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Isolated Process Current Output 3B39
FEATURES
Interfaces, isolates, & filters a 0 to +10V or -10V to +10V input signal and provides an isolated process current output across loads of 0 to 850.. Intended for high-accuracy process control and monitoring applications requiring total galvanic isolation. Module circuitry can withstand 220v rms at the output screw-terminals. All 3B39 series modules are mix-and-match and Hot Swappable
FUNCTIONAL BLOCK DIAGRAM
Figure 1. 3B39 Functional Block Diagram
APPLICATIONS
Industrial signal conditioning Industrial signal isolation Industrial signal filtering
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/oC (low-level input 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.
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 singleended 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).
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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.
3B39 GENERAL DESCRIPTION
The 3B39 is a single-channel signal conditioning current output module that interfaces, isolates and filters a 0 to +10V or -10V to +10V input signal and provides an isolated process current output across loads of 0 to 850. The output current appears at the 3B Series backplane current output screw terminal block. It is intended for high-accuracy process control and monitoring applications requiring complete galvanic isolation and protection against damage from transients and faults between systems or separated system elements. Either of the two input voltage ranges can be converted to either of the two output current ranges via programming jumpers provided on the bottom of the module. Model 3B39 features a nonlinearity of +0.01% and an accuracy of +0.1%. Providing +1500V peak of galvanic transformer based isolation output-to-input and power, the 3B39 offers a common mode rejection (CMR) of 90 dB @ 50/60 Hz to preserve the integrity of low level signals in noisy environments. The 3B39 is mix-and-match and hot-swappable with other 3B Series modules, so it can be inserted or removed from any socket in the same backplane without disturbing system power. Signal isolation by transformer coupling uses a proprietary modulation technique for linear, stable and reliable performance. A demodulator on the output side of the signal transformer recovers the original signal, which is then filtered and converted to an accurate current output by a current (V-toI) converter output stage. Output protection enables the 3B39 to withstand accidental connection to 220V rms power lines without damage, isolating computer-side circuitry. The 3B39 provides total ground isolation and transient protection when interfacing DACs to standard 4-20 mA current loops, common requirement in microcomputer based control system.
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Figure 2
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3B39
3B39 Specifications
(typical @ +25C and 15 V dc, and +24 V dc Power) Description Input Voltage Standard Ranges Input, Without Damage Input Resistance 10 k Output Ranges Standard Ranges (RL = 0 to 850) Custom Ranges 4 mA to 20 mA or 0 mA to 20 mA Not Available Accuracy2 Initial @ +25C Nonlinearity 0.1% Span + CJC Sensor Error 0.01% Span Stability vs. Temperature Current Output Zero Span Zero and Span Adjustment Range 25 ppm of Span/C 25 ppm of Reading/C 5% of Span Noise Input, 0.1 Hz to 10 Hz Bandwidth Output, 100 kHz Bandwidth Bandwidth, -3 dB Output Rise Time, 10% to 90% Span 0.2 V rms 50 V rms 3 Hz 2 ms Common-Mode Voltage (CMV) Input-to-Output, Continuous Transient 1500 V peak, maximum ANSI/IEEE C37.90.1-1989 Common Mode Rejection (CMR) 1 k Source Imbalance, 50/60 Hz 90 dB Output Protection Continuous, Normal Mode Transient 220 V rms, maximum ANSI/IEEE C37.90.1-1989 Power Supply Voltages 3 15 V dc Supplies Rated Operation Current Sensitivity +24 V dc Loop Supply Rated Operation Current +12 V dc to +30 V dc +27 mA @ lout = 20 mA Rev. 0 | Page 3 of 8 (11.5 V dc to 16.5 V dc) 10 mA 0.01% span/V
1
Model 3B39 0 V to +10 V or -10 V to +10 V -20 V to +20 V, maximum
3B39
Sensitivity Mechanical Dimensions 0.0002% span/V 3.15" x 3.395" x 0.775" (80.0 mm x 86.2 mm x 19.7 mm) Environmental Temperature Range Rated Performance Storage Relative Humidity, 24 hours RFI Susceptibility
1 2
-25C to +85C -55C to +85C 0 to 95% @ +60C noncondensing 0.5% Span error @ 400 MHz, 5 Watt, 3 ft
Input and Output Range may be selected using jumpers supplied. Includes the combined effects of repeatability, hysteresis, and nonlinearity. 3 +24 V dc loop power is required for driving the current output at loads up to 850. If a current output load of 400 or less is applied, +15 V dc is sufficient for loop power. If only voltage output is used, loop power is not required. Specifications subject to change without notice.
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3B39 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 3B39 Input Field Connections
Table 1. Pin Function Descriptions--
Pin No. 1 2 3 4 Description OUT RETURN
Figure 4 . Model 3B 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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3B39 OUTLINE DIMENSIONS
Figure 5. Outline Dimensions
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3B39 NOTES
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3B39 NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. D05117-0-9/04(0)
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