Installation; Typical Location & Positioning - CGS Merlin 'S' Range Installation, Fonctionnement Et Entretien

Installation, Operation & Maintenance Manual

Installation

Typical Location & Positioning
Our detectors should be installed in safe areas only at risk of gas leaks e.g. over boilers, valves or meters. Take in to
account the design of the air flow patterns within the zone area.
Detectors should be installed in the correct orientation, as recommended, and ease of access should be accounted
for to allow for any servicing, recalibration and other forms of maintenance.
Consider the coverage required, application and function of the area. Emphasis should be placed on airflow patterns,
correct placement and not perceived detection ranges. The target gas will only be identified when contact is made
with the sensing element itself.
Maximum Gas Detectors per Merlin Panel
Merlin 'S' Range 1 Detector
Merlin GDP2 6 Detectors (2 Zone Panel – LED Indication)
Merlin GDP4 12 Detectors (4 Zone Panel – LED Indication)
Merlin GDP2X 8 Detectors (2 Zone Panel – Digital Indication)
Merlin GDPX+ 16 Detectors (4 Zone Panel – Digital Indication)
Avoid conditions of any other environmental factors that could potentially impede the accuracy and operation of the
detectors such as; condensation; vibration; temperature, pressure, the presence of other gases, electromagnetic
interference and draft/splash zones i.e. doors, fans, sinks, ovens etc.
Locations for detectors will vary based on the intended application and target gas, they should be located near
identified sources of a potential gas leaks/pockets where gas could quickly accumulate and areas of identified
consequential risk to detect gas. The composition of the target gas and its density relative to air are used as the basis
for the recommended height of sensors. Generally, the installation height of a sensor for a heavy gas (such as
propane) would be close to the lowest point in the area, and for a light gas (such as methane) would be close to the
highest point in the area. These recommended heights may vary based on air flow and temperature conditions in
addition to the proposed application and location – this is particularly apparent with oxygen depletion sensors, and the
target gas that they are used for.
Target Gas
Natural Gas/Methane (NG)
Liquid Petroleum Gas (LPG)
Carbon Monoxide (CO)
Hydrogen (H)
Oxygen (O )
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* If you are installing and monitoring Oxygen depletion – consider the density of gas for its application and position
the detector accordingly i.e. ground level for high density gases.
The detectors are designed around a centralised control panel of which the location also needs to be considered.
The control panel should be located away from the area that it is monitoring and accessible is for both status
observation and alarm purposes.
Where cable runs may exceed 100 yards from a control panel – Contact your supplier!
IOM Iss: 4 11-21
Typical Position
High Level - 300mm (1ft) from ceiling
Low Level - 300mm (1ft) from ground level
Breathing Zone - 1700mm (5ft 6") from ground level
High Level - 300mm (1ft) from ceiling
*Breathing Zone - 1000-1500mm (3 - 5ft) from ground level
Merlin Detector-TFT
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