Teledyne 9110TH - Nitrogen Oxides Analyzer - Manual (Page 188)

Model 9110TH NOx Analyzer Calibration Procedures
Teledyne Analytical Instruments 168
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 9110TH/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 9110TH/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 9110TH/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 between 0.9600 and 1.0200 (96-
102% 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.