Starting Up the Gas Analyzer 97
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
automatically switches off the instrument air. The negative pressure
regulation and the combustion air regulation attempt to adjust the
pressures to the respective setpoint.
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 setpoint, the
respective solenoid valve in the analyzer automatically connects the
combustion gas. The combustible gas regulation attempts to adjust
the pressure to the setpoint.
Adjust the controlled variables of the internal pressure
regulators
If the analyzer is not automatically put into service with the pressure
values specified in the analyzer data sheet, the controlled variables of
the internal pressure regulators must be adjusted. If the controlled
variables of the internal pressure regulators deviate, the inlet
pressures of the instrument air, combustion air and combustion gas
must be adjusted.
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 increase pressure.
Controlled variable too low reduce pressure.
11 Combustion gas: use the external pressure regulator to set the
controlled variable for H2 to approx. 42 % (max. 52 %) .
Controlled variable too high increase pressure.
Controlled variable too low reduce pressure.
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