Sensus 121-12-2 Regulator

The Sensus 121-12-2 Regulator is a heavy-duty 2 inch NPT gas pressure regulator engineered for high-capacity commercial and industrial combustion systems. This standard spring-loaded regulator features a rugged cast iron body designed to handle natural gas, LP vapor, and air with a maximum inlet pressure of 60 PSIG. Utilizing external sensing, the Sensus 121-12-2 provides superior gas pressure regulation and sensitivity, specifically configured with a 12 to 28 inch WC outlet pressure range. Formerly branded under Rockwell, Equimeter, and Invensys, this unit is built for demanding applications including large burners, boilers, and furnaces where precise low-pressure gas control and positive dead-end lockup are critical for system safety. The internal diaphragm-actuated design ensures stable performance across varying flow rates, making it a reliable choice for HVAC contractors and industrial gas technicians managing high-demand loads.

Technical Benefits for Professionals

• Precise Pressure Control: The external static pressure sensing line allows for accurate downstream monitoring, minimizing droop and boosting efficiency in commercial gas meter sets.
• Heavy-Duty Construction: Features a durable cast iron body and 1 inch NPT screened vent to withstand outdoor environments and rigorous industrial cycles.
• Positive Lockup: Ensures zero-leakage gas shutoff during no-flow conditions, protecting downstream equipment and preventing high-pressure surges.
• Versatile Application: Optimized for natural gas and propane (LPG) service, providing a wide low-pressure output range of 12-28" WC.
• Ease of Maintenance: The Sensus 121 series design allows for straightforward orifice and spring inspections without removing the entire valve body from the line.

Common Questions

What is the maximum inlet pressure for the Sensus 121-12-2 for commercial use?
This regulator is rated for a maximum inlet pressure of 60 PSIG. However, for optimal gas regulation performance and to prevent tripping safety devices, technicians should verify the specific orifice size and required outlet pressure setting during installation.

Can the 121-12-2 be used for propane service?
Yes, the Sensus 121-12-2 is fully compatible with LP gas (propane) and other non-corrosive gases. It is frequently used in industrial propane setups providing 12-28" WC to high-BTU appliances.

How do I install the external sensing line on this regulator?
Proper Sensus regulator installation requires the external sense line to be connected to the downstream piping, typically 5 to 10 pipe diameters away from the regulator outlet, to ensure the pressure sensing diaphragm receives a stable, non-turbulent reading.

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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.