Mounting The Gas Detector; Warnings And Prerequisites; Mounting Locations; General Placement Guidelines - Emerson MRLDS-250 Installation And Operation Manual

2 Mounting the
Gas Detector
2.1. Warnings and
Prerequisites
WARNING: Explosion hazard! Do not mount
the MRLDS-250 in an area that may contain
flammable liquids, vapors, or aerosols.
Operation of any electrical equipment in such
an environment constitutes a safety hazard.
CAUTION: The MRLDS-250 contains
sensitive electronic components that can be
easily damaged. Do not touch or disturb any of
these components.
NOTE: The mounting location of the monitor
should allow it to be easily accessible for visual
monitoring.
NOTE: The monitor must be connected to a
marked, suitably located and easily reached
switch or circuit breaker as a means of
disconnection.
CAUTION: Connect monitor power and sig-
naling terminals using wiring that complies
with local ethical codes or regulations for the
intended application.
CAUTION: Do NOT mount the MRLDS-250
directly to vibrating machinery as the
vibrations may degrade the gas detector's
performance.
4 • MRLDS-250 Gas Detector Manual

2.2. Mounting Locations

2.2.1. General Placement Guidelines

NOTE: The MRLDS-250 should be installed
plumb and level and securely fastened to a
rigid mounting surface.
NOTE: When installed in areas that may be
subjected to water spray, the optional splash
guard (P/N 603-1100) should be used in
conjunction with the MRLDS-250.
Gas detectors must be located within the
appropriate wire lengths from the central control unit
(if used).

2.2.2. Machinery Rooms

There is no absolute rule in determining the
number of gas detectors and their locations. However,
a number of simple guidelines can help in making a
decision. Gas detectors monitor a point as opposed to
an area. If the gas leak does not reach the detector, no
alarm will be triggered. Therefore, it is extremely
important to select the gas detector location carefully.
Also consider ease of access for maintenance.
The size and nature of the site can help in deciding
which method is the most appropriate to use.
Locations requiring the most protection in a
machinery or plant room would be in close proximity
to compressors, pressurized storage vessels,
refrigerant cylinders, storage rooms, or pipelines. The
most common leak sources are valves, gauges,
flanges, joints (brazed or mechanical), and filling or
draining connections.
• In machinery rooms where there is little or no
airflow, placement options are:
• Point Detection: where gas detectors are located as
near as possible to the most likely sources of
leakage, such as the compressor, expansion valves,
mechanical joints, or cable duct trenches.
• Perimeter Detection: where gas detectors
completely surround the area or equipment.
026-1315 Rev 2 11-APR-2017