
Environnement
S.A
MIR 9000
Duplication prohibited
3–52
JULY 2009
3.4 CALIBRATION
3.4.1 GENERAL
To ensure the quality of the measurements made by the MIR 9000 analyzer, it is necessary to
proceed regularly with control and calibration operations in accordance with the user’s quality
assurance plan.
−
Control of the zero and scale point:
This operation consists of comparing the analyzer’s response on a zero air and a gas of known
concentration.
The object of this control is to evaluate the analyzer’s drift in time without correction of the
calibration coefficients.
The "ZERO" and "SPAN" inputs can be used for this operation.
Frequency
: usually monthly, although this depends on the conditions of use and application.
In certain conditions, taking into account the analyzer’s low drift, a six-monthly
control is sufficient.
−
Calibration
It is a procedure to correct the analyzer’s response at a scale point situated:
•
either at a concentration close to the values measured regularly on the installation.
•
or at a concentration close to the standard limit value of the installation.
Frequency
: function of the results of the zero and calibration controls.
Note on the gas generation device:
For the devices supplying a gas under pressure, it is necessary to set up an excess system for
delivering the gas at the atmospheric pressure when entering the analyzer. The materials comprising
this device should be neutral for the gases used. In the case of using the analyzer alone (without
TIG) in automatic cycle with a gas cylinder, supply a solenoid valve that can be controlled remotely
by the analyzer (see Figure 3.6).
Содержание Envea MIR 9000
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