Rockwell Automation T8841 Trusted 8 Channel RTD FTA - Manual

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