Emerson Net Safety ST3, Справочное руководство

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2.6 Wiring
2.6.1 Field installation
WARNING
Electrical shock
Failure to follow these installation guidelines could result in death or serious injury.
Ensure that only qualified personnel perform the installation.
Electrical shock could cause death or serious injury.
Use extreme caution when making contact with the leads and terminals.
Do not open the transmitter, sensor, or junction box enclosure when in a classified area
or where an explosive atmosphere may be present unless the power to the transmitter
and sensor has been removed.
Note
Wiring codes and regulations may vary. Wiring must comply with all applicable regulations
relating to the installation of electrical equipment in a hazardous area and is the
responsibility of the installer. If in doubt, consult a qualified official before wiring the
system.
When separating the sensor from the transmitter, Emerson highly recommends using
shielded cable to protect against interference caused by extraneous electrical or
electromagnetic noise. To meet EN50270:2006 requirements, follow the
recommendations on cable choice and guidelines as outlined in the
Net Safety Millennium
II Transmitter Reference Manual or Net Safety Millennium II Basic Reference Manual . In
applications where the wiring is installed in conduit, do not use the conduit for wiring to
other equipment.
2.6.2 Sensor separation distance
The resistance of the connecting wiring, a function of the gauge of wire being used, limits
the maximum separation distance between the sensor and transmitter.
Net Safety recommends that sensor separation does not exceed 2000 ft. (610 m) while
using 16AWG (1.31 mm
2
) wire. Refer to Wire resistance table for wire gauges and
resistance values.
2.6.3 Install to transmitter or junction box
Emerson supplies the Net Safety ST3 with a ¾ -in. national pipe thread (NPT) male conduit
connection. Mount the sensor directly to an available ¾ -in. NPT conduit entry on a Net
Safety Millennium II Transmitter or remotely using a certified junction box.
Net Safety has an available offering of certified junction boxes designed specifically to
work with this sensor. Please contact your local Net Safety representative for further
information.
Reference Manual Install
00809-0100-4303 November 2020
Net Safety ST3 15