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D-FL 200 / Rev. 6
23
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Industrie Elektronik GmbH & Co KG
9.2. Installation of the purge air system
The installation of the purge air system is done according section
3.3. Purge Air System, page 9. The
best place for the purge air fan is either in the centre of the two sensors or near the lower sensor.
Finally the hoses should be attached. Consider that you should use special acid-resistant hoses if there
is aggressive gas or gas below the dew point. Before installing the measuring heads you must finish
the electrical connection of the purge air system.
9.3. Installation of the sensor units D-FL 200-MK
The measuring heads are mounted according to the next figure. The red indication dots have to be
directed upwards on a vertical stack, on a horizontal duct they should be in direction of the flow. The
sensor A is transmitting downstream, the sensor B upstream (when four sensors are used the sensor
A is equivalent to C and sensor B is equivalent to D). The sensors are all the same, the indication with
A to D is only necessary to connect the sensors in the right order to the evaluation unit. If the
temperature of the gas is higher than 120°C (248°F) or there is aggressive gas, permanent purging is
necessary to protect the sensor. This is also necessary if the sensor is not in operation.
(Fig. 21) Recommended installation of the D-FL 200 welding flanges
9.4. Installation of the evaluation unit D-FL 200-10
The evaluation unit should be installed at an open place. The required mains voltage is stated on the
device-plate. The standard cable length between evaluation unit and sensor is 15 m (49 ft), the
maximum length is limited to 50 m (164 ft). You should always use the shielded cable enclosed with
the sensor. The sensor unit A has to be connected to the terminal strip
(Fig. 16) Terminal strip on the
housing, page
14 connector 22-26, the sensor B to connector 27-31 (sensor C and D according
connection C and D to the figure). The shield of the cable should have a good electrical connection to
the metal cable holder.