DS3800NCJA - Cold Junction Interface Card

DS3800NCJA - Cold Junction Interface Card DS3800NCJA - Cold Junction Interface Card

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Part Number: DS3800NCJA
Manufacturer: General Electric
Series: Mark IV
Product Type: Cold Junction Interface Card
Number of channels: 12
Operating temperature: -30 to 55 degrees Celsius
Size: 8.25 cm high x 4.18 cm
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States


DS3800NCJA is a Cold Junction Interface Card manufactured and designed by General Electric as part of the Mark IV Series used in GE Speedtronic Gas Turbine Control Systems. A cold junction interface card, also known as a CJIC, is a component used in temperature measurement systems. It is specifically used in conjunction with thermocouples, which are temperature sensors that generate a voltage signal proportional to the temperature being measured. Thermocouples work based on the principle of the Seebeck effect, which states that when two dissimilar metals are joined together at two different temperatures, a voltage is generated at the junction. One of the junctions is the "hot" junction where the temperature is being measured, while the other junction is the "cold" junction, typically kept at a reference temperature. The cold junction interface card is responsible for compensating for the temperature at the cold junction, ensuring accurate temperature measurements. It measures the temperature at the cold junction and applies appropriate compensation techniques to account for the voltage generated at the hot junction. This compensation is necessary because the voltage generated by the thermocouple is a function of the temperature difference between the hot and cold junctions.


The features of a cold junction interface card (CJIC) can vary depending on the specific model and manufacturer. However, here are some common features that you might find in a CJIC:

Cold Junction Temperature Measurement: The CJIC typically includes a temperature sensor or circuitry to measure the temperature at the cold junction. This measurement is essential for accurate compensation of the thermocouple voltage.

Compensation Algorithms: The CJIC incorporates compensation algorithms to calculate and apply the necessary adjustments to account for the temperature at the cold junction. These algorithms take into account the characteristics of the specific thermocouple being used.

Amplification and Filtering: To enhance the accuracy and quality of the temperature measurement, the CJIC may include amplification and filtering circuitry. Amplification helps boost the low-level voltage signal from the thermocouple while filtering minimizes noise and interference.

Integration with Data Acquisition Systems: CJICs are often designed to work seamlessly with data acquisition systems or other temperature measurement equipment. They may have compatible interfaces or protocols to facilitate integration and data exchange.

Temperature Range and Accuracy: CJICs have specified temperature ranges within which they can accurately measure and compensate for temperature variations. The accuracy of the CJIC is typically specified in terms of the maximum error or deviation from the true temperature.

WOC maintains the largest inventory of Replacement parts for GE Speedtronic control systems. Additionally, we offer warranty-backed unused and rebuilt boards as well as board repairs for your damaged ones. For your OEM needs, our team of professionals is available around-the-clock. We at WOC are happy to help you with any needs you may have in terms of automation. Please contact our team by phone or email for pricing and availability on any components and repairs.


What is the purpose of a cold junction interface card?

A cold junction interface card is used to compensate for the temperature at the cold junction of a thermocouple. It measures the temperature at the cold junction and applies compensation algorithms to ensure accurate temperature measurements.

How does a CJIC compensate for the cold junction temperature?

The CJIC measures the temperature at the cold junction using an onboard temperature sensor or circuitry. It then applies compensation algorithms to adjust the thermocouple voltage reading based on the known characteristics of the thermocouple being used.

What is the temperature range of a typical CJIC?

The temperature range of a CJIC depends on the specific model and manufacturer. They can support a wide range of temperatures, from sub-zero temperatures to several hundred degrees Celsius, depending on the intended application.