ABB GAA330-M Operating Instructions Manual page 13

Gas flow
Sampling probe
Heated sampling line
Temperature controllers
Solenoid valve
Front panel
GAA330-M EMISSION MONITORING SYSTEM
The gas is extracted from the exhaust gas line after the scrubber by a heated
sample probe. The heated sampling line is the connection and supplying line
between sampling probe and analyzer cabinet. The probe and the sampling
line are heated to avoid condensation.
To clean the filters in the sampling probe a back-purging system via the
filter chamber can be integrated as an option. The filters are cleaned with
pressurized air every 8 hours cyclically or automatically when the flow is
below the minimum value.
At the entrance of the analyzer cabinet there is a 3/2-way solenoid valve. The
gas flow goes to the gas cooler and via filter, flow meter, pump and aqua
stop filter to the gas analyzer.
The sampling probe is connected gas tight to the process with a flange. The
probe pipe extracts the gas in the middle of the exhaust pipe. An external
heated filter separates the dust from the sampling gas.
The heating of the filter is controlled with a Pt100 resistance thermometer
and the power/temperature is adjusted with a temperature controller in-
stalled in the cabinet. The sinter filter is a ceramic filter. Normal temperature
is 180 °C. If the temperature is 20 °C below the set value an error signal is
generated.
The filter is cleaned by the back-purging system either every 8 hours cycli-
cally or automatically when required (option) or manually controlled.
The heated sampling line is directly connected to the head of the probe. The
core is a PTFE hose. The line is heated to 180 °C.
The temperature is controlled with a Pt100 resistance thermometer and the
power/temperature is adjusted with a temperature controller installed in
the cabinet. In case of a deviation from the set value a status signal is gen-
erated and displayed as an illuminated red lamp on the status signal board.
Temperature controllers are used to control the temperature of the sam-
pling probe and the heated sampling line. An alarm signal is output as soon
as the temperature drops below the minimum temperature limit.
A solenoid valve is installed to switch between measuring gas and ambient
air during calibration.
On top is the NDIR gas analyzer AO2020-Uras26. Below are the flow meters
which control the gas flow to the analyzer and the bypass. Depending on the
version of the system, there are two or four flowmeters.
Below, on the left side of the status signal board, are the main switch and
lighted pushbuttons as indication of activity of measuring point (green
lamp) and back-purging (orange lamp).
Next to these are the temperature controllers for sample probe and heated
line. Depending on the version of the system, there are two or four temper-
ature controllers.
The status of the system is indicated by the red LEDs on the right side of the
status signal board.
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