Instruction manual

RFT9739 Field-Mount Transmitter Instruction Manual 15
Output Wiring Startup TroubleshootingBefore You Begin Getting Started Mounting
Power-Supply and
Sensor Wiring
4 Power-Supply and Sensor
Wiring
4.1 General guidelines
A removable partition on the electronics module keeps intrinsically safe
wiring to the sensor separated from nonintrinsically safe output wiring.
The module has a hinged, clear plastic cover. To access power-supply
wiring terminals, unlatch the cover of the module, then remove the
partition.
•
Figure 4-1
, page 16, shows the locations of the terminals for wiring to
the sensor, output wiring terminals, and power-supply wiring terminals.
• Terminal blocks may be unplugged from the module for easier
installation of wiring.
• Install cable and wiring to meet local code requirements.
• A switch may be installed in the power-supply line. For compliance with
low-voltage directive 73/23/EEC, a switch in close proximity to the
transmitter is required for AC-powered transmitters.
• Do not install AC power cable or unfiltered DC power cable in the same
conduit or cable tray as sensor cable or output wiring.
WARNING
Failure to comply with requirements for intrinsic
safety in a hazardous area could result in an
explosion.
Sensor wiring is intrinsically safe.
• Keep intrinsically safe sensor wiring separated from
power-supply wiring and output wiring.
• For intrinsically safe sensor installations, use this
document with Micro Motion UL, CSA, or SAA installation
instructions.
• For hazardous area installations in Europe, refer to
standard EN 60079-14 if national standards do not apply.
• Make sure the safety barrier partition is in place before
operating the transmitter.
CAUTION
Failure to seal transmitter housing and sensor
junction box could cause a short circuit, which would
result in measurement error or flowmeter failure.
To avoid risk of condensation or excessive moisture in the
junction box or transmitter housing:
• Seal all conduit openings.
• Install drip legs in cable or conduit.
• Ensure integrity of gaskets and O-rings, and fully tighten
all covers.