Cleveland Controls 21121-112 Pressure Probe

The Cleveland Controls 21121-112 is a professional-grade total pressure probe designed for high-accuracy impact pressure sensing in commercial and industrial HVACR systems. Engineered with a 4-inch insertion length, this duct pressure probe specifically captures the total pressure of the airstream by facing the probe tip directly into the airflow. This technician-ready component features a 1.25-inch barbed end sized for 1/8-inch to 1/4-inch ID flexible tubing, ensuring a secure, leak-proof connection to your air pressure sensing switches or differential pressure controllers. The 1.5-inch mounting flange includes four pre-drilled 3/16-inch holes with a 1-inch center-to-center distance, streamlining installation on ductwork. Built for durability in demanding environments, the 21121-112 probe is an essential tool for contractors performing airflow proving, duct static pressure monitoring, and system balancing to ensure peak HVAC performance and safety compliance.

Key Benefits

• Precise Impact Sensing: Specifically designed to measure total (impact) pressure by positioning the 4-inch pickup tube upstream.
• Universal Compatibility: Seamlessly integrates with Cleveland Controls AFS, DFS, and RSS series air pressure switches.
• Secure Hose Attachment: Features a 1.25-inch barbed fitting that prevents tubing disconnects in high-vibration environments.
• Simplified Mounting: The integrated 4-hole flange provides a stable, surface-mount solution for immediate duct attachment.

Common Questions

What is the difference between this and a static pressure probe?
The 21121-112 is a "total pressure" or "impact" probe. Unlike a static probe that measures pressure exerted on the duct walls (perpendicular to flow), this probe faces into the airstream to capture the kinetic energy of the moving air plus the static pressure.

What size tubing should I use with this probe?
This model features a 1/4-inch barb that is compatible with standard 1/8-inch to 1/4-inch inner diameter (ID) flexible vinyl or neoprene tubing commonly used in HVAC control circuits.

Does this include mounting hardware?
This SKU typically includes the probe with the integrated flange and the barbed adapter. Mounting screws for the duct surface are generally sourced separately based on the specific duct material (e.g., sheet metal screws).

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.