DI-8B47 Linearized Thermocouple Input Modules
FEATURES
SPECIFICATIONS
Typical at T = +25ºC and +5V Power
A
• Interfaces to Types J, K and T
DI-8B47
-0.1V to +0.5V
-25nA
• Linearizes Thermocouple Signal
• High Level Voltage Outputs
• 1500Vrms Transformer Isolation
• ANSI/IEEE C37.90.1
Input Range
Input Bias Current
Input Resistance
Normal
Power Off
Overload
50MΩ
450kΩ
450kΩ
• Input Protected to 240VAC Continu-
ous
Input Protection
• 120dB CMR
Continuous
Transient
240VAC
ANSI/IEEE C37.90.1
• 70dB NMR at 60Hz
Sensor Excitation Current
Lead Resistance Effect
CMV, Input to Output
Transient, Input to Output
CMR (50Hz or 60Hz)
NMR
0.25mA
• Low Drift with Ambient Temperature
• Accurate CJC -40°C to +85°C
±0.02˚C/Ω¹
1500Vrms max
• CSA, FM, and CE Certifications
Pending
ANSI/IEEE C37.90.1
120dB
• Mix and Match Module Types
70dB at 60Hz
Accuracy
See Ordering Information on Page 2
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.
Stability
Offset
Gain
±20ppm/ºC
±75ppm/ºC
Noise
Output, 100kHz
250µVrms
3Hz
Bandwidth, -3dB
Response Time, 90% Span
Output Range
150ms
0 to +5V
Linearization is accomplished using a four
breakpoint piecewise linear approximation.
Output Protection
Continuous Short to Ground
ANSI/IEEE C37.90.1
Transient
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.
Cold Junction Compensation
Accuracy, 25ºC
Accuracy, -40ºC to +85ºC
±0.5ºC
±1.5ºC
Power Supply Voltage
+5VDC ±5%
30mA
Power Supply Current
Power Supply Sensitivity
Mechanical Dimensions
±25ppm/%
1.11" × 1.65" × 0.40"
(28.1mm × 41.9mm × 10.2mm)
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.
Environmental
Operating Temperature
Storage Temperature
Relative Humidity
-40ºC to +85ºC
-40ºC to +85ºC
0 to 95% Noncondensing
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.
DATAQ Instruments, Inc.
• 241 Springside Drive • Akron, Ohio 44333 • Tel: 330-668-1444 • Email: support@dataq.com • www.dataq.com
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