3b34-03 Analog Devices, Inc., 3b34-03 Datasheet

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3b34-03

Manufacturer Part Number
3b34-03
Description
Isolated, Linearized Rtd Input
Manufacturer
Analog Devices, Inc.
Datasheet
FEATURES
Isolates, amplifies, linearizes, & protects analog input
voltages from a wide variety of two-, three- and four-wire
Resistor Temperature Detectors (RTDs).
Module provides a constant +10V bridge excitation voltage.
Module provides simultaneous precision voltage and
current outputs linear to input temperature.
RTD excitation current and three-wire lead resistance
compensation provide a complete signal conditioning
solution.
Module circuitry can withstand 220v rms at the input screw-
terminals.
All 3B34 series modules are mix-and-match and Hot
Swappable.
APPLICATIONS
Industrial signal conditioning
Industrial signal isolation
Industrial signal filtering
PRODUCT OVERVIEW
The 3B Series of Signal Conditioning I/o Subsystems provide a
low-cost, versatile method of transferring analog transducer
signals to a data acquisition, monitoring or control system
without the inherent noise, non-linearity, drift and extraneous
voltages. The modules are designed to directly accept analog
signals from Thermocouples, RTD’s, AC and DC Strain Gages,
Torque Transducers, Frequency Transducers, LVDTs, millivolt
or process current signals. The modules amplify, isolate,
linearize and convert the transducer output signals to
standardized analog inputs for high-level analog I/O
subsystems. The 3B Series Subsystem consists of a 10” relay
rack with universal mounting backplane and a family of plug-in
(up to 16 per rack) input and output signal conditioning
modules.
Eight and four channel backplanes are also available. Each
backplane incorporates screw terminals for sensor inputs and
current outputs and a 26-pin connector for high-level single-
ended voltage outputs to the user’s equipment.
The input modules feature complete signal conditioning
circuitry optimized for specific sensors or analog signals and
provide two simultaneous high-level analog outputs: 0 to +10V
(or +10V) and 4-20 mA (or 0-20 mA).
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
Output modules accept 0 to +10V (or +10V) single-ended
signals and provide an isolated 4-20 mA (or 0-20 mA) process
signal. All modules feature a universal pin-out and may be
readily hot-swapped under full power and interchanged without
disrupting field wiring.
The Analog Devices 3B Series Signal Conditioning Subsystem is
designed to easily handle signal conditioning problems in
measurement and control applications. Some typical uses are in
microcomputer-based data acquisition systems, programmable
controllers, analog recorders, dedicated control systems, and any
other applications where monitoring of temperature, pressure,
flow and analog signals are required. Since each input module
features two simultaneous outputs, the voltage output can be
used to provide an input to a microprocessor-based data
acquisition or control system while the current output can be
used for analog transmission, operator interface, or an analog
backup system.
Each input module is a single-channel signal conditioner which
plugs into a socket on the backplane and accepts its signal from
the input screw terminals. All input modules provide input
protection, amplification and filtering of the input signal,
accuracy of +0.1%, low drift of +1 uV/
modules), and feature two high-level analog outputs that are
compatible with most process instrumentation. The isolated
input modules also provide +1500 V peak isolation.
The choice of a specific 3B module depends upon the type of
input signal. Input modules are available to accept millivolt, volt,
process current, thermocouple, RTD, AC and DC strain gage,
frequency and LVDT inputs. The voltage output of each module
is available from the sysem I/O connector while the current
output is available on the output screw terminals.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
Isolated, Linearized RTD Input
FUNCTIONAL BLOCK DIAGRAM
Figure 1. 3B34 Functional Block Diagram
© 2004 Analog Devices, Inc. All rights reserved.
o
C (low-level input
www.analog.com
3B34

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3b34-03 Summary of contents

Page 1

... RTD excitation current and three-wire lead resistance compensation provide a complete signal conditioning solution. Module circuitry can withstand 220v rms at the input screw- terminals. All 3B34 series modules are mix-and-match and Hot Swappable. APPLICATIONS Industrial signal conditioning Industrial signal isolation Industrial signal filtering ...

Page 2

... RTDs and a 1mA excitation current for copper RTDs is provided to create an input voltage to the 3B34. For three-wire RTDs, the excitation current flows through the third RTD lead to eliminate the effect of lead resistance with an accuracy of +0.02oC/W. Internal multi-pole ...

Page 3

... Models Available Model 3B34-00 100 Ω Pt, (alpha) = 0.00385 3B34-01 100 Ω Pt, (alpha) = 0.00385 100 Ω Pt, (alpha) = 0.00385 3B34-02 3B34-03 100 Ω Pt, (alpha) = 0.00385 3B34-04 100 Ω Pt, (alpha) = 0.00385 100 Ω Pt, (alpha) = 0.00385 3B34-Custom Model RTD Sensor (2 or 3-wire) 3B34-C-00 10 Ω Copper, (alpha) = 0.004274 10 Ω ...

Page 4

... Sensor Excitation Current 0.25 mA 1.0 mA Lead Resistance Effect ±0.02°C/Ω ±0.2°C/Ω Input Protection (Includes Excitation Currents) 220 V rms maximum ANSI/IEEE C37.90.1-1989 Continuous Short to Ground 130 V rms, continuous 6 Power Supply Voltages ±(11 16.5 V dc) ±10 mA ±0.01% span/V Rev Page 3B34 ...

Page 5

... Environmental -25°C to +85°C -55°C to +85° 95% @ +60°C noncondensing ±0.5% Span error @ 400 MHz, 5 Watt Ω Ω current output load of 400 or less is applied, + sufficient for loop power. If only Rev Page 3B34 ...

Page 6

... PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS Figure 3 3B34 Input Field Connections Table 1. Pin Function Descriptions— Pin No. Description 1 +EXC -EXC ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

Page 7

... OUTLINE DIMENSIONS Figure 5. Outline Dimensions Rev Page 3B34 ...

Page 8

... NOTES © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. D05115-0-9/04(0) Rev Page 3B34 ...

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