Impulse 8B47 User Manual

SensorLex 8B Isolated Analog Signal Conditioning Products

8B47

Linearized Thermocouple Input Modules

Description

8B modules are an optimal solution for monitoring real-world process signals

and providing high level signals to a data acquisition system. Each 8B47

module isolates, filters, amplifies, and linearizes a single channel of temperature

input from a thermocouple and provides an analog voltage output.

Linearization is accomplished using a four breakpoint piecewise linear

approximation.

The 8B47 can interface to industry standard thermocouple types:

J, K, and T and has an output signal of 0 to +5V. Each module is cold-junction

compensated to correct for parasitic thermocouples formed by the

thermocouple wire and screw terminals on the mounting backpanel. Upscale

open thermocouple detect is provided by an internal pull-up resistor.

Signal filtering is accomplished with a three-pole filter optimized for time and

frequency response which provides 70dB of normal-mode-rejection at 60Hz.

One pole of this filter is on the field side of the isolation barrier for anti-aliasing,

and the other two are on the system side.

A special input circuit on the 8B47 modules provides protection against

accidental connection of power-line voltages up to 240VAC. Clamp circuits on

the I/O and power terminals protect against harmful transients.

The modules are designed for installation in Class I, Division 2 hazardous

locations and have a high level of immunity to environmental noise.

▲

Features

 Interfaces to Types J, K, and T Thermocouples

 Linearizes Thermocouple Signal

 High Level Voltage Outputs

 1500Vrms Isolation

 ANSI/IEEE C37.90.1 Transient Protection

 Input Protected to 240VAC Continuous

 120dB CMR

 70dB NMR at 60Hz

 Low Drift with Ambient Temperature

 Accurate CJC -40°C to +85°C

 UL Listing Pending

 Mix and Match Module Types on Backpanel

Figure 1: 8B47 Block Diagram

For information call 800-444-7644

SensorLex 8B Isolated Analog Signal Conditioning Products

Specifications

Module

Input Range 0.1V to +0.5V

Input Bias Current 25nA

Input Resistance

Normal 50MΩ Power Off 200kΩ Overload 200kΩ

Input Protection

Continuous

Transient

CMV, Input to Output 1500Vrms max

Transient, Input to Output

CMR (50Hz or 60Hz) 120dB

NMR 70dB at 60Hz

Accuracy See Ordering Information

Stability

Offset ±20ppm/°C

Gain ±75ppm/°C

Noise

Output, 100kHz 250µVrms

Bandwidth, 3dB 3Hz

Response Time, 90% Span 150ms

Output Range 0V to +5V

Output Protection Continuous Short to Ground

Transient ANSI/IEEE C37.90.1

Cold Junction Compensation

Accuracy, 25°C ±0.5°C

Accuracy, -40°C to +85°C ±1.5°C

Power Supply Voltage +5VDC ±5%

Power Supply Current 30mA

Power Supply Sensitivity ±100ppm/%

Mechanical Dimensions 1.11" x 1.65" x 0.40"

(h)(w)(d) (28.1mm x 41.9mm x 10.2mm)

Environmental

Operating Temp. Range -40°C to +85°C

Storage Temp. Range -40°C to +85°C

Relative Humidity 0 to 95% Noncondensing

Emissions EN61000-6-4 ISM, Group 1

Radiated, Conducted Class A

Immunity EN61000-6-2 ISM, Group 1

R F Performance A ±0.5% Span Error

ESD, EFT, Surge, Voltage Dips Performance B

NOTES:

(1) 240VAC between + and  / +EXC / EXC terminals. 120VAC between  and +EXC / EXC terminals

and between +EXC and EXC terminals.

(2) Includes conformity, hysteresis and repeatability. Does not include CJC accuracy.

(1)

Typical at TA=+25°C and +5V power

8B47

240VAC

ANSI/IEEE C37.90.1

Ordering Information



Model

Input Range

8B47J-01 J 0°C to +760°C 0V to +5V ±0.24% ±1.82°C

(+32°F to +1400°F)

8B47J-02 J 100°C to +300°C 0V to +5V ±0.24% ±0.96°C

(148°F to +572°F)

8B47J-03 J 0°C to +500°C 0V to +5V ±0.21% ±1.05°C

(+32°F to 932°F)

8B47J-12 J 100°C to +760°C 0V to +5V ±0.24% ±2.10°C

(148°F to +1400°F)

8B47K-04 K 0°C to +1000°C 0V to +5V ±0.24% ±2.40°C

(+32°F to +1832°F)

8B47K-05 K 0°C to +500°C 0V to +5V ±0.24% ±1.05°C

(+32°F to +932°F)

8B47K-13 K 100°C to +1350°C 0V to +5V ±0.24% ±3.60°C

(148°F to +2462°F)

8B47K-14 K 0°C to +1200°C 0V to +5V ±0.24% ±2.88°C

(+32°F to +2192°F)

8B47T-06 T 100°C to +400°C 0V to +5V ±0.48% ±2.40°C

(148°F to +752°F)

8B47T-07 T 0°C to +200°C 0V to +5V ±0.39% ±0.75°C

(+32°F to +392°F)



Thermocouple Alloy Combinations

Standards: DIN IEC 584, ANSI MC96-1-82, JIS C 1602-1981

Type Material

J Iron vs. Copper-Nickel K Nickel-Chromium vs. Nickel-Aluminum T Copper vs. Copper-Nickel

Output

Range Type

Accuracy

(2)

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