12
8008250/1F7Y/V4-0/2022-06 | SICK
O P E R A T I N G I N S T R U C T I O N S | GM901
Subject to change without notice
2
FOR YOUR SAFETY
2.7
Protection against hazards through gases
2.7.1
Protective measures against escaping gases
▸
Wear protective clothing and a protective mask in the case of hot and/or aggressive
measuring gases or high dust loads.
▸
Never open the enclosure or switch off the purge air feed without taking appropriate
protective measures when the duct is pressurized.
2.7.2
Noxious gases in device/module
2.7.3
Hot gases in ambient conditions with overpressure
●
Purge air unit (SLV4)
2.7.4
Behavior after purge air failure
Certain configurations of the GM901 measuring system demand immediate or short term
measures to protect the measuring system should the purge air supply fail.
WARNING:
Health risk through contact with toxic gases
The modules and devices contain enclosed potentially dangerous gases that can escape
due to a defect or leak. See Table
“Maximum gas amounts in SICK devices”
for these
gases.
Should a leakage occur, the concentrations inside the closed device could rise to a
certain concentration. These concentrations are also shown in this Table.
▸
Check the condition of the seals on the device/module regularly.
▸
Only open the device when good ventilation is available, especially when a leak of
one of the device components is suspected.
Table 1: Maximum gas amounts in SICK devices
Equipment/
module(s)
Gases
Max. total
amount (ml)
Max. concentration inside the device
when leaks occur (defect)
GM901
CO
10 ml
350 ppm
WARNING:
Risk of fire through hot gas escaping in installations with
overpressure conditions
On installations with overpressure, the purge air hose can be severely damaged by
escaping hot gas and can catch fire depending on the temperature.
On plants with overpressure and gas temperatures over 200 °C at the same time:
▸
Ensure reverse flow is prevented by fitting a (trip) flap or a valve.
▸
Regularly check the functionality of the reverse flow safeguard.
