Environnement AF22e, Техническое руководство, Страница: 77 / 118

Duplicationh prohibited
AF22e
Environnement
S.A
3–43
APRIL 2016
3.5.3. TWO-POINT CALIBRATION
3.5.3.1. Equipment required
– Zero reference :
Use method described in section 3.5.1.1.
–
Span point:
Use method described in section 0.
3.5.3.2. Procedure
−
Zero calibration:
•
Use the key to start a zero-reference cycle on the zero inlet port (minimum 600 sec). Wait
for measurement to stabilize. Measurement should be within ± 0.5 ppb (taking account the offset
if it is programmed). If this is not the case, it is necessary to change the internal zero filter load
(refer to maintenance sheet in section 4).
−
Span point correction:
•
Automatic correction:
Use the key to start a calibration cycle. The analyzer switches automatically to the
programmed inlet port if the optional programmed inlet is set to ON. Otherwise, use the
key to select span inlet or the key to select sample inlet before starting a calibration cycle.
The analyzer automatically modifies its calibration coefficient as a function of the programmed
gas concentration. Recommended duration for self-calibration is 600 seconds.
•
Manual correction:
Use the key (span inlet) or the key (sample inlet) to select the appropriate inlet to
which the gas is connected. Wait for the measurement to stabilize. Set the desired K in «
Calibration coef. » field of
« Advanced analyzer configuration » screen, as follows:
= ×
For details about the calculation of span gas values and read values, refer to section 3.4.3.4.
CAUTION: It is important to note the former K reading before modifying it, since it will be deleted
when the new K validation is done.