DI-8B47 Linearized Thermocouple Input Modules
FEATURES
• Interfaces to Types J, K and T
• Linearizes Thermocouple Signal
• High Level Voltage Outputs
• 1500Vrms Transformer Isolation
• ANSI/IEEE C37.90.1
• Input Protected to 240VAC Continu-
ous
• 120dB CMR
• 70dB NMR at 60Hz
• Low Drift with Ambient Temperature
• Accurate CJC -40°C to +85°C
• CSA, FM, and CE Certifications
Pending
• Mix and Match Module Types
SPECIFICATIONS
Input Range
Input Bias Current
Input Resistance
Typical at T
A
= +25ºC and +5V Power
DI-8B47
-0.1V to +0.5V
-25nA
Normal
Power Off
Overload
Continuous
Transient
50MΩ
450kΩ
450kΩ
240VAC
ANSI/IEEE C37.90.1
0.25mA
±0.02˚C/Ω¹
1500Vrms max
ANSI/IEEE C37.90.1
120dB
70dB at 60Hz
See Ordering Information on Page 2
±20ppm/ºC
±75ppm/ºC
250µVrms
3Hz
150ms
0 to +5V
Continuous Short to Ground
ANSI/IEEE C37.90.1
±0.5ºC
±1.5ºC
+5VDC ±5%
30mA
±25ppm/%
1.11" × 1.65" × 0.40"
(28.1mm × 41.9mm × 10.2mm)
-40ºC to +85ºC
-40ºC to +85ºC
0 to 95% Noncondensing
Input Protection
Sensor Excitation Current
Lead Resistance Effect
CMV, Input to Output
Transient, Input to Output
CMR (50Hz or 60Hz)
NMR
Accuracy
Stability
Noise
DESCRIPTION
DI-8B modules are an optimal solution
for monitoring real-world process signals
and providing high level signals to a data
acquisition system. Each DI-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 DI-8B47 can interface to industry
standard thermocouple type J, K, and T and
has an output signal of 0V to +5V. Each
module is cold-junction compensated to
correct for parasitic thermocouples formed
by the thermocouple wire and screw termi-
nals 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 DI-8B47
module provides protection against ac-
cidental connection of power-line voltages
up to 240VAC.
The modules are designed for installation
in Class I, Division 2 hazardous locations
and have a high level of immunity to envi-
ronmental noise.
Offset
Gain
Output, 100kHz
Bandwidth, -3dB
Response Time, 90% Span
Output Range
Output Protection
Transient
Cold Junction Compensation
Accuracy, 25ºC
Accuracy, -40ºC to +85ºC
Power Supply Voltage
Power Supply Current
Power Supply Sensitivity
Mechanical Dimensions
Environmental
Operating Temperature
Storage Temperature
Relative Humidity
DATAQ Instruments, Inc. • 241 Springside Drive • Akron, Ohio 44333 • Tel: 330-668-1444 • Email: support@dataq.com • www.dataq.com
DI-8B47 Linearized Thermocouple Input Module
Block Diagram
Ordering Information
Model Number
TC Type
Input Range
DI-8B47J-01
J
0°C to +760°C (+32°F to +1400°F)
DI-8B47J-02
J
-100°C to +300°C (-148°F to +572°F)
DI-8B47J-03
J
0°C to +500°C (+32°F to +932°F)
DI-8B47J-12
J
-100°C to +760°C (-148°F to +1400°F)
DI-8B47K-04
K
0°C to +1000°C (+32°F to +1832°F)
DI-8B47K-05
K
0°C to +500°C (+32°F to +932°F)
DI-8B47K-13
K
-100°C to +1350°C (-148°F to +2462°F)
DI-8B47K-14
K
0°C to +1200°C (+32°F to +2192°F)
T
-100°C to +400°C (+32°F to +392°F)
DI-8B47T-06
T
0°C to +200°C (+32°F to +392°F)
DI-8B47T-07
* Includes conformity, hysteresis, and repeatability. Does not include CJC Accuracy.
Accuracy*
±0.24% ±1.82°C
±0.24% ±0.96°C
±0.21% ±1.05°C
±0.24% ±2.10°C
±0.24% ±2.40°C
±0.24% ±1.05°C
±0.24% ±3.60°C
±0.24% ±2.88°C
±0.48% ±2.40°C
±0.39% ±0.75°C
DATAQ
INSTRUMENTS
R
241 Springside Drive
Akron, Ohio 44333
330-668-1444
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The information on this data sheet is subject to change without notice.
DATAQ and the DATAQ logo are registered trademarks of DATAQ Instruments, Inc. All rights reserved. Copyright © 2005 DATAQ Instruments, Inc.
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