Compensation module ensures thermal equilibrium

Cold junction compensation module uses a PN junction that enables accurate temperature measurements when used with standard thermocouples.

Providing design engineers with a device to enhance the accuracy of temperature measurements, TT Electronics BI Technologies Electronic Components Division has developed a cold junction compensation module.

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 cold junction compensation 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 data acquisition manufacturers' mounting boards and terminal blocks".

The cold junction compensation 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 cold junction compensation module features an output voltage slope of -2.5mV/C and an accuracy of +/-1.25C within the operating temperature range of -40 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 US $3.00 each in volume, with lead times from stock to 8 weeks.

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