DURAG D-R 290, Operating Manual

Page: 79 / 202

5 | Installation
D-R 290 79
When laying the purge air hoses, note that:
Standard purge air hoses are designed for a maximum ambient temperature of
approx. – 25 to + 80°C. Temperatures outside this range compromise the reliability of
purge air provision.
Purge air hoses for other temperature ranges are available on request.
Do not bend the hoses in too tight a radius in comparison to the hose diameter (risk of
kinking, leading to: loss of purge air and irreparable damage to the measuring heads
due to overheating).
The hoses are not resistant to tension. Therefore:
▶
Do not hang the hoses in free loops under their own weight. Fit supports at reason­
able intervals.
▶
Do not use force, e.g. to drag them through narrow openings in walls.
▶
Do not use hoses as attachments or supports for other objects.
D Disc springs E Spherical washer
F Self-locking nut G Adjustment flange with tube
H Purge air flange
Fig. 5.11: Adjustable attachment
1. Place 12 disc springs (D) in alternate directions on each of the 3 threaded studs of
the flanged tube.
2. Switch on the purge air unit (for installation of the D-BL purge air unit see 5.8 In­
stallation of the purge air unit [
}
101] ff) and slide the purge air flange of the
measuring head or reflector connected to the active purge air supply on to the
threaded studs (5).
3. On each stud place a spherical washer (E - flat face towards the nut)
4. and on each stud only loosely tighten a self-locking nut (F) (final tightening is per­
formed as part of the optical adjustment; see section 6.1 Optical alignment
[
}
107] ).
5. Pull the rubber sleeve (6) over the space between the flanged pipe (3) and purge
air flange (11).
6. Use the connecting cable to make the connection between the measuring head
and the supply unit / control unit.
7. Align the measuring head and reflector to each other; see section 6.1 Optical
alignment [
}
107] .
Electrical connections to the measuring head
Depending on the configuration, the measuring head of the D−R 290 has up to a max­
imum of 5 connection plugs on the underside of the housing (see Fig. 5.12 ).
5.4.5