Ametek Thermox 2000 ATEX Series, User Manual

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3-24 | Thermox Series 2000 WDG-HPII / HPIIC - ATEX
Table 3-2.
Required sensor cable wiring
(minimum acceptable grades).
WDG SENSOR TYPE
NUMBER OF TWISTED
PAIRS NEEDED
GAUGE OF WIRE
WDG HPII (O2 only) 4
22 AWG (to 250 ft.)
18 AWG (250 to 1000 ft.)
WDG HPIIC (combustibles)
6 (to 40 feet)
8 (to 1000 feet – must use
remote sense)
18 AWG
General Wiring and Conduit Requirements
This section describes general wiring and conduit requirements:
• Sensor wiring conductors must be rated at a minimum of 80°C. All
other wiring conductor ratings should be for the minimum tempera-
ture required for the equipment being connected to the analyzer, but
not less than 60°C.
• Use only the applicable NEMA approved conduit fittings or cable fit-
tings to maintain the NEMA rating for the Series 2000 controller or
sensor enclosure. If not using a conduit entry, leave the factory NEMA-
approved plugs intact. Never leave any holes unplugged.
• Follow all applicable electrical codes for your location.
• Follow proper grounding, shielding and noise protection practices as
described in this section.
• Use twisted-pair cable with an overall braided shield, or twisted-pair
cable in rigid metal conduit for all sensor and signal wiring.
• For AC mains supply wiring, use between 12 and 14 American Wire
Gauge (AWG) or equivalent metric between 3.3 mm
2
and 2.1 mm
2
. For
all signal wiring, use 18 to 22 AWG (0.82 mm
2
to 0.33 mm
2
). Table 3-2
shows the required sensor cable types for various WDG-style sensors.
• Use the conduit entry point closest to the connections you are making.
Do not add any additional conduit entry holes!
• You may use 1" conduit with a 3/4" adapter at the entry to the Series
2000 controller for signal and sensor wiring.