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DI-8B47 Linearized Thermocouple Amplifiers Series

Linearized Thermocouple Input Modules for the DI-4718B Data Logger.

SKU DI-8B47 Series Category Tag

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DI-8B Linearized Thermocouple Amplifiers DI-8B47 for the DI-4718B Data Logger from DATAQ Instruments.

Product 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 Continuous
  • 120dB CMR
  • 70dB NMR at 60Hz
  • Low Drift with Ambient Temperature
  • Accurate CJC -40°C to +85°C
  • Mix and Match Module Types


Each DI-8B47 module isolates, filters, amplifies, and linearizes a single channel of temperature input from a thermocouple and provides an analogue 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 terminals on the mounting back-panel. A special input circuit on the DI-8B47 module provides protection against accidental 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 environmental noise.

DI-8B47 Series Model Variations

Input Range -0.1V to +0.5V  
Input Bias Current -25nA  
Input Resistance Normal: 50MΩ
Power Off: 200kΩ
Overload: 200kΩ
Input Protection Continuous: 240VAC
Transient: ANSI/IEEE C37.90.1
CMV, Input to Output 1500Vrms max  
Transient, Input to Output ANSI/IEEE C37.90.1  
CMR (50Hz or 60Hz) 120dB  
NMR 70dB at 60Hz  
Stability Offset: ±20ppm/ºC
Gain: ±75ppm/ºC
Noise (Output 100kHz) 250µVrms  
Bandwidth -3dB 3Hz  
Response Time, 90% Span 150ms  
Output Range 0 to +5V  
Output Protection (Transient) Continuous Short to Ground
ANSI/IEEE C37.90.1
Cold Junction Compensation Accuracy, 25ºC: ±1.25ºC
Accuracy, -40ºC to +85ºC: ±8.30ºC
Power Supply Voltage +5VDC ±5%  
Power Supply Current 30mA  
Power Supply Sensitivity ±100ppm/%  
Mechanical Dimensions 28.1mm × 41.9mm × 10.2mm  
Operating Temperature: -40ºC to +85ºC
Storage Temperature: -40ºC to +85ºC
Relative Humidity: 0 to 95% Noncondensing
DI-8B47 Specifications DI-8B47 Specifications

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