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Teledyne API - Model 200EH/EM Operation Manual Calibration Procedures
157
7.1.4. 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 M200EH/EM. 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
M200EH/EM provides an internal data acquisition system (iDAS), which is described in detail in Section 6.7.
APICOM, a remote control program, is also provided as a convenient and powerful tool for data handling,
download, storage, quick check and plotting.
7.1.5. NO
2
CONVERSION EFFICIENCY
To ensure accurate operation of the M200EH/EM, 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 iDAS for
documentation and performance analysis
7.1.5.1. Determining / Updating the NO
2
Converter Efficiency
The following procedure will cause the Model 200EH/EM to automatically calculate the current NO
2
conversion
efficiency.
STEP ONE:
Connect a source of calibrated NO
2
span gas as shown below.
Source of
SAMPLE GAS
Removed during
calibration
MODEL
200EH/EM
SAMPLE
EXHAUST
PUMP
MODEL 700
Gas Dilution
Calibrator
VENT
MODEL 701
Zero Gas
Generator
NO
x
Gas
(High Concentration)
VENT here if input
is pressurized
Figure 7-1: Gas Supply Setup for Determination of NO
2
Conversion Efficiency
04521C (DCN5731)