Teledyne API - Model T200H/T200M Operation Manual
Calibration Procedures
183
5.2.3.1. Traceability
All equipment used to produce calibration gases should be verified against standards of
the National Institute for Standards and Technology (NIST). To ensure NIST
traceability, we recommend to acquire cylinders of working gas that are certified to be
traceable to NIST standard reference materials (SRM). These are available from a variety
of commercial sources.
Table 5-1: NIST-SRM's Available for Traceability of NO
x
Calibration Gases
NIST-SRM
4
TYPE
NOMINAL
CONCENTRATION
2627a
2628a
2629a
Nitric Oxide (NO) in N
2
Nitric Oxide (NO) in N
2
Nitric Oxide (NO) in N
2
5 ppm
10 ppm
20 ppm
1683b
1684b
1685b
1686b
1687b
Nitric Oxide (NO) in N
2
Nitric Oxide (NO) in N
2
Nitric Oxide (NO) in N
2
Nitric Oxide (NO) in N
2
Nitric Oxide (NO) in N
2
50 ppm
100 ppm
250 ppm
5000 ppm
1000 ppm
2630
2631a
2635
2636a
Nitric Oxide (NO) in N
2
Nitric Oxide (NO) in N
2
Nitric Oxide (NO) in N
2
Nitric Oxide (NO) in N
2
1500 ppm
3000 ppm
800 ppm
2000 ppm
2656
2660a
Oxides of Nitrogen (NO
x
) in Air
Oxides of Nitrogen (NO
x
) in Air
2500 ppm
100 ppm
2659a
Oxygen in Nitrogen (O
2
)
21 mol %
5.2.4. DATA RECORDING DEVICES
A strip chart recorder, data acquisition system or digital data acquisition system should
be used to record data from the serial or analog outputs of the T200H/M. If analog
readings are used, the response of the recording system should be checked against a
NIST traceable voltage source or meter. Data recording devices should be capable of bi-
polar operation so that negative readings can be recorded. For electronic data recording,
the T200H/M provides an internal data acquisition system (DAS), which is described in
detail in Section 4.7. APICOM, a remote control program, is also provided as a
convenient and powerful tool for data handling, download, storage, quick check and
plotting.
5.2.5. NO
2
CONVERSION EFFICIENCY (CE)
To ensure accurate operation of the T200H/M, it is important to check the NO
2
conversion efficiency (CE) periodically and to update this value as necessary.
The default setting for the NO
2
converter efficiency is 1.0000. For the analyzer to
function correctly, the converter efficiency must be
≥0.90 (90% conversion efficiency)
as per US-EPA requirements. If the converter’s efficiency is outside these limits, the
NO
2
converter should be replaced.
Note
The currently programmed CE is recorded along with the calibration data in the
DAS for documentation and performance analysis.
07270D DCN7141