130
AO2000
CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
6
The following status messages are active during the heating-up phase:
"Operating temperature": the temperature of the detector has not yet
reached the threshold.
"Flame error": the flame has not yet ignited.
"Temperature limit value 1, 2": the temperature of the detector (
T-Re.D
)
and possibly of the heated sample gas connection (
T-Re.E
) is over or
below the upper or lower limit value 1 (2).
"Pressure limit value 1, 2": the pressure at one of the internal pressure
regulators for instrument air (
inlet
,
outlet
), combustion air (
air
) or
combustion gas (
H2
) is over or below the upper or lower limit value 1 (2).
7
As soon as the temperature of the detector reaches the threshold value
(150 °C) the corresponding solenoid valve in the analyzer module auto-
matically switches off the instrument air. The negative pressure regula-
tion and the combustion air regulation attempt to adjust the pressures
to the respective set point.
The sample gas begins to flow through the analyzer after the instrument
air is connected.
8
After the pressures have been adjusted to the respective set point, the
respective solenoid valve in the analyzer module automatically connects
the combustion gas. The combustion gas regulation attempts to adjust
the pressure to the set point.
Adjustment of the controlled variables of the internal pressure regula-
tors
If the analyzer module is not automatically put into service with the
pressure values specified in the analyzer data sheet, the controlled vari-
ables of the internal pressure regulators must be adjusted. If the con-
trolled variables of the internal pressure regulators deviate, the inlet
pressures of instrument air, combustion air and combustion gas must
be changed (steps 9 to 11).
9
Instrument air: use the external pressure regulator to set the controlled
variable for
Outlet
to approx. 60 % (max. 70 %).
Controlled variable too high
reduce pressure.
Controlled variable too low
increase pressure.
(The controlled variable for
Inlet
depends on the sample gas flow
rate.)
10
Combustion air: use the external pressure regulator to set the controlled
variable for
Air
to approx. 55 % (max. 60 %).
Controlled variable too high
reduce pressure.
Controlled variable too low
increase pressure.
11
Combustion gas: use the external pressure regulator to set the con-
trolled variable for
H2
to approx. 42 % (max. 52 %).
Controlled variable too high
increase pressure.
Controlled variable too low
reduce pressure.
