48 ACF5000 FTIR ANALYZER SYSTEM | OI/ACF5000-EN REV. A
Start of the measurement
On a restart, the analyzers start to measure automatically:
the oxygen sensor within a few minutes of the circuit breakers being
activated;
the FTIR spectrometer within 5 to 10 minutes of the circuit breakers
being activated (the LEDs Power and Status illuminate green);
the FID on successful completion of the start sequence.
FID restart
Heating-up phase, connect supply gases
1 Select the Controller measured values menu item:
MENU → Diagnosis/Information → Module-specific →
Controller measured values
In this menu item, the position values of the temperature controllers are
displayed, among other things:
T-Re.D Temperature of the ASP block
T-Re.E Temperature of the FTIR cell
T-Re.IP Temperature of the instrument air pre-heating
TR.VV1 Temperature of the pre-amplifier
The temperature values increase slowly after activating the power supply.
2 Connect instrument air, combustion air and combustion gas. Adjust the
pressure to the value specified in the Analyzer Data Sheet with the cor-
responding external pressure regulator.
3 The controlled variables of the internal pressure regulator are also dis-
played in the Controller measured values menu item; the pressures
of the supply gases are set by means of the controlled variables:
SGI Pressure on the measured gas nozzle
SGO Pressure in the combustion chamber (output)
C-air Combustion air
C-gas Combustion gas
Random values can initially be displayed for the position values. The
values are updated for the first time approx. 10 s after selecting the
menu option and then approx. every 10 s. The pressure control is in pro-
gress in the background. It may take some time to set the pressures
depending on the setting of the inlet pressure.
The analyzer system automatically reverts to the measurement mode to
display measured values if the operator has not pressed a key in menu
mode in the last five minutes.
4 During the heating phase, the following status messages are displayed:
"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 ASP block
(T-Re.D) and possibly of the FTIR cell (T-Re.E) is above 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 (input, output), combustion air (air) or
combustion gas (H2) is above or below the upper or lower limit value 1
(2).
5 As soon as the temperature of the detector reaches the threshold value
(150°C), the corresponding solenoid valve in the FID automatically
switches off the instrument air. The negative pressure regulation and
the combustion air regulation attempt to adjust the pressures to the
respective set point.
The sample gas begins to flow through the FID after the instrument air
is connected.
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