Instruction manual

RFT9739 Field-Mount Transmitter Instruction Manual 25
Output Wiring Startup TroubleshootingBefore You Begin Getting Started Mounting
Power-Supply and
Sensor Wiring
5 Output Wiring
5.1 General guidelines
A removable partition on the RFT9739 electronics module keeps
intrinsically safe wiring to the sensor separated from nonintrinsically safe
output wiring. Use the upper and lower blocks on the right side of the
partition for output wiring connections.
Figure 5-1
and
Table 5-1
(next
page) describe terminal designations for the output terminals. Terminal
blocks can be unplugged from the module for easier installation of wiring.
• The RFT9739 has separate conduit openings for power-supply wiring
and output wiring.
• To avoid possible electrical interference, do not install output wiring in
the same conduit or cable tray as sensor cable or power-supply wiring.
• Use individually shielded pairs of 22 AWG (0.3 mm²) or larger wires for
connections between the RFT9739 and any peripheral device.
• Shields and/or drain wires must be terminated outside the transmitter
housing, or left floating, as required by the installation.
• To comply with CENELEC standards for hazardous area installations in
Europe, nonintrinsically-safe connections between the RFT9739 and
other devices may
only
be made to devices that maintain a voltage
less than or equal to 250 V.
5.2 Maximum wire length
Currently, there is no system for accurately estimating the maximum
length of wire between the RFT9739 and a connected peripheral device.
Most applications will be able to use wire lengths up to 500 feet for
22 AWG wire (150 meters for 0.3 mm² wire), 50 feet for 28 AWG wire
(15 meters for 0.1 mm² wire), between the transmitter and any
peripheral device. However, these distances are estimates only.
Prior to commissioning the transmitter, a loop-test is recommended as a
means for determining whether or not output signals are being received
correctly at the receiving device.
WARNING
Failure to comply with requirements for intrinsic
safety in a hazardous area could result in an
explosion.
Output wiring is not intrinsically safe.
• Keep output wiring separated from power-supply wiring
and intrinsically safe sensor wiring.
• Follow all output wiring instructions to ensure transmitter
and any connected devices will operate correctly.
• Make sure the safety barrier partition is in place before
operating the transmitter.