Product Highlights

• Interfaces to 100Ω Platinum RTDs
• Linearizes RTD Signal
• High Level Voltage Outputs
• 1500Vrms Transformer Isolation
• ANSI/IEEE C37.90.1 Transient Protection
• Input Protected to 240VAC Continuous
• 120dB CMR
• 70dB NMR at 60Hz
• Low Drift with Ambient Temperature
• CSA, FM and CE Certifications Pending
• Mix and Match Modules

View the DI-8B Module Selection Guide

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-8B34 module isolates, filters, amplifies, and linearizes a single channel of temperature input from an RTD and provides an analog voltage output.

RTD excitation is provided from the module using two matched current sources. When using a 3-wire connection, this method allows equal currents to flow through the sensor leads, cancelling the effects of lead resistances. The exciation currents are small (0.25mA) which minimizes the self-heating of the RTD.

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-8B34 module 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.

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Ordering Information, Models, and Prices

Part Number	Description	Price (US)	DATAQ Store
DI-8B34-01	-100°C to +100°C (-148°F to +212°F)	$113	Quantity:
DI-8B34-02	0°C to +100°C (+32°F to +212°F)	$113	Quantity:
DI-8B34-03	0°C to +200°C (+32°F to +392°F)	$113	Quantity:
DI-8B34-04	0°C to +600°C (+32°F to +1112°F)	$113	Quantity:
Accessories	Backplanes and Power Supplies.	N/A	Go to Accessories

Note: Pricing outside the U.S. will be higher to account for shipping, taxes, duty, currency fluctuation, local warranty and technical support in your country.
DI-8B Signal Conditioners have typical lead times of 2 weeks ARO.

Knowledge Base and Common Support Issues

The Importance of Isolation

Dimensions and Pinout

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