Honeywell