Automation Components Inc (ACI) A/20K-D4-PB Thermistor

The Automation Components Inc (ACI) A/20K-D4-PB Thermistor is a high-precision duct temperature sensor engineered for HVAC Building Automation and light industrial systems. This model features a 4-inch 304 stainless steel probe and a 20K Ohm NTC sensing element, providing an accuracy of +/- 0.36°F (0.2°C). Designed for rapid installation, the unit includes a flame-retardant ABS plastic box enclosure with a built-in mounting flange and a foam vibration-dampening pad. To ensure long-term reliability in high-humidity environments, the sensing element is double encapsulated to prevent moisture infiltration and sensor drift. The A/20K-D4-PB is ideal for monitoring supply, return, and mixed air temperatures within air handling units and zone control systems. Its easy-access latching system allows for quick wiring without the need for additional screws, streamlining field service and installation in complex thermal monitoring applications.

• Enhanced Moisture Protection: The double-encapsulated sensor prevents failures caused by condensation or moisture infiltration within the ductwork.
• Simplified Installation: Features a plastic box enclosure with an integrated mounting flange and an easy open/close latch system for tool-free interior access.
• High Precision Monitoring: Provides a 20K Ohm nominal resistance at 77°F, ensuring compatibility with a wide range of building automation controllers.
• Vibration Dampening: Equipped with a foam pad that reduces mechanical noise and ensures a secure seal against the duct surface.

Where should the sensor be installed for the most accurate reading?
For optimal performance, the probe should be mounted in the middle of the duct, roughly three to four duct segments downstream from any bends or obstructions to avoid air stratification errors.

What is the benefit of the 'PB' enclosure style?
The 'PB' designation refers to the Plastic Box enclosure, which is plenum-rated and features a hinged cover with a latch, making it easier to wire in tight spaces compared to traditional metal junction boxes.

Is this sensor compatible with my existing controller?
This sensor uses a 20K Ohm Type 22 thermistor curve. It is critical to verify that your BAS or controller is programmed to accept a 20K NTC input signal.

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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