Duplication prohibited
MIR 9000
Environnement
S.A
3–53
JULY 2009
External solenoid
valve command
SPAN INPUT
Collector
Solenoid valve
Valve
Double
pressure
regulator
Gas cylinder
Air vent
ANALYZER
Figure 3–6 – Example of a gas connection under pressure
3.4.1.1
Zero air generation
−
A gas cylinder of reconstituted air or nitrogen or generator of zero air. The zero air should be
exempt of all constituents susceptible of being measured by the analyzer, with a dew point lower
than –40°C.
3.4.1.2
Generation of span gas
−
Control and calibration: cylinder of span gas in the nitrogen (pre 2 %) concentration is
approximately equal to ; either the value measured regularly or the limit value imposed by the local
regulations. The bottle used should be certified regularly according to the user’s quality assurance
plan.
NOTE :
During the exchange of a cylinder of span gas, it is recommended to compare the reading of
the analyzer on the span gas before and after changing the cylinder in order to appreciate
any possible fault in the new cylinder.
3.4.1.3
Use of the automatic cycles
−
“Zero”
cycle:
The zero air generation device will be permanently connected to the analyzer’s zero air input.
Recommended duration: 600 s.
−
Calibration
cycle:
The span gas generation device will be permanently connected to the analyzer’s span input.
Recommended duration: 600 s.
NOTE :
The automatic cycles are configured in the
”Span / Cycles”
menu.
Summary of Contents for Envea MIR 9000
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