Installation
Dräger Polytron 5100
9
3
Installation
3.1
General information for installation
To ensure overall system performance and effectiveness, the
selection of an installation site for the instrument is one of the
most important factors. Strict compliance where possible and
considerable thought must be given to every detail of
installation, particularly:
z
the local, state, national codes and regulations that govern
the installation of gas monitoring equipment.
z
the electrical codes that govern the routing and connection
of electrical power and signal cables to gas monitoring
equipment.
z
for non-conduit installations, an approved cable gland must
be used, see Section
9.1 on Page
27 (e.g. Hawke A501/
421/A/¾” NPT or equivalent). It might be necessary to
connect the shield of the cable to the cable gland and to the
controller in order to improve RFI immunity.
z
the full range of environmental conditions to which the
instruments will be exposed to.
z
the physical data of the gas or vapor to be detected.
z
the specifics of the application, (e.g. possible leaks, air
movement/draft, etc.).
z
the degree of accessibility required for maintenance
purposes.
z
the types of optional and accessory equipment that will be
used with the system.
z
any other limiting factors or regulations that would affect
system performance or installations.
z
the flameproof / explosion proof enclosure provides three
¾" NPT openings, which can be used for field wiring, direct
attachment of a sensor or wiring of a remote sensor.
z
unused openings must be closed with a plug. For correct
tightening torques of conduit hubs, cable glands, plugs and
sensor see Section
9.8 on Page
28.
z
secondary circuit intended to be supplied from an isolating
source (N/A for relay circuits).
z
the optional increased safety terminal box provides up to
four 20 mm openings, which can be used for field wiring or
wiring of a remote sensor. The permissible cable diameter
range is 7
to
12
mm.
z
when installed at locations exceeding ambient
temperatures of 55
°C, use only appropriate wiring,
specified for at least 25
°C above the maximum ambient
temperature.
z
strip wire insulation by 5 to 7 mm.
z
connect the wires as indicated in wiring figure Section
3
on
Page
9 (also showing grounding conductor terminal).
z
the wiring for the optional relay module must be selected
and fused according to the rated voltages, currents and
environmental conditions.
z
if stranded conductors are used, a ferrule must be used.
3.2
Installation restrictions
The instrument must have between 10 or 18 to 30 VDC at the
instrument (see Section
9.4 on Page
27).
This
ultimately
determines the distance the instrument can be mounted from
the controller or power supply. The instrument accepts wire
sizes of 12 to 24 AWG (0.2 to 2.5 mm
2
). Depending on the
configuration, use at least a two or three-conductor, shielded
cable.
The instrument must not be exposed to radiant heat that will
cause the temperature to rise beyond the limits stated in see
Section
9.6 on Page
28. The use of a reflecting shield is
recommended.
The enclosure is weatherproof within environmental
specifications and suitable for outdoor installation. The use of
the optional splash guard (part number 6812510) is
recommended to protect the sensor from water and dust.
Each instrument must be installed and operated in an
environment that conforms to the specifications, see Section
9
on Page
27.
i
i
NOTICE
The instrument may be equipped with a dust plug at
the conduit entry. This plug is not explosion proof nor
meant to be watertight and must be removed before
connecting the instrument to a sealed conduit or
installation of a flameproof cable gland.
www.norrscope.com
