Schneider Electric (Barber Colman) ETR503 Temperature Sensor

The Schneider Electric (Barber Colman) ETR503 Temperature Sensor is a critical component for maintaining precise environmental control within commercial and industrial Continuum systems. This 10K Ohm Type 3 thermistor provides reliable, non-polarity sensitive temperature monitoring with an accuracy profile of +/- 0.4°F (+/- 0.2°C) across standard operating ranges. Designed for high interchangeability, the ETR503 eliminates the need for field calibration, making it an efficient choice for large-scale HVAC building automation deployments.

This room-mount sensor features a setpoint dial and an override pushbutton, allowing local occupants to make minor adjustments while the primary logic remains with the central controller. The unit is housed in a durable ABS plastic enclosure, suitable for drywall mounting or installation over a standard single-gang junction box. For veteran technicians, the simple 2-wire connection and screw terminal blocks ensure a rapid, secure install. Whether you are troubleshooting a VAV control loop or upgrading a legacy Barber Colman network, the ETR503 delivers stable, repeatable resistance outputs at a reference of 77°F (25°C).

• Continuum Compatibility: Specifically engineered for seamless integration with Schneider Electric Continuum and legacy Barber Colman controllers.
• Dual Local Control: Features an integrated setpoint adjustment and override button for enhanced zone management.
• High Precision Sensing: The 10K Type III NTC thermistor element offers superior stability and limited drift over time.
• Flexible Installation: Compact design supports direct wall or junction box mounting with all necessary hardware included.
• Broad Operating Range: Rated for temperatures between -40°F and 302°F, ensuring performance in demanding mechanical environments.

Is the ETR503 compatible with non-Schneider systems?
While designed for the Continuum architecture, any controller calibrated for a 10K Ohm Type 3 (10K-3) thermistor curve can technically interface with this sensor for standard temperature readings.

What is the purpose of the setpoint dial on this model?
The dial acts as a bias lever, typically allowing for a local offset of +/- 2 or 3 degrees, depending on the programming of the master HVAC controller.

How do I wire the override button?
The override and thermistor reference the same common terminal; however, specific terminal labels should be matched to your controller’s input configuration to ensure the momentary closure is detected correctly.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.