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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 screw-

terminals.

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 surface-

mount 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

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 +0.25

C @

+25

C ambient temperature. The module generates a

predictable upscale signal to indicate an open thermocouple; for

a downscale response, connect a 20MΩ, 0.25W resistor across

screw terminals 1 and 3.

The 5B47 protects the computer side from damage due to field-

side over-voltage faults. All models withstand 240V rms at their

input terminals without damage, thereby shielding computer-

side 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.

Figure 2

Rev. 0 | Page 2 of 8

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

Input Type

Type J

Type K

Type T

Type E

Type R

Type S

Type B

Type J, K, T, E, R, S, B

Input Range

0°C to +760°C (+32°F to +1400°F)

-100°C to +300°C (-148°F to +572°F)

0°C to +500°C (+32°F to +932°F)

0°C to +1000°C (+32°F to +1832°F)

0°C to +500°C (+32°F to +932°F)

-100°C to +400°C (-148°F to +752°F)

0°C to +200°C (+32°F to +392°F)

0°C to +1000°C (+32°F to +1832°F)

+500°C to +1750°C (+932°F to +3182°F)

+500°C to +1800°C (+932°F to +3272°F)

Output Range

0 V to +5 V

Accuracy

±1.1°C

±0.5°C

±0.6°C

±1.3°C

±0.6°C

±1.4°C

±0.5°C

±1.7°C

±2.5°C

±2.4°C

±5.1°C

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 (R

> 50 k

Ω)

Accuracy

Initial @ +25°C

Input Offset vs. Temperature

Output Offset vs. Temperature

Gain vs. Temperature

See Model Table

±1 µV/°C

±20 µV/°C

±0.0025% of Reading/°C

Cold Junction Compensation

Initial Accuracy @ +25°C

Accuracy, +5°C to +45°C

Input Bias Current

Input Resistance

Power On

Power Off

Overload

Noise

Input, 0.1 Hz to 10 Hz Bandwidth

0.2 µV rms

Ω

40 k

Ω

40 k

Ω

±0.25°C (±0.75°C, maximum)

±0.5°C (±0.0125°C/°C)

-25 nA

Refer to Model Table

±5 mV to ±500 mV

+1 V to +5 V or 0 V to +5 V

Model 5B47

Rev. 0 | Page 3 of 8

5B47

Output, 100 kHz Bandwidth

Bandwidth, -3 dB

Output Rise Time, 10% to 90% Span

500 µV rms

4 Hz

200 ms

Common-Mode Voltage (CMV)

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

Ω

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

Ω

Continuous Short to Ground

6 µs @ C

load

= 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 µV/% of V

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

-25°C to +85°C

-40°C to +85°C

0 to 93% @ +40°C non-condensing

±0.5% Span error @ 400 MHz, 5 Watt, 3 ft

Includes the combined effects of repeatability, hysteresis, and nonlinearity and assumes R

> 50 k

Ω

. Loads heavier than 50 k

Ω

will degrade nonlinearity and gain temperature

coefficient.

±1 µV/°C is equivalent to 0.02°C/°C for Type J thermocouples; 0.025°C/°C for Type K and T thermocouples; 0.016°C/°C for Type E thermocouples; 0.168°C/°C for Type R and S

thermocouples.

When used with the model AC1361 CJC sensor (see Accessories section), which is provided on each channel of 5B Series backplanes and mounting cards.

The output common must be kept within ±3 V of power common.

Specifications subject to change without notice.

Rev. 0 | Page 4 of 8

5B47

PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS

Figure 3 5B47 Input Field Connections

Table 1. Pin Function Descriptions—

Pin No.

Description

-EXC

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.

Rev. 0 | Page 5 of 8