DALEMANS D-TEX3F+, Instruction Manual

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11
3. INSTALLATION
3.1. Positioning of the detectors
The gas detectors must be positioned such that any gas accumulation will be detected before it
creates a significant risk. The inappropriate positioning of a detector can cancel the effects and
integrity of the gas detection system.
The choice of position of the detectors must be determined in collaboration with specialists having
the required knowledge of gas dispersion, with people knowledgeable about the operation of the
installations and equipment concerned and with technical personnel and personnel involved in the
safety procedure. You can obtain more information or assistance by contacting DALEMANS or its
local representative.
The position of the detectors must be recorded and made available to safety personnel.
Please consider the following observations concerning the positioning of the detector:
▪
Access to the detector must be easy for maintenance and inspection operations.
▪
Allow sufficient space for the use of accessories required for these operations.
▪
The level of risk and potential gas sources must be considered.
▪
Consider possible combinations of gas sources and dissemination effects.
▪
The detector must be protected against risks related to the operation of the installations.
▪
The detector must be protected against vibrations and the risks of mechanical impacts.
▪
Never place the detector directly above or below a water source.
▪
For external placement, use protection against rain and/or the sun.
▪
Do not install the detector in an air flow.
▪ The detector’s usage temperature must always be respected (see “Specifications”).
▪
To detect gas lighter than air, place the detector close to the ceiling.
▪
To detect gas heavier than air, place to detector close to the floor.
▪
If the density relative to the gas to be detected is close to that of the air (air density = 1), place
a detector close to the ceiling and another one close to the floor.
▪
The density of a gas increases when the ambient temperature increases.
▪
For the inst
allation of a detector at height, DALEMANS recommends the use of the “
Collector
cover D•LINE”
(see "Spare parts and accessories
”).
Below are some examples of detector positions depending on the gas to be detected:
Gas* Formula Density (air = 1) Position
Cracked gas - 0.47
High
Natural gas - 0.68
Methane CH
4
0.55
Butane C
4
H
10
2.05
Low
Propane C
3
H
8
1.56
* Non-exhaustive list