DI–720/DI–722/DI–730 Series User Manual
Accessories
69
DI-8B47 Linearized Thermocouple Input Modules
Each DI-8B47 module isolates, filters, amplifies, and linearizes a single channel of temperature input from a thermo-
couple and provides an analog voltage output.
Linearization is accomplished using a four breakpoint piece wise 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 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 DI-8B47 module provides protection against accidental connection of power-line volt-
ages up to 240VAC.
Note
: The temperature accuracy of these thermocouple modules when used with the DI-78B is ±2ºC @25ºC.
Ordering Information
MODEL
TYPE
INPUT RANGE
ACCURACY*
DI-8B47J-01
Type J
0°C to +760°C (+32°F to +1400°F)
±0.24% ±1.82°C
DI-8B47J-02
Type J
-100°C to +300°C (-148°F to +572°F)
±0.24% ±0.96°C
DI-8B47J-03
Type J
0°C to +500°C (+32°F to +932°F)
±0.21% ±1.05°C
DI-8B47J-12
Type J
-100°C to +760°C (-148°F to +1400°F)
±0.24% ±2.10°C
DI-8B47K-04
Type K
0°C to +1000°C (+32°F to +1832°F)
±0.24% ±2.40°C
DI-8B47K-05
Type K
0°C to +500°C (+32°F to +932°F)
±0.24% ±1.05°C
DI-8B47K-13
Type K
-100°C to +1350°C (-148°F to +2462°F)
±0.24% ±3.60°C
DI-8B47K-14
Type K
0°C to +1200°C (+32°F to +2192°F)
±0.24% ±2.88°C
DI-8B47T-06
Type T
-100°C to +400°C (+32°F to +392°F)
±0.48% ±2.40°C
DI-8B47T-07
Type T
0°C to +200°C (+32°F to +392°F)
±0.39% ±0.75°C
*Includes conformity, hysteresis and repeatability. Does not include CJC accuracy.
Содержание DI-725/E
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