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As part of its continually expanding family of SensorLex^® 8B isolated analog signal conditioners, Dataforth Corporation of Tucson, AZ, offers the 8B34 linearized 2- or 3-wire RTD input modules, the 8B35 linearized 4-wire RTD input modules, and the 8B36 potentiometer input modules.

Each 8B34 input module isolates, filters, amplifies and linearizes a single channel of temperature input from an RTD and provides a high-level analog voltage output. These modules interface to 100 ohm platinum RTDs and can be used in any process, industrial or other, that requires precise measurement of temperature.

The 8B35 modules are also used to measure temperature, but are designed for applications requiring ultimate precision. The 8B35 uses a 4-wire measurement technique that almost completely eliminates measurement errors due to leadwire resistance. These modules are used when leadwires are extremely long or different gage wires. Like the 8B34, the 8B35 interfaces to 100 ohm platinum RTDs.

The 8B36 interfaces to potentiometers and slidewires using a 2- or 3-wire connection. Sensors with this format include tension transducers, level indicators, rotary or linear position transducers, accelerometers, and pressure transducers. The 8B36 module interfaces to potentiometers up to 10,000 ohms and provides ±0.05% measurement accuracy and ±0.02% linearity.

Download the 8B34 datasheet, the 8B35 datasheet, and the 8B36 datasheet.

Excitation for the RTD in the 8B34 modules and for the potentiometer in the 8B36 is provided from the module using two matched current sources. With a 3-wire connection, this method allows equal currents to flow through the sensor leads, canceling the effects of lead resistances. In the 8B35, RTD excitation is provided from the module using a single precision current source. Excitation currents are small in all of the modules, thereby minimizing self-heating of the sensor - a potential source of measurement error.

Other features of the 8B34, 8B35, and 8B36 include:

• High-Level Voltage Outputs
• 1500Vrms Transformer Isolation & 240Vrms Field-Side Protection
• 3-Pole Low-Pass Filtering
• Low Output Noise
• Low Drift with Ambient Temperature
• -40°C to +85°C Operating Temperature Range
• CE Compliant
• Other Agency Approvals Pending
• Mix and Match Module Types on Backpanel

Since its introduction, the SensorLex^® 8B family has grown to include 17 family groups with a total of 102 different modules. Measuring only 1.11" x 1.65" x 0.4" (28.1mm x 41.9mm x 10.2mm), the 8B signal conditioner is ideal for embedded or portable applications.

Housed in a solid, potted thermoplastic plug-in-the-panel package with a flammability rating of UL-94 V-0, the 8B family is specifically designed to protect user equipment, while reducing electrical noise and enabling convenient system expansion and repair. All 8B modules offer dimensional stability over temperature, chemical resistance, and excellent stability over time; they do not require recalibration. All models meet the requirements of EN61000-6-4 (radiated/conducted emissions) and EN61000-6-2 (ESD/RF/EFT immunity).

About Dataforth Corporation:

Dataforth was established in 1984 and is the world leader in signal conditioning, data acquisition, and data communication products for industrial applications. Worldwide, our electronic data acquisition, signal conditioning, and data communication products provide rugged signal and data integrity and wide spectrum accuracy. The Dataforth Quality Management System is ISO9001:2000 registered.

For additional information, call 800-444-7644 toll-free, email sales@dataforth.com, or visit our website at www.dataforth.com.