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Non Isolated, Linearized RTD Input 7B14
FEATURES
Amplifies, Protects, Filters, and Isolates input voltages from a wide variety of two and three-wire platinum, copper and nickel Resistor Temperature Detectors (RTDs). Module provides a precision output of either +1 V to +5 V or 0 V to +10 V, linear with temperature. All 7B14 series modules are mix-and-match and Hot Swappable.
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
Industrial signal conditioning Industrial signal isolation Industrial signal filtering
Figure 1. 7B14 Functional Block Diagram
PRODUCT OVERVIEW
The 7B Series of signal conditioners feature small size, low cost and a wide output voltage range for a variety of applications including process control and factory-floor environments. The single-channel 7B modules accept inputs from a range of transducers and are fully rated over the extended -40oC to +85oC industrial temperature range. All 7B Series modules are rated for a nominal power supply input of +24 VDC; and, for maximum flexibility, they will accept supply voltages in the +14 VDC to +35 VDC range. The input modules, with the exception of the 7B21, provide a high-level output voltage that is factory configured for either the +1 V to +5 V or 0 V to +10 V range. The 7B21 is a unity gain, isolated input module with an input/output range of +10V. Output modules are available that provide either isolated process current or isolated bipolar voltage output. Model 7B39 converts either a +1 V to +5 V input to a 4 to 20 mA output or a 0 V to +10 V input to a 0-20 mA output. The input/output ranges of the 7B39 are factory configured. The 7B22 is a unity gain module that provides an isolated +10V output signal. All modules have a universal pinout and may be readily hot-swapped under full power without disrupting field wiring. Each module accepts analog transducer signals and transfers them to a process control or factory data collection system without the inherent noise, non-linearity, drift and extraneous voltages which frequently accompany the signals.
The modules feature a maximum nonlinearity of +0.02% and are factory calibrated to guarantee a maximum accuracy specification of +0.1%. The 7B Series offers up to 1500 V rms continuous common mode voltage isolation and 120 V rms of field wiring input protection. The power supplies necessary to drive each of the individual module's input circuitry are internally isolated, enabling the 7B Series modules to offer true channel-to-channel isolation of the input signals. The modules directly accept analog signals from thermocouples, RTDs, current loop powered transmitters, and other process control signals. The 7B Series modules amplify, linearize, isolate, protect and convert the transducer output signals to standardized analog inputs for high-level analog I/O subsystems. The 7B Series Subsystem consists of 19-inch rackcompatible hardware (model AC 1363), with universal mounting backplane and a family of plug-in (up to 16 per backplane) input and output signal conditioning modules. Four, eight-, and sixteen-channel backplanes are available. Each backplane incorporates screw terminals for easy power connections and field wiring, and includes a 25-pin D-type connector for interfacing the high-level single-ended voltage outputs to the user's equipment. Gold-plated sockets are provided on each channel of the backplane to ensure the reliability of each module's electrical connection.
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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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved.
7B14 GENERAL DESCRIPTION
The 7B14 is a low cost, single-channel signal conditioning module that interfaces, amplifies and filters input voltages from a wide variety of two-and three-wire platinum, copper and nickel Resistor Temperature Detectors (RTDs) and provides a precision output of either +1 V to +5 V or 0 V to +10 V, linear with temperature. Model 7B14 features a nonlinearity of +0.05% maximum (Pt and Cu RTDs). RTD excitation current, threewire lead resistance compensation and a predictable upscale open circuit indication provide a complete signal conditioning solution. Rated to operate with a nominal +24 VDC supply, Model 7B14 is mix-and-match and hot-swappable with other 7B Series input modules, so it can be inserted or removed from any socket in the same backplane without disturbing system power. The three input pins of Model 7B14 are fully protected up to +30 VDC. A 250 uA excitation current for platinum and nickel RTDs and a 1mA excitation current for copper RTDs is provided to create an input voltage to the 7B14. This current also provides the upscale open circuit indication. A one-pole 3 Hz filter preconditions the RTD signal prior to amplification, provided by a low drift input amplifier. The output section contains a two-pole low pass filter (-3 dB @ 3 Hz) and a buffer amplifier. The two-pole output filter and subsequent buffer ensure that a low noise, low impedance (<1) signal is available at the output to drive loads to 2 k minimum. .
