Automation Components Inc (ACI) A/CP-I-2.5-GD Sensor

The Automation Components Inc (ACI) A/CP-I-2.5-GD Sensor is a high-performance 10K Type II thermistor specifically engineered for immersion temperature sensing in HVAC Building Automation Systems (BAS). Featuring a 2.5-inch stainless steel probe, this NTC temperature sensor utilizes a proprietary double encapsulation process to eliminate moisture infiltration, a common cause of sensor drift and field failure. The unit is housed in a durable galvanized metal enclosure (NEMA 1 rated) and includes 1/2" NPT male threads for secure installation. Standardized with 14-inch etched Teflon lead wires, it provides superior chemical resistance and thermal stability across an operating range of -40 to 302°F. Ideal for chilled water systems, hot water tanks, and boiler control, this sensor ensures accurate, non-linear resistance output for critical hydronic HVAC monitoring. Note that welded thermowells are included with this model but are not intended for high-velocity or high-pressure applications where machined wells are required.

Key Benefits

• Double Encapsulation: Protects the 10K Type II thermistor element from moisture and condensation, ensuring long-term reliability.
• Rugged Construction: The galvanized metal box provides a robust housing for light industrial and commercial HVAC applications.
• Chemical Resistant Leads: Etched Teflon lead wires offer excellent durability and prevent insulation breakdown in harsh environments.
• Precision Accuracy: Delivers high-precision immersion temperature sensing with a ±0.36°F (0.2°C) accuracy at standard operating temperatures.
• Versatile Integration: Compatible with most major Building Automation Systems and chiller plant controllers.

Common Questions

Can this sensor be used in moving water or high-pressure steam lines?
The included welded thermowell is designed for static or low-velocity fluids. For high-pressure service or high-velocity water movement, a machined thermowell should be used to prevent fatigue failure caused by wake frequency.

What do the lead wire colors signify on ACI sensors?
ACI uses specific lead wire colors to differentiate sensing elements. For the A/CP-I-2.5-GD, the white and green wires identify it as a 10K Type II thermistor.

Are these sensors suitable for outdoor use?
The "-GD" version features a NEMA 1 galvanized enclosure intended for indoor use. For outdoor or wash-down applications, a NEMA 3R or NEMA 4X rated enclosure is recommended.

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.

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