DURAG D-R 290, Operating Manual

Page: 67 / 202

5 | Installation
D-R 290 67
●
in the terminal compartment of the D−TB 100 supply unit via a terminal strip in ac­
cordance with the connection diagram (see Fig. 5.35 ). The respective connection
diagram can also be found within the supply unit.
The cables for the mains and data cables should be routed separately.
The mains supply cable should use H 07 RR – U 3 G 1.5 or the equivalent. The mate­
rial of the conductors and sheath must be appropriate to the conditions at the operat­
ing site. To protect the supply conductor, a 16 A automatic circuit breaker should be
installed as near to the measuring system as possible. Label the MCB so that it can be
identified as the isolation switch for the device. The individual conductors of the mains
power supply cable must be mutually secured (e.g. using cable ties) in such a way
that they cannot touch neighbouring terminals whilst being disconnected.
(see also the technical data 9.2.5 D-TB 100 supply unit (terminal box) [
}
181] ).
Even when the plant is switched off there remains the danger of the
measuring head and reflector overheating.
Note that:
▶
The purge air supply must continue to operate even when the plant (for which the
dust emissions are to be measured) is switched off!
▶
The purge air supply must remain switched on at all times as long as the measur­
ing head and reflector are installed at the measuring point and exposed to the hot
gas to be measured.
▶
Fail-safe shutter (optional) if installed offer only short-term protection.
The cabling between the supply unit and the customer interface ( PLS [
}
196] ) in the
control room must be carried out with screened data cables; e.g. LiHCH (TP)
8 x 2 x 0.5 mm², with twisted pairs of fine-wire flexible cores, operational capacitance
approx. 80 nF/km.
Connect
one end of the screen in the supply unit.
Instructions for selection the device variant and measuring point
The technical requirements posed by various types of boilers or dust extraction plants,
stacks flue gas flues are very varied. The wall thickness and flue stack diameter can
affect the choice of system variants. Refer to the sections 4.3.1 Possible system con­
figurations [
}
51] and Fig. 5.1 .
As a general principle it is recommended that the location of the measuring point is
performed by the responsible measuring institute (e.g. TÜV). In addition, consideration
must also be given to the intended measuring point:
●
feasibility of installation of the reflector
●
feasibility of installation of the purge air unit(s)
●
if necessary, feasibility of installation of the fail-safe shutter
●
clearance to swing out the measuring head and reflector.
●
if installed outdoors, the space required for weather protection covers for the
measuring system and purge air unit(s).
●
A duct that runs vertically is preferable to one that runs horizontally.
5.2.3