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Rockwell Automation T8841 Trusted 8 Channel RTD FTA User Manual

Sds-8841 trusted, Industrial control system trusted

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SDS-8841
Trusted

TM

Industrial Control System

Trusted

TM

8 Channel RTD FTA -T8841

Issue 5 Jan 2006

ASSEMBLY

DESCRIPTION


The Trusted

TM

RTD Field Termination Assembly (RFTA) provides an

interface between a Trusted

TM

system and up to eight Platinum 100R RTD

sensors which may be connected using two or 3-wire configurations.

Each RFTA channel may be configured to provide either a scaled current
output in the range of 4-20mA, or a scaled voltage output in the range of
1-5V dc. The RFTA also provides sensor excitation and linearisation for
each channel.

The temperature measurement channels of the RFTA each consist of a
precision RTD instrumentation amplifier based on the Burr Brown XTR105
device. The device is a monolithic 4-20mA, 2-wire current transmitter with
two precision current sources. It provides complete current excitation for
Platinum RTD temperature sensors and bridges, an instrumentation
amplifier and current output circuits on a single integrated circuit.

The amplifier gain may be configured for a wide range of temperature
measurements. Total unadjusted error of the complete current transmitter is
low enough to permit use without adjustment in many applications. This
includes zero output current drift, span drift and non-linearity.

Each circuit contains configuration links allowing user selection of
temperature range and selection between two and 3-wire sensor types.

The RFTA is designed to be mounted on either of the TS32 or TS35 DIN
rails in the horizontal or vertical position as required.

FEATURES

Eight input channels per
RFTA

Industry standard field
device connections (2 and
3-wire)

Standard DIN rail
compatibility

Simple installation and
connection

24V dc operation

Configurable 2 or 3-wire
inputs

Configurable current or
voltage output