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6-2 How to Install the Gas Detector
(1) Suction type gas detector
Use Suction type gas detector head in a location where is hard to access for maintenances such as inside a Pit or
Duct as well as a location where the gas detector head could be watered.
Installation
The gas detector must be handled with care to avoid damaging the explosion proof construction.
Do not install the Gas detector in locations listed below:
-Location where the ambient temperature may drop lower than –10
℃
or exceed 40
℃
.
-Location where dew condensation may occur.
-Location where it could be exposed to direct water.
-Location where corrosive gases may exist.
-Location where get sunshine directly.
-Location where the ambient temperature could change drastically.
-Location where nearby a source of electrical noises.(high frequency, magnetic noises)
Do not install the Gas detector in an atmosphere contaminated with silicon compounds, as silicon could
poison and/or impair the sensitivity of the sensor.
The gas detector should be installed in a location free from vibration.
Avoid severe shocks and /or mechanical impact to the gas detector.
When the gas detector is to be installed in an outside location, make sure to use a rain protective cover or
cap.
Use Auto drain function (optional item) when use the Suction type detector in a location where the detector
could be watered.
The height of the installation of the detector head is an important factor and related to the gas to be
detected, refer to table below.
Kind of gas
Installation height
Remarks
Gases heavier than air ,such as
LPG
About 10cm above the
floor level
For maintenance purpose allow at
least 7cm space from floor level
Gases lighter than air, such as
H2,CH4,town gas, natural gas.
Near the ceiling
Select a location where maintenance
can be easily conducted.
CAUTION
Fig.9 Diffusion type gas detector head
Areas where gases tend to reside
Detector heads
Roof fan
Air intake
Window
(Side view)
(Plain view)
Detector head to be installed
