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Single-Channel Signal Conditioning Module 5B32
FEATURES
Isolated Current Input. Amplifies, Protects, Filters, and Isolates Analog Input. Measure process-current input signal of 4-20 mA or 0-20 mA by reading the voltage across an external precision 20 resistor (supplied). Generates an output of 0 to +5V. Extra Current Conversion resistors are available. Module circuitry can withstand 240v rms at the input screwterminals. All 5B32 series modules are mix-and-match and Hot Swappable.
FUNCTIONAL BLOCK DIAGRAM
Figure 1. 5B32 Functional Block Diagram
APPLICATIONS
Industrial signal conditioning Industrial signal isolation Industrial signal filtering
There are also a number of backplanes and mounting sockets which provide a complete signal conditioning solution for end users. Each backplane incorporates screw terminals for field wiring inputs and outputs and cold junction sensors for thermocouple applications. These signal conditioners are designed to provide an easy and convenient solution to signal conditioning problems of both designers and end users in measurement and control applications. Typical uses include microcomputer-based measurement systems, standard data acquisition systems, programmable controllers, analog recorders and dedicated control systems. The 5 B series modules are ideally suited to applications where monitoring and control of temperature, pressure, flow, rotation and other analog signals are required. The 5B Series modules and backplanes are approved by Factory Mutual (FM) and the 5B Series modules are approved by the Canadian Standards Association (CSA) for use in Class 1, Division 2, Groups A, B, C, and D locations. These approvals certify that the 5B Series is suitable for use in locations where a hazardous concentration of flammable gas may exist only under fault conditions of operation. Equipment of this category is called "nonincendive" and they need no special enclosures or other physical safeguards. The 5B series modules and backplanes have been tested and passed the stringent heavy industrial requirements of the European Union's electromagnetic compatibility (ENC) directive - EN50082-1 and EN50081-2. When used according to installation directions (refer to 5B series User Manual), any errors caused by EMI/RFI interference will be less than 0.1% of the full scale 5B measurement range for field strengths up to 10 V/M and frequencies up to 1 GHz.
PRODUCT OVERVIEW
The 5B Series represents an innovative generation of low cost, high performance plug-in signal conditioners. Designed for industrial applications, these modules incorporate highly reliable transformer-based isolation and automated surfacemount manufacturing technology. They are compact, economical components whose performance exceeds that available from more expensive devices. Combining 1500 V rms continuous isolation, +0.05% calibrated accuracy, small size and low cost, the 5B Series is an attractive alternative to expensive signal conditioners and in-house designs All modules are potted and identical in pin-out and size (2.27" x 2.32" x 0.595"). They can be mixed and matched, permitting users to address their exact needs, and may be "hot swapped without disturbing field wiring or power. The isolated input modules provide 0 to +5V or +5V outputs and accept J, K, T, E, R, S, N, or B type thermocouples. These modules feature complete signal conditioning functions including 240 V rms input protection, filtering, chopper stabilized low drift +1 uV/oC amplification, 1500 V rms isolation, and sensor excitation when required. All modules feature excellent common mode rejection and meet industrial transient surge withstand specifications.
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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.
5B32 GENERAL DESCRIPTION
The 5B32 is a single-channel signal conditioning module that amplifies, protects, filters and isolates its analog input. The module measures a process current input signal of 4-20 mA or 0-20 mA by reading the voltage across an external precision 20W resistor (supplied) and generating an output of 0 to +5 V. Extra current conversion resistor are available as accessories (See Model AC1362 in the Accessories section). Note that the 5B32 module circuitry can withstand 240 V rms at the input screw-terminals, thereby shielding computer-side circuitry from field-side overvoltage conditions. In addition, all 5B32 Series modules are mix-and-match and hot swappable, so can be inserted or removed from any socket in the same backplane without powering down the system. A chopper-stabilized input amplifier provides low drift and stable gain. At the amplifier input, a stable, laser-trimmed zeroscale input offset is subtracted from the input signal to set the . zero-scale value for the 4-20 mA range. For user convenience, the zero can be optionally factory-set to meet custom needs, This allows suppression of a zero-scale input value many times larger than the total span for precise expanded-scale measurements. Internal multi-pole lowpass filtering with a four-Hz cutoff (3dB) enhances normal-mode (noise on signal) and commonmode (noise on signal return) rejection at 50/60 Hz, enabling accurate measurement of small signals in high electrical noise. A series output switch eliminates the need for external multiplexing in many applications. The switch is turned on by an active-low enable input. If the switch is to be on at all times, the enable-input should be grounded to power common as it is on the 5B01 and 5B08 backplanes..
