Rosemount 848T, Справочное руководство

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Reference Manual
00809-0100-4848, Rev AA
July 2009
Rosemount 848T Wireless
3-8
4. Pull the wiring through the threaded conduit entry of the 848T.
5. Attach the sensor wiring to the terminals as indicated on the wiring
diagram Figure 3-4 on page 3-4. Note that Terminal Screw 5 is for
attaching the shield wire of the sensor to the device. See “Grounding
Practices” on page 3-10 for more information.
6. To connect the power module, remove the plastic plug from the
receptacle and discard.
7. After initial installation, close the housing cover securely. Always
ensure a proper seal by installing the electronics housing cover so
that metal touches metal, but do not over tighten.
8. Position the antenna
vertically
. The antenna should be
approximately three feet (1 m) from any large structures or buildings
to allow clear communication to other devices.
4–20 Milliamp Inputs
This section details the wiring and configuration of the Rosemount 848T
Wireless transmitter to monitor a 4 – 20 mA signal using the S002 option
code. This technique is used to capture data from a 4 – 20 mA device that
does not have a connection to traditional loop control or monitoring system.
The 848T measures millivolt signals, to monitor a 4 – 20 mA signal there must
be a conversion to millivolt using a 5 Ohm resistor to create a 20 -100 mV
signal. It is optimal to use a 5 Ohm resistor with stable operation over the
ambient temperature range where the 848T is located. See Figure 3-9 below
for information on wiring.
Plastic Plug