in N
2
2%
2658a
O
2
in N
2
10%
2659a
O
2
in N
2
21%
2619a
1
CO
2
in N
2
0.5%
2620a
1
CO
2
in N
2
1%
2622a
1
CO
2
in N
2
2%
2624a
1
CO
2
in N
2
3%
2744b
1
CO
2
in N
2
7%
2745
1
CO
2
in N
2
16%
1
Used to calibrate optional CO
2
sensor.
3.3.2.3. INTERFERENTS
It should be noted that other gases also react to magnetic influences and will be
detected by the T802’s paramagnetic sensor. Usually this influence is extremely
minor and can be disregarded; however, several gases, such as Nitrogen dioxide
(NO
2
) and Nitric oxide (NO), have strong enough paramagnetic properties to be
of concern.
If the Sample Gas to be measured contains high levels of these gases, the gases
used for both the zero point calibration and the span calibration should contain
the same components in the same proportion in order to cancel any interference
effects. Performing calibrations with O
2
mixed in N
2
in such applications, could
induce significant errors into the O
2
measurements.
3.3.2.4. BASIC PNEUMATIC CONNECTIONS
See Figure 3-4 for the location and descriptions of the various pneumatic
inlets/outlets referred to in this section.
See Section 3.3.2 for information regarding the pneumatic setup of T802
analy
zer.
IMPORTANT
IMPACT ON READINGS OR DATA
Sample and calibration gases should only come into contact with
Stainless Steel, PTFE (Teflon) tubing, glass or electroless nickel.
07275B DCN6418