DURAG D-R 290, Operating Manual

Page: 77 / 202

5 | Installation
D-R 290 77
For installation of the purge air blower see 5.8 Installation of the purge air unit [
}
101] .
Installation of fail-safe shutters offers effective protection against damage during a
short loss of purge air supply. The D−R 290 measuring system is designed optically
and mechanically so that a D‑SK 290 protective device (fail-safe shutter) can be instal­
led between each welded-in pipe and the measuring head or reflector. The installation
of these fail-safe shutters allows the path between the measuring device and the flue
gas to be closed mechanically in the event of a fault (power supply failure or purge air
failure). This protects the measuring device until the failure has been rectified.
When installing fail-safe shutters, please observe the installation sequence described
for them (see section 5.5.1 Installation sequence for the measuring head and reflector
(when the D-SK 290 protective device is used) [
}
84] .
WARNING Danger of burns due to hot surfaces!
Contact with hot components can cause serious burns.
▶
Suitable heat-resistant protective gear (such as face mask, safety gloves) must al­
ways be worn where any work is undertaken in the vicinity of hot components.
▶
Wherever possible, allow components to cool down to ambient temperature before
starting work.
Wherever possible, install or remove components only when the plant is shut down.
Before opening the duct access ports:
●
Make sure that no overpressure is present in the measurement duct.
●
Make sure that no toxic gases are present in the measurement duct.
If it is not possible to shut down the plant, and toxic gases, which may be at high tem­
perature or pressure, are present in the measurement duct:
WARNING Health hazard due to hot and/or toxic gases in the duct!
When a duct access port (such as a welded-in tube) is opened, pressurised gases
may escape.
▶
Always wear suitable protective equipment (such as a face mask, heat-resistant
gloves and clothing, protective breathing equipment).
▶
The applicable specifications safety regulations and the operating company work­
ing instructions for the plant must be complied with.