KMC Controls STE-1402 Sensor

The KMC Controls STE-1402 is a professional-grade rigid duct temperature sensor designed for accurate single-point monitoring in commercial HVACR systems. This unit features a high-precision 10K Ohm Type III thermistor sensing element, providing a standard resistance signal compatible with most building automation systems and BACnet controllers. The sensor is encapsulated in a durable 8-inch stainless steel probe with a 1/4-inch outside diameter, ensuring rapid thermal response and long-term stability within the airstream. Housed in a flame-retardant NEMA 4X (IP65) ABS enclosure, the assembly includes a 1/2-inch NPT threaded connection for conduit integration and a foam gasket to prevent air leakage at the mounting point. With an operating range from -40 to 248??F, this duct mounted sensor is ideal for supply, return, or exhaust air monitoring where consistent performance and environmental resistance are required by mechanical contractors.

Key Benefits

• Precision 10K Type III thermistor ensures +/- 0.36??F accuracy for tight environmental control.
• Rugged 8-inch rigid probe constructed from 304 stainless steel resists corrosion and physical stress.
• NEMA 4X rated enclosure protects internal connections from moisture and airborne contaminants.
• Standard two-wire polarity insensitive leads simplify installation and integration with various field controllers.
• Integrated 1/2-inch NPT conduit connection and foam gasket provide a secure, airtight seal on the duct wall.

Common Questions

What is the difference between Type II and Type III 10K sensors?
The Type III thermistor used in the STE-1402 has a different resistance-temperature curve than Type II. While both are 10,000 ohms at 77??F, they diverge at other temperatures, so ensure your controller is configured for a Type III 10K curve to avoid offset errors.

Can I use this sensor in outdoor air ducts?
Yes, provided it is installed within the ductwork. The ABS plastic enclosure and IP65 rating provide excellent protection, though for direct outdoor exposure without duct protection, a dedicated sun-shielded outside air sensor is typically recommended.

How should the probe be positioned for the best accuracy?
For the most reliable reading, the 8-inch probe should be installed in a straight run of ductwork, at least several duct diameters downstream from coils, fans, or transitions to minimize the impact of laminar flow and air stratification.

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.