OVERVIEW

Official designation: Allen-Bradley 931N-T221 (Bulletin 931 Nano, Thermocouple Signal Converter)

Role/Application: A single-channel, 24V DC powered thermocouple converter that isolates and retransmits temperature signals from Type J or K thermocouples to a standard analog output.

KEY SPECS SUMMARY

Power: 24V DC nominal, 16.8 to 31.2V DC range

Interfaces / Ports: Thermocouple input, Analog output

Indicators: Sensor error detection included

Operating Temp: Minus 25 degrees C to plus 70 degrees C

Platform / Compatibility: DIN rail mounting, 6.1 mm wide

Limit: High galvanic isolation 2.5 kV AC

Lifecycle: Active product status

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the output signal options for the 931N-T221 thermocouple converter?

A: The output signal is selectable between 0/4 to 20 mA or 0/2 to 10V, configurable via DIP switches.

Wiring & Installation:

Q: Does the 931N-T221 support compensation for the reference junction temperature?

A: Yes, the unit supports both internal cold junction compensation (CJC) and external CJC.

Troubleshooting & Compatibility:

Q: What are the primary diagnostic indicators or error conditions the unit detects?

A: The module includes diagnostics for open thermocouple (sensor error) and signal errors.

Replacement & Upgrades:

Q: What is the benefit of the power DIN rail option with the 931N-T221 module?

A: The power DIN rail option is available to reduce power supply wiring to individual modules.