Installation
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optek-Manual--1004-2006-02--TF16-US-2011-06-20
www.optek.com
6.3 Air purge
Should the temperature of the process medium be too low, the temperature of
the air inside the optical housing might fall below dew point. This leads to
condensation deposits on the window surfaces. For this event, the sensor body
is equipped with an air purge connection on a window ring or the sensor is as
well equipped with one air purge connection on the detector assembly.
Note!
If the product is more than 10 °C (18 °F) cooler than the ambient air of the
sensor, always connect air purge.
Tool • Screw driver
• Wrench 7 mm
At delivery, the drill holes of the air purge connections are sealed with O-Ring
and sealing screws M5 x 6 (DIN 84).
1. Remove the sealing screws and O-Rings.
2. Check if there are O-Rings on air purge connections.
3. Install air purge connections (22, fig. 10) screwing.
4. Place the air purge hoses on the air purge connections (22).
Fig. 10 Window ring and detector assembly air purge connections (left) as well as optical housing
and detector assembly air purge connections (right)
After connecting the sensor to the power supply and putting it into operation,
rinse it as described below:
1. Loosen lamp adapter (4) and detector assembly (14) turning each 2-3 turns
anticlockwise.
2. Rinse the optical housing by aerating it with dry, oil and dust free air for
approx. 10 minutes at a maximum of 0.5 bar (7.25 psi) gauge pressure.
In case you do not have air purge supply of appropriate quality, you can use
the optek Air Drying System ADS.
3. Reduce air pressure to approx. 0.1 bar (1.45 psi).
4. Retighten lamp adapter (4) and detector assembly (14). Keep up the gauge
pressure. Air consumption in this operational state is minimal.
5. Make sure the O-Rings are fitted correctly.
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