Fenwal 12-G28021-005-07 Sensor

The Fenwal 12-G28021-005-07 Detect-A-Fire® Sensor is a high-precision, rate-compensated heat detector designed for critical fire suppression and overheat monitoring. Engineered to activate at a fixed temperature of 450°F (232°C), this Close on Rise sensor utilizes a Single Pole Single Throw (SPST) contact configuration that remains open until the setpoint is reached. Built for vertical mounting, the unit features a 300 stainless steel shell and coupling mounting head, ensuring maximum corrosion resistance in harsh industrial environments. Its green color coding provides immediate visual identification for technicians managing multi-zone fire alarm systems. With a tolerance of ±15°F, this hermetically sealed device responds accurately to both rapid fire growth and slow smoldering heat, preventing the thermal lag common in standard fixed-temperature detectors. This UL, cUL, and FM approved sensor is essential for paint spray booths, engine compartments, and commercial range hoods where rate-compensation is a technical requirement.

Key Benefits for Technicians:

• Rate-Compensated Performance: Eliminates thermal lag by reacting to the rate of temperature rise, ensuring activation at the precise 450°F setpoint regardless of fire growth speed.
• Rugged Stainless Steel Construction: The 300 Series stainless steel housing is designed for longevity in high-heat and corrosive atmospheres.
• Vibration and Shock Resistance: The hermetically sealed, tamper-proof design ensures operational integrity in heavy machinery and power generation applications.
• Standardized Integration: Features a 1/2-14 NPT thread for seamless installation into existing fire suppression release or alarm circuits.
• Reliable Switching: The SPST contacts are rated for high-reliability triggering in both commercial and industrial fire panels.

Common Questions Regarding Fenwal Detect-A-Fire® Sensors:

What does 'Close on Rise' mean for this specific model?
In the Fenwal 12-G28021-005-07, the electrical contacts are normally open. When the ambient temperature reaches the 450°F threshold, the contacts close to complete the circuit, typically triggering a fire suppression discharge or an alarm panel.

Can this sensor be mounted horizontally?
This specific model is calibrated for vertical mounting. Installing a vertical-mount sensor in a horizontal orientation can affect the rate-compensation accuracy and may void compliance with local fire codes.

Why is the sensor color-coded green?
Fenwal utilizes color coding on the hex nut to identify temperature ratings at a glance. Green indicates a 450°F setpoint, allowing for quick verification during field inspections or replacements.

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.