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1769-CJC

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Allen-Bradley 1769-CJC is a cold junction compensation sensor ordered separately for CompactLogix 5370 L2 embedded analog inputs used in thermocouple mode.
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Technical specifications for 1769-CJC

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1769-CJC
  • Product Family:
    CompactLogix
  • Product Type:
    CompactLogix Cold Junction Compensation Sensor
  • Stock:
    1
  • Accessory function:
    Cold junction compensation
  • Controller family:
    CompactLogix 5370 L2
  • Input context:
    Embedded analog input in thermocouple mode
  • Procurement scope:
    Ordered separately from the controller
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
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More Information

Overview Manuals CJC Function CJC Setup Service Check Product Applications

Features:

  • Thermocouple reference: supports cold-junction compensation for an embedded analog input
  • Separate accessory: Rockwell requires the sensor to be ordered apart from the controller
  • Configuration dependency: channel type and CJC settings govern the measurement path
Allen-Bradley 1769-CJC serves a specific measurement function on CompactLogix 5370 L2 controllers rather than acting as a general rack module.

Its reference-temperature input supports the conversion of thermocouple voltage into a usable process temperature at the embedded analog channel.

Selection and service must retain the exact catalog number, terminal position, thermocouple configuration, project settings, and commissioning evidence.

Apter Power supports document review, quotation, and procurement for the Allen-Bradley 1769-CJC CompactLogix Cold Junction Compensation Sensor.
Allen-Bradley 1769-CJC CompactLogix Cold Junction Compensation Sensor Manuals,Datasheets,Link
Important Notice: No qualified exact-model English PDF is attached. Use the complete product model in every document request.
  • Reference temperature: the sensor supplies the cold-junction value used by thermocouple conversion.
  • Embedded input: the documented application is the CompactLogix 5370 L2 analog channel.
  • Thermocouple mode: the accessory is required when that input type is selected.
  • Channel evidence: configuration and measured value must be reviewed together.
  • Project setting: cold-junction compensation must be enabled as intended for the selected channel.
  • Sensor type: the thermocouple selection must agree with the connected field device.
  • Polarity control: terminal orientation and lead polarity remain part of the approved loop drawing.
  • Filter effect: the selected channel filter influences update behaviour and acceptance timing.
  • Before removal: record the terminal position, controller identity, and project configuration.
  • Fault review: investigate open-sensor indications before replacing otherwise healthy controller hardware.
  • Controlled stimulus: apply an approved source to verify the complete input path after service.
  • Release decision: compare displayed temperature and diagnostics with the plant acceptance record.
  • CompactLogix thermocouple input: provide cold-junction compensation for an embedded channel.
  • Temperature-loop maintenance: restore the exact sensor identity without changing project intent.
  • Commissioning checks: validate reference temperature, polarity, scaling, and diagnostics together.
  • Spare planning: keep the separately ordered accessory with the applicable L2 controller record.
Description
Thermocouple measurements at a CompactLogix 5370 L2 terminal depend on the reference temperature supplied by 1769-CJC. Rockwell Automation requires this separately ordered sensor when the controller embedded analog input is configured for thermocouple operation, so the accessory belongs in the measurement design rather than the general controller package.

A missing, open, or poorly seated compensation path can shift otherwise plausible temperature values, which makes 1769-CJC part of the channel-verification record. The controller project, sensor type, polarity, terminal assignment, filter setting, and cold-junction option must describe one consistent installation before process values are trusted.

During maintenance, the safest use of 1769-CJC is to preserve its terminal position and compare cold-junction diagnostics before and after service. A controlled temperature-input check then confirms that the embedded channel follows the expected engineering value without treating this small sensor as interchangeable with unrelated thermocouple accessories.
Alternative Names
Allen Bradley 1769 CJC Allen-Bradley 1769CJC AB 1769-CJC sensor AB 1769 CJC CompactLogix CJC sensor CompactLogix cold junction sensor 1769 cold junction compensation connector CompactLogix 5370 L2 CJC 1769 thermocouple CJC accessory
Technical notes
For 1769-CJC service, preserve the CompactLogix 5370 L2 controller identity, terminal location, thermocouple type, polarity, channel filter, project configuration, and cold-junction diagnostic state. Treat an open or missing sensor as a measurement fault, then verify the restored channel with an approved temperature or millivolt source before returning control to automatic operation.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
When is 1769-CJC required on a CompactLogix controller?
Rockwell requires it when the CompactLogix 5370 L2 embedded analog input is configured for thermocouple mode, because the input needs a cold-junction reference.
Can 1769-CJC be assumed to ship with a CompactLogix 5370 L2 controller?
No. Official documentation states that the cold-junction connector is ordered separately, so receiving should verify the accessory against the complete project bill of material.
What should stop commissioning of 1769-CJC after maintenance?
Stop if the terminal position, thermocouple type, polarity, CJC setting, diagnostics, or channel value disagrees with the approved project and loop record.
Why can 1769-CJC affect a temperature value that otherwise looks believable?
Cold-junction error adds an offset to thermocouple conversion. A plausible display therefore still requires comparison with a known source and the controller diagnostic state.
Which records should accompany 1769-CJC during an input repair?
Carry the controller catalog, terminal map, channel configuration, thermocouple type, filter setting, polarity, diagnostic snapshot, and the applicable temperature-loop acceptance criteria.
How should 1769-CJC be released for automatic operation?
After seating and wiring checks, apply an approved temperature or millivolt stimulus, verify engineering value and diagnostics, document the result, and then restore the controlled process.