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Module enhances temperature measurement accuracy

Posted: 05 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:TT electronics? BI Technologies? cold junction compensation? 143-131A? CJC module?

Cold junction compensation module from BI Tech

TT electronics BI Technologies Electronic Components Division has developed a cold junction compensation (CJC) module, providing design engineers a device to enhance the accuracy of temperature measurements. Designated the 143-131A model, the module uses a PN junction that enables accurate temperature measurements when used with standard thermocouples.

According to Mike Ochoa-Hougan, hybrid program manager for BI Technologies' Electronic Components Division, the CJC module provides a cost-effective method for obtaining accurate temperature readings. "The 143-131A module is compatible with common thermocouples, to accurately correct for the temperature of the cold junction," said Ochoa-Hougan. "The module is available in a standard three-terminal package, making it compatible with most DAQ manufacturers' mounting boards and terminal blocks."

The CJC module features laser-trimmed accuracy as well as an environmentally stable, robust construction that includes a ceramic base and hybrid technology to ensure thermal equilibrium. According to Ochoa-Hougan, when the module is affixed to the cold junction terminal block of a thermocouple circuit and appropriate excitation is provided, it will generate an accurate offset voltage to compensate for unwanted cold junction voltage.

The 143-131A CJC module features an output voltage slope of

-2.5mV/C and an accuracy of 1.25C within the operating temperature range of -40C to 85C. BI Technologies will also produce devices outside these specifications to meet customer requirements.

Typical pricing for the 143-131A CJC module is approximately $3 each in volume, with lead times from stock to 8 weeks.




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