Environnement AS32M, Техническое руководство, Страница: 97 / 186

Duplication prohibited
AS32M
Environnement
S.A
DECEMBER 2013
3–59
3.4.4.2 Procedure

Zero checking:

With the [Sample] or [Span] key, select the inlet used and wait for measurement to stabilize.
The analyzer response should be between -1 and +1 ppb.

Next carry out a zero reference cycle by pressing the [Z. Ref.] key of the
« Cycle »
submenu in
the
« MEASUREMENT »
menu.

Calibration correction:

Automatic:
Select the measurement range corresponding to the span gas titration, as well as the inlet
used and press the [Auto] key (for use of this function, refer to section 0
« MEASUREMENT

Instantaneous »
). The analyzer automatically modifies its span coefficient according to the
programmed titration. The recommended duration for the auto-calibration is 1200 seconds.
NOTE :
During the cycle, the displayed NO
2
measurement uses the previous calibration coefficient.
This calibration coefficient is updated when the Auto-calibration cycle is finished.
If the new calibration coefficient is out of the limits of the previous calibration coefficient

50 %, the
analyzer will send a calibration alarm message. In this case, verify the following:

Fluid circuit of calibration

Concentration generated by the used gas source

Concentration of the programmed span gas

Programmed gas inlet
If one of the items above is wrong, correct it and carry out a new auto-calibration cycle. If they are all
correct, carry out a manual adjustment of the calibration coefficient as follows:

Manual adjustment:
Select the inlet where the gas is connected by pressing the [Sample] or [Span] key. Wait for
the measurement to stabilize. Program the new calibration coefficient in the
« SPAN

Coefficients»
screen.
Calculation of the new calibration coefficient
:
 
x =
offset) (without value read
value gas span
K K
(old) new
K
(new)
is the new calibration coefficient
K
(old)
is the previous calibration coefficient
ATTENTION :
It is advised to write down the « K
(old)
» before modifying it because it will be
cancelled by the validation of the «K
(new)
».
3.4.4.3 Use of Auto-calibration cycle
To program this cycle, refer to section 3.3.3.3 –
« SPAN

Cycles »
menu.
To configure the concentration, refer to section 3.3.3.2 –
« SPAN

Select gas »
menu.
The gas generation system will be permanently connected to the span gas inlet of the analyzer. The
recommended timing for the automatic calibration is 1200 seconds.