Automation Components Inc (ACI) A/1K-3W-RA-18 Sensor

The Automation Components Inc (ACI) A/1K-3W-RA-18 is a professional-grade rigid averaging temperature sensor designed for precise climate control in critical HVAC and Building Automation Systems (BAS). This unit features a 1K Ohm Platinum RTD sensing element with a standard 0.00385 temperature coefficient, ensuring stable resistance-to-temperature linear output. Built with a three-wire configuration, the sensor effectively compensates for lead wire resistance, providing superior accuracy in large-sized ducts and Air Handling Units (AHUs). The 18-inch 304 stainless steel probe utilizes multiple sensing points wired in a series-parallel circuit to deliver a true average temperature reading, mitigating the risk of false cycling caused by stratified air or localized hot spots. The integrated plastic box (PB) enclosure includes a mounting flange and a vibration-dampening foam pad, streamlining installation for contractors in high-velocity airflow environments.

Key Benefits for Contractors

• Ensures accurate discharge air temperature monitoring by averaging readings across the entire probe length.
• Compatible with most major DDC controllers requiring a 1000 Ohm RTD input.
• The three-wire RTD sensor design eliminates errors associated with long cable runs between the duct and the controller.
• Rugged stainless steel construction and rigid averaging mount design prevent probe sagging or mechanical failure in turbulent air streams.
• Optimized for zone control and precise environmental management in commercial facilities.

Common Questions

Is the A/1K-3W-RA-18-PB the same as the A/1K-3W-RA-18?
Yes, the "PB" suffix denotes the standard plastic box enclosure, and both part numbers refer to the same 18-inch rigid averaging sensor assembly.

Can this sensor be used in high-moisture environments?
While the stainless steel probe is moisture-resistant, the plastic box enclosure is designed for standard duct applications; for NEMA 4X requirements, verify if additional sealing or an alternate enclosure type is needed for your specific site conditions.

How does a three-wire configuration improve performance over two-wire setups?
The third wire allows the controller to measure and cancel out the resistance of the lead wires, which is critical for maintaining the accuracy of a platinum RTD over long distances.

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.