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Isolated, Linearized Thermocouple Input 5B47
FEATURES
Isolated Thermocouple Input. Amplifies, Protects, Filters, and Isolates Thermocouple Input Works with J, K, T, E, R, S, and B-type thermocouple. Generates aisolated and protected precision output of 0 to +5V. Module circuitry can withstand 240v rms at the input screwterminals. All 5B47 series modules are mix-and-match and Hot Swappable.
Figure 1. 5B47 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.
FUNCTIONAL BLOCK DIAGRAM
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.
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.
5B47 GENERAL DESCRIPTION
The 5B47 is a single-channel signal conditioning module that interfaces, amplifies and filters J, K, T, E, R, S, and B-type thermocouple. The module provides an isolated and protected precision output of 0 to + 5 V. The 5B47 internally linearizes its input signal to provide an output that is linear with temperature. Accuracy for each type of sensor is specified in the 5B47 model table. (See Model 5B37 for non-linearized conditioning of thermocouple signals.) Accurate and System-Ready - Internal cold-junction compensation largely corrects errors arising from parasitic thermocouples formed by thermocouple connection to the input screw terminals, providing an accuracy of +0.25oC @ +25oC ambient temperature. The module generates a predictable upscale signal to indicate an open thermocouple; for a downscale response, connect a 20M, 0.25W resistor across screw terminals 1 and 3. The 5B47 protects the computer side from damage due to fieldside over-voltage faults. All models withstand 240V rms at their input terminals without damage, thereby shielding computerside circuitry from field-side over-voltage conditions. Further, the 5B47 is mix-and-match and hot-swappable with other 5B Series modules, so can be inserted or removed from any socket in the same backplane without disrupting system power. Inside the 5B47 Module - A chopper-stabilized input amplifier provides low drift and stable gain. At the amplifier input, a . stable, laser-trimmed zero-scale input voltage is subtracted from the input signal to set the zero-scale value. 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 low-pass filtering with a 4-Hz cutoff (-3 dB) provides 60 dB of normal-mode rejection (noise on signal) and enhancement of common-mode rejection (noise on signal return) at 60 Hz, enabling accurate measurement of small signals in high electrical noise. Signal isolation by transformer coupling uses a proprietary modulation technique for linear, stable and reliable performance. The differential input circuit on the field side is fully floating, eliminating the need for any input grounding. A demodulator on the computer side of the signal transformer recovers the original signal, which is then filtered and buffered to provide a low-noise, low-impedance output signal. The output common must be kept within +3 V of power common. 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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5B47
5B47 Models Available
Model 5B47-J-01 5B47-J-02 5B47-J-03 5B47-K-04 5B47-K-05 5B47-T-06 5B47-T-07 5B47-E-08 5B47-R-09 5B47-S-10 5B47-B-11 5B47-Custom
1
Input Type Type J Type J Type J Type K Type K Type T Type T Type E Type R Type S Type B Type J, K, T, E, R, S, B
Input Range 0C to +760C (+32F to +1400F) -100C to +300C (-148F to +572F) 0C to +500C (+32F to +932F) 0C to +1000C (+32F to +1832F) 0C to +500C (+32F to +932F) -100C to +400C (-148F to +752F) 0C to +200C (+32F to +392F) 0C to +1000C (+32F to +1832F) +500C to +1750C (+932F to +3182F) +500C to +1750C (+932F to +3182F) +500C to +1800C (+932F to +3272F) *
Output Range 0 V to +5 V 0 V to +5 V 0 V to +5 V 0 V to +5 V 0 V to +5 V 0 V to +5 V 0 V to +5 V 0 V to +5 V 0 V to +5 V 0 V to +5 V 0 V to +5 V *
Accuracy1 1.1C 0.5C 0.6C 1.3C 0.6C 1.4C 0.5C 1.7C 2.5C 2.4C 5.1C
The CJC sensor accuracy should be added to the module accuracy for a system accuracy. * Custom Input/Output ranges are available. Refer to configuration guide.
5B47 Specifications
Description Input Ranges Standard Ranges Custom Ranges Output Ranges (RL > 50 k ) Accuracy1 Initial @ +25C Input Offset vs. Temperature
2
Model 5B47
Refer to Model Table 5 mV to 500 mV +1 V to +5 V or 0 V to +5 V
See Model Table 1 V/C 20 V/C 0.0025% of Reading/C Cold Junction Compensation
Output Offset vs. Temperature Gain vs. Temperature
Initial Accuracy @ +25C3 Accuracy, +5C to +45C Input Bias Current Input Resistance Power On Power Off Overload Noise Input, 0.1 Hz to 10 Hz Bandwidth
0.25C (0.75C, maximum) 0.5C (0.0125C/C) -25 nA
5M 40 k 40 k
0.2 V rms
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5B47
Output, 100 kHz Bandwidth Bandwidth, -3 dB Output Rise Time, 10% to 90% Span 500 V rms 4 Hz 200 ms
Common-Mode Voltage (CMV)
Input-to-Output, Continuous Output-to-Power, Continuous4 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 (NMR), 50/60 Hz 160 dB 60 dB
Input Protection
Continuous Transient Output Resistance 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" Min Logic "1" Max Logic "1" Input Current "0" Open Input Response Open Input Response Time Power Supply Voltage Power Supply Current Power Supply Sensitivity, RTI Mechanical Dimensions +1 V +2.5 V +36 V 0.4 mA Upscale 10 seconds +5 V 5% 30 mA 2 V/% of 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 non-condensing 0.5% Span error @ 400 MHz, 5 Watt, 3 ft
Includes the combined effects of repeatability, hysteresis, and nonlinearity and assumes RL > 50 k . Loads heavier than 50 k will degrade nonlinearity and gain temperature coefficient. 2 1 V/C is equivalent to 0.02C/C for Type J thermocouples; 0.025C/C for Type K and T thermocouples; 0.016C/C for Type E thermocouples; 0.168C/C for Type R and S thermocouples. 3 When used with the model AC1361 CJC sensor (see Accessories section), which is provided on each channel of 5B Series backplanes and mounting cards. 4 The output common must be kept within 3 V of power common. Specifications subject to change without notice.
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5B47 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 5B47 Input Field Connections
Table 1. Pin Function Descriptions--
Pin No. 1 2 3 4 Description -EXC LO HI N/C
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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5B47 OUTLINE DIMENSIONS
Figure 5. Outline Dimensions
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5B47 NOTES
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5B47 NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. D05102-0-9/04(0)
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