DI-5B34 Linearized 2- or 3-Wire RTD Input Modules

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Product Highlights

• Interfaces to 100Ω Platinum, 10Ω Copper, or 120Ω Nickel RTDs
• Linearizes RTD Signal
• High Level Voltage Outputs
• 1500 VRMS Transformer Isolation
• ANSI/IEEE C37.90.1-1989 Transient Protection
• Input Protected to 240VAC Continuous
• 160dB CMR
• 95dB NMR at 60Hz, 90dB at 50Hz
• CSA Certified

Each DI-5B34 module provides a single channel of RTD input which is filtered, isolated, amplified, linearized, and converted to a high level analog voltage output. This voltage output is logic switch controlled, which allows these modules to share a common analog bus without the requirement of external multiplexers.

The DI-5B34 module is designed with a completely isolated computer side circuit which can be floated to ±50V from power common (pin 16). This complete isolation means that no connection is required between I/O common and power common for proper operation of the output switch.

RTD excitation is provided from the module by two matched current sources. When using a three-wire RTD, this method allows an equal current to flow in each RTD lead, which cancels the effects of lead resistances. The excitation currents are very small (0.25mA for 100Ω Platinum and 120Ω Nickel, and 1.0mA for 10Ω Copper) which minimizes self-heating of the RTD.

Signal filtering is accomplished with a six-pole filter which provides 95dB of normal-mode-rejection at 60Hz and 90dB at 50Hz. Two poles of this filter are on the field side of the isolation barrier, and the other four are on the computer side. After the initial field-side filtering, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ±5%.

A special input circuit on the DI-5B34 provides protection against accidental connection of power-line voltages up to 240VAC.

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Ordering Information, Models, and Prices

Part Number	Description	Price (US)	DATAQ Store
100Ω Platinum, α = 0.00385
DI-5B34-01	-100°C to +100°C (-148°F to +212°F)	$150	Quantity:
DI-5B34-02	0°C to +100°C (32°F to +212°F)	$150	Quantity:
DI-5B34-03	0°C to +200°C (32°F to +392°F)	$150	Quantity:
DI-5B34-04	0°C to +600°C (32°F to +1112°F)	$150	Quantity:
10Ω Copper, α = 0.004274
DI-5B34C-01	0°C to +120°C (32°F to +248°F) 10Ω at 0°C	$150	Quantity:
DI-5B34C-02	0°C to 120°C (32°F to +248°F) 10Ω at 25°C	$150	Quantity:
DI-5B34C-03	0°C to 160°C (32°F to 320°F) 10Ω at 0°C	$150	Quantity:
120Ω Nickel, α = 0.00672
DI-5B34N-01	0°C to +300°C (32°F to +572°F)	$150	Quantity:
Accessories
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-5B Signal Conditioners have typical lead times of 2 weeks ARO.
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Knowledge Base and Common Support Issues

The Importance of Isolation

Dimensions and Pinout

Pass-through connections to jump a 5B module socket

How To Calibrate Strain Gage-Based Transducers Using DI-5B38 Strain Amplifiers

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