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Allen Bradley 1756-CJC Cold Junction Compensation Thermistors
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Product Introduction
The Allen-Bradley 1756-CJC is a ControlLogix Cold Junction Compensation (CJC) thermistor accessory designed to improve the accuracy of thermocouple temperature measurements in ControlLogix systems. It provides a stable reference temperature at the terminal junction, allowing the control system to compensate for ambient temperature variations and calculate true process temperatures more precisely.
The 1756-CJC is commonly used alongside ControlLogix thermocouple input modules to ensure measurement stability, repeatable accuracy, and reliable temperature data in industrial environments where ambient conditions may fluctuate.
Product Specifications
| Parameter | Description |
|---|---|
| Product Type | Cold Junction Compensation Thermistor |
| Function | Reference temperature compensation for thermocouple inputs |
| Sensor Type | Thermistor |
| System Compatibility | ControlLogix thermocouple input modules |
| Measurement Role | Cold junction temperature reference |
| Installation Location | Mounted at the thermocouple termination point |
| Industrial Rating | Designed for industrial automation environments |
| Signal Stability | Provides consistent reference temperature |
| Dimensions | 80 × 50 × 10 mm |
| Weight | 0.01 kg |
Applications
• Used for cold junction compensation in thermocouple-based temperature measurement systems
• Suitable for process control applications requiring accurate temperature readings
• Applied in chemical, power generation, oil & gas, and manufacturing industries
• Commonly installed in ControlLogix temperature monitoring systems
• Ideal for applications where ambient temperature variations could affect thermocouple accuracy
Advantages
• Improves thermocouple measurement accuracy by compensating for junction temperature changes
• Seamless compatibility with ControlLogix thermocouple modules
• Compact and lightweight design simplifies installation
• Stable thermal response supports repeatable and reliable readings
• No active electronics required, enhancing long-term reliability
• Designed for consistent performance in industrial control environments
FAQ
-
What is the purpose of the 1756-CJC?
It provides a reference temperature for compensating thermocouple measurements, improving accuracy. -
Which modules use the 1756-CJC?
It is used with ControlLogix thermocouple input modules that require external cold junction compensation. -
Does the CJC measure process temperature directly?
No, it measures the reference junction temperature, not the process temperature. -
Why is cold junction compensation necessary?
Thermocouples measure temperature differences, so compensation is required to determine the true process temperature. -
Where should the thermistor be installed?
It should be installed at or near the thermocouple termination point to reflect ambient junction temperature. -
Does the CJC require power?
No, it is a passive thermistor device. -
Can multiple thermocouple channels share one CJC?
Usage depends on module design; typically, CJCs are assigned per module or terminal group. -
How does ambient temperature affect thermocouple readings?
Changes in ambient temperature alter the reference junction temperature, which must be compensated. -
Is configuration required in the controller?
Yes, the thermocouple module must be configured to use external cold junction compensation. -
What happens if the CJC is not installed?
Temperature readings may become inaccurate due to uncompensated junction temperature variation.
Related Models
| Model | Description |
|---|---|
| 1756-IT6I | Isolated thermocouple input module |
| 1756-IRT8I | RTD and thermocouple input module |
| 1756-IF8 | Analog input module |
| 1756-IF16 | 16-channel analog input module |
| 1756-TBNH | ControlLogix terminal block |
| 1756-TBS6H | Thermocouple terminal block |
Popular Models
| Model | Description |
|---|---|
| 1756-L81E | ControlLogix high-performance controller |
| 1756-L83E | Advanced ControlLogix controller |
| 1756-EN2TR | EtherNet/IP communication module |
| 1756-A7 | 7-slot ControlLogix chassis |
| 1756-PA75 | ControlLogix AC power supply |
| 1756-IT6I | Isolated thermocouple input module |
| Company Information | ||||||||
| [email protected] | ||||||||
| Mobile | +8613666033393 | |||||||
| +8613666033393 | ||||||||
| 13666033393 | ||||||||
| Add | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
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