Alarm level 1 should result in control measures while alarm level 2 should be regarded as an emergency alarm.
When forwarding alarms to local emergency services, we recommend
using two detectors at alarm level 3 in order to avoid false alarms.
Alarm level 2 should result in flashlight and/or audible alarm at the
Flashlight should be used for alarm level 1.
Outdoor Gas Monitoring
Since recommendations on monitoring always depend on the
circumstances in the various specific cases, one must always
evaluate the effects of gas monitoring.
detector placement consider the following:
All pieces of equipment connected to the
object that are considered to be potential leak sources inside
buildings/sheds should be monitored.
Sometimes special consideration must be
taken to local residents or other factors where the slightest
prescence of gas is undesirable.
Plants have sometimes been built so that not
even strong winds could have prevented a certain accumulation of
flammable gas around the alarm object.
The advantage of creating a special alarm area is that alarms
from the gas monitoring unit can be obtained at a very early stage.
The disadvantage of creating a special
alarm area is that explosive gas concentrations can build up in here.
With no special alarm area, explosive gas concentrations might not
Choice of Equipment
The Stand-alone detector Combi is a detector
where power supply, alarm and control functions are integrated in
the detector housing. This detector is used where very simple
systems are sought and only few monitoring points are desired.
Analog detector APET,
Analog detector APET,
Gas alarm plate for gas detector
Combined warning horn/flashlight
The multipoint system equipped with an
instrument for gas monitoring is based on detectors providing a
gas leak unit with a signal related to the gas concentration.
The signal is then processed in the gas leak unit where measurements,
alarms and control functions are obtained.
most common gas leak unit is of this type and the CGD model is used
for several measuring points.
Disconnect the sensor cable and unscrew
the disused sensor head.
Exchange the sensor cartridge (3) and
connect the cable of the new sensor head to the PCB.
Close cover of the housing with the
screws (1). The recalibrated sensor is ready for use at once.
Electrical products in an explosive environment
A small amount of energy - a flame, spark, high surface temperature
or similar is required to ignite an explosive gas mixture.
Products installed in an area with a potential explosion hazard must
of course in themselves not be a potential explosion hazard.
For this reason, the products are manufactured in such a way that
this cannot occur.
The equipment must also be labeled and tested - ATEX classified - by
the approved testing authority.
The Ex-class information is available in "Swedish Standard" The choice of which Ex-classification is required is determined
by factors such as type of gas, permissible maximum surface
temperature and potential explosive hazards in the area where the
products are to be installed.
The potential explosion hazard in the different areas is determined
by the zone classification according to "Swedish Standard".
More about ATEX-products can be found in the following link