Teledyne 9110AH - Nitrogen oxides analyzer - Manual (Page 89)

TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
7-1
7 CALIBRATION AND ZERO/SPAN CHECKS
There are several ways to check and adjust the calibration of the M9110AH. These different
methods are summarized in the following Table 7-1. In addition, all of the methods described
in this section can be initiated and controlled via the RS-232 port, see Section 5.7 for details.
We strongly recommend that SPAN CALIBRATION be done with NO span gas. Since NO is
unaffected by the converter, both channels can be accurately calibrated. It is also important that
there be some oxygen in the span gas. Inaccurate calibration of the NO
x
channel can result from
calibration gasses containing no oxygen. All calibration gasses must have a dew point of <
-20
o C.
NOTE
The quality of calibration can be no better than the accuracy and
quality of the calibration gasses used. See Section 7.9 Calibration
Quality for recommendations on calibration gasses and Section 9.2.10.
NOTE
If there are any problems completing any of the following procedures,
refer to Section 9.2.8 and 9.2.9- Unable to Span or Zero.
Before Calibration
1. Use the SETUP-RNGE menu to set the range the instrument will be operated in.
2. If you are using any of the following features, they must be set up before calibration:
A. Autoranging or Remote Ranging - See Section 7.7
B. Independent Ranges - See Section 7.8
C. NO only or NO
x
only mode, Section 7.5 and 7.6
Normal calibration assumes that these features are already set up.