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Reference Manual
MAN-0091, Revision 8
2.6.2
Sensor separation distance
The maximum separation distance between the sensor and the transmitter is limited by the resistance
of the connecting wiring, which is a function of the gauge of the wire being used. It is recommended
that sensor separation must not exceed 2000 feet (610 meters) while using 16AWG (1.31mm
Refer to
2.6.3
Installation to transmitter or junction box
The SC311 sensor is supplied with a 3/4" NPT male conduit connection and is intended to be mounted
directly to an available 3/4" NPT conduit entry on a Millennium II Transmitter or remotely using a
certified junction box. There is an available offering of certified junction boxes designed specifically to
work with this sensor. Please contact your local Emerson Process Management representative for
further information.
2.6.4
Sensor wiring
Do not open the transmitter, sensor, or junction box enclosure when in a classified area or when an
explosive atmosphere may be present unless the power to the sensor has been removed.
When connecting cable wires, use a small flathead screwdriver to gently press down and hold the
spring connector open. Insert the appropriate wire into the open connector hole, releasing the
screwdriver to secure the wire. Refer to
Figure 2-5 Terminal connection
Connect the sensor wires to the Millennium II Transmitter or junction box as per the appropriate
transmitter or junction box manual. Figure 2-6 outlines the connections to a M21 Millennium II
transmitter.
Table 2-1 Sensor wire colors and terminal definition
Wire color
White
Marking
+Vdc
Function
10.5-32 Vdc
Connection
Installation
0
for wire gauges and resistance values.
Table 2-1
outlines the wire colors and their purpose.
Red
Sig A
Communication
signal A
Figure 2-5
below.
Blue
Sig B
Communication
signal B
Installation
Black
COM
Common / supply
Earth ground
ground
June 2016
2
) wire.
Green
7
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