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Figure 2
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5B32 5B32--SPECIFICATIONS
5B32 Specifications Description Model 5B32 Input Ranges
Standard Ranges Custom Ranges Output Ranges (RL > 50 k)
4
0 mA to 20 mA or 4 mA to 20 mA 0 mA to 20 mA (refer to ordering section) -5 V to +5 V or 0 V to +5 V
Accuracy2
Initial @ +25C Nonlinearity Input Offset vs. Temperature Output Offset vs. Temperature Gain vs. Temperature 0.05% Span 0.05% Iz1 0.02% Span 0.0025 of Iz/C 20 V/C 0.0025% of Reading/C
Input Resistor5
Value Accuracy Stability vs. Temperature 20.0 0.1% 0.001%/C
Noise
Input, 0.1 Hz to 10 Hz Bandwidth Output, 100 kHz Bandwidth Bandwidth, -3 dB Output Rise Time, 10% to 90% Span 10 nA rms 200 V rms 4 Hz 200 ms
Common-Mode Voltage (CMV)3
Input-to-Output, Continuous Output-to-Power, Continuous Transient 1500 V rms maximum 3 V maximum ANSI/IEEE C37.90.1-1989
Common Mode Rejection (CMR)
1 k Source Imbalance, 50/60 Hz Normal Mode Rejection 50/60 Hz 160 dB 60 dB
Input Protection
Continuous Transient Output Resistance4 Voltage Output Protection Output Selection Time 240 V rms maximum ANSI/IEEE C37.90.1-1989 50 Continuous Short to Ground 6 s @ Cload = 0 to 2,000 pF
Output Enable Control
Max Logic "0" +1 V
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5B32
Min Logic "1" Max Logic "1" Input Current "0" Power Supply Voltage Power Supply Current Power Supply Sensitivity, RTI Mechanical Dimensions +2.5 V +36 V 0.4 mA +5 V 5% 30 mA 2 V/Vs% 2.275" x 2.375" x 0.595" (57.8 mm x 59.1 mm x 15.1 mm)
Environmental
Temperature Range Rated Performance Operating Storage Relative Humidity RFI Susceptibility -25C to +85C -40C to +85C -40C to +85C 0 to 93% @ +40C noncondensing 0.5% Span error @ 400 MHz, 5 Watt, 3 ft
1 Iz is the nominal input current that results in a 0 V output. 2 Includes the combined effects of repeatability, hysteresis, and nonlinearity and assumes RL > 50 k. Does not include current-to-voltage input resistor (AC1362) error. 3 The output common must be kept within 3 V of power common. 4 Loads heavier than 50 k will degrade nonlinearity and gain temperature coefficient. 5 The current-to-voltage conversion resistor (AC1362) is supplied as a plug-in component for mounting external to the module. All backplanes and mounting cards provide pin sockets for mounting the AC1362 resistor. Specifications subject to change without notice.
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5B32 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 5B32 Input Field Connections
Table 1. Pin Function Descriptions--
Pin No. 1 2 3 4 5 6 16 17 18 19 20 21 22 23 Description SENSOR SENSOR + EXCITATION EXCITATION + INPUT LO INPUT HI POWER COM +5V DC VIN (5B39 ONLY) I/O COM VOUT (EXCEPT 5B39) RESERVED READ ENABLE (0) WRITE ENABLE (0)
Figure 4 . Model 5B 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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5B32 OUTLINE DIMENSIONS
Figure 5. Outline Dimensions
5B32 Models Available Model
5B32-01 5B32-02 5B32-Custom
* Custom Input/Output ranges are available. Refer to configuration guide.
Input Range
4 mA to 20 mA 0 mA to 20 mA *
Output Range
0 V to +5 V 0 V to +5 V *
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5B32 NOTES
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5B32 NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. D05096-0-9/04(0)
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