Figure 2
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7B14
7B14 Models Available
Model 7B14-01-1 7B14-01-2 7B14-02-1 7B14-02-2 7B14-03-1 7B14-03-2 7B14-04-1 7B14-04-2 7B14-05-1 7B14-05-2 RTD Sensor (2- or 3-wire) 100 Pt, = 0.00385 100 Pt, = 0.00385 100 Pt, = 0.00385 100 Pt, = 0.00385 100 Pt, = 0.00385 100 Pt, = 0.00385 100 Pt, = 0.00385 100 Pt, = 0.00385 100 Pt, = 0.00385 100 Pt, = 0.00385 Input Range -100C to +100C -100C to +100C 0C to +100C 0C to +100C 0C to +200C 0C to +200C 0C to +600C 0C to +600C -50C to +350C -50C to +350C Output Range +1 V to +5 V 0 V to +10 V +1 V to +5 V 0 V to +10 V +1 V to +5 V 0 V to +10 V +1 V to +5 V 0 V to +10 V +1 V to +5 V 0 V to +10 V Nonlinearity (maximum) 0.05% span 0.05% span 0.05% span 0.05% span 0.05% span 0.05% span 0.05% span 0.05% span 0.05% span 0.05% span Accuracy (maximum) 0.15% span 0.15% span 0.2% span 0.2% span 0.15% span 0.15% span 0.1% span 0.1% span 0.1% span 0.1% span
Model 7B14-C-02-1 7B14-C-02-2
RTD Sensor (2- or 3-wire) 10 Cu, = 0.004274 10 Cu, = 0.004274
Input Range 0C to +120C (10 @ +25C) 0C to +120C (10 @ +25C)
Output Range +1 V to +5 V 0 V to +10 V
Nonlinearity (maximum) 0.05% span 0.05% span
Accuracy (maximum) 1.0% span 1.0% span
Model 7B14-N-01-1 7B14-N-01-2 7B14-N-02-1 7B14-N-02-2
RTD Sensor (2- or 3-wire) 120 Ni, = 0.00672 120 Ni, = 0.00672 120 Ni, = 0.00672 120 Ni, = 0.00672
Input Range 0C to +300C 0C to +300C 0C to +200C 0C to +200C
Output Range +1 V to +5 V 0 V to +10 V +1 V to +5 V 0 V to +10 V
Nonlinearity (maximum) 0.12% span 0.12% span 0.14% span 0.14% span
Accuracy (maximum) 0.3% span 0.3% span 0.3% span 0.3% span
7B14 Specifications (typical @ +23C 5C and Vs = +24 V dc)
Description Input Ranges RTD Types 100 Platinum, 2-, 3-wire, =0.00385 120 Nickel, 2-, 3-wire, =0.00672 10 Copper, =0.004274 Refer to Model Table Not Available* +1 V to +5 V or 0 V to +10 V Accuracy1 Initial @ +25C Refer to Model Table Model 7B14
Temperature Ranges Custom Ranges Output Range Options (RL > 2 k)
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7B14
Nonlinearity2 Input Offset vs. Temperature Zero Suppression vs. Temperature Span vs. Temperature Output Offset vs. Temperature Lead Resistance Effect Refer to Model Table 1 V/C 0.002% (Rz/Rspan)3/C 60 ppm/C 0.002% Span/C 0.02C/ Output Noise 5 MHz Bandwidth 10 Hz to 100 Hz Bandwidth 0.1 Hz to 10 Hz Bandwidth Bandwidth, -3 dB Output Rise Time Normal Mode Rejection @ 50/60 Hz Input Protection Input Transient Protection 1 mV peak 0.4 mV rms 0.6 V peak 3 Hz 250 ms 60 dB 30 V dc, continuous ANSI/IEEE C376.90.1-1989 IEEE-STD 472 IEC 255-4, Class II <1 Continuous Short to Ground Power Supply Voltage Range, Operating Current Sensitivity Mechanical Dimensions +14 V dc to +35 V dc +25 mA, maximum 0.0001%/% of Vs 1.663" x 2.11" x 0.563" (42.24 mm x 53.6 mm x 14.3 mm) Environmental Temperature Range Operating Storage Relative Humidity, 24 hours ESD Sensitivity RFI Susceptibility -40C to +85C -40C to +85C 0 to 90% @ +60C noncondensing IEC 801-2, Level 2 0.5% Span error @ 400 MHz, 5 Watt, 3 ft
Output Resistance Voltage Output Protection
Warm-up time required to meet specifications is approximately 10 minutes. * Contact factory for OEM requirements. 1 Includes the combined effects of repeatability, hysteresis, and nonlinearity. 2 Nonlinearity is calculated using best-fit straight line method. 3 Rz is the value of the RTD resistance at the lowest measurement point. Rspan is the change in resistance over the measurement span. Specifications subject to change without notice.
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7B14 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 7B14 Input Field Connections
Table 1. Pin Function Descriptions--
Pin No. 0 1 2 3 4 5 Input Module Function SENSOR INPUT INPUT HIGH INPUT LOW POWER SUPPLY (DC) OUTPUT VOLTAGE OUTPUT & POWER COMMON Output Module Function NOT USED OUTPUT HIGH OUTPUT LOW POWER SUPPLY (DC) INPUT VOLTAGE INPUT AND POWER COMMON
Figure 4 . Model 7B Series Module, with pin-out assignments.
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. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
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7B14 OUTLINE DIMENSIONS
Figure 5. Outline Dimensions
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7B14 NOTES
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7B14 NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. D05168-0-9/04(0)
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