Environnement AS32M, Техническое руководство, Страница: 100 / 186

Environnement
S.A
AS32M
Duplication prohibited
DECEMBER 2013
3–62

Connect the analog output (refer to Table 3-1 ) of the analyzer to the recorder. Use the recorder
response to calibrate the analyzer as described below.

Connect the sample inlet of the analyzer to the manifold of the dilution system.

Adjust the dilution system so that it generates a total flow rate of zero air greater than 20 % of the
sample flow rate of the analyzer.

Generate zero air. Wait for the measurement to stabilize (recommended timing is 1800 sec.).
Write down the «Z
NO2
» value from the screen. This value is stated as percentage of maximum
response of the recorder (e.g., 400 mV/10 V = 4 %).

Carry out the adjustment of the calibration coefficient according to the procedure described in
section 3.4.3 “Checking of one scale point”.
To calculate the value of the generated span, use the following calculation:
 
 
2
2
2
2
NO D
NO cylinder
generated
F F
F NO
NO



Where:

 
generated
NO 2
is the NO
2
concentration of the gas generated at the manifold outlet.

 
cylinder
NO 2
is the NO
2
concentration of the certified cylinder.

2 NO
F
is the NO
2
flow rate in NI/min.

D
F
is the flow rate of dilution air in NI/min.
To calculate the read value in ppm from the value in % of the full scale, use the following formula:
 
SCA
Z S
NO
NO recorded
read









100
2
2
where:

recorded
S
is the value noted on the recorder, in percentage of the recorder full scale

SCA
is the analyzer full scale

2 NO
Z
was measured previously

Next generate the five other concentrations of NO
2
between 15 % and 90 % of the full scale, with
varying flow rates
2 NO
F
and/or
D
F
.

Plot the values of
 
read
NO 2
as a function of the
 
generated
NO 2
values, including the zero air point.
Check the linearity.