DURAG D-R 290, Operating Manual

Page: 25 / 202

2 | Safety
D-R 290 25
NOTICE Damage to electronic components due to electrostatic discharge (ESD)
Electronic components are becoming ever smaller and more complex. Their
susceptibility to damage from electrostatic discharge is increased accordingly. To
protect these components, measures must be undertaken to prevent electrostatic
discharge during all work performed on the open device (ESD protection).
To prevent the human body becoming charged with static electricity, service
employees can for example be equipped with a personal earthing system.
Hazard due to hot, aggressive or explosive gases or high pressure
of the measuring gas
Measurement and reflector units are directly mounted on the duct carrying the gas to
be measured. If these devices become detached from the flange tube, gas can es­
cape from the duct through the flange connection, particularly in the event of overpres­
sure, and cause serious damage to health if maintenance personnel are unprotected.
Therefore, before releasing the flange connection, always take appropriate protective
measures, e.g. close the quick-release clamp and secure it against unintentional
opening, wear protective clothing etc. The operator must also erect the relevant warn­
ing signs.
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.
The exhaust gas temperature must not fall below the dew point, to ensure that the
duct is free of condensed gas.
Particularly during start up / shut down of the system being measured, monitor the
changes in the temperature of the measured gas in relation to the dew point.
Hazard due to automatic closing mechanisms
When using the optional D-SK 290 fail-safe shutter:
WARNING High risk of injury due to sudden closure of the shutter
▶
Never insert fingers into the closing area of the fail-safe shutter.
▶
Before maintenance work:
Unplug the connection plug at the measuring head for the fail-safe shutter.
(Caution,
when the connection is broken, the fail-safe shutter closes very quickly)
2.6.2
2.6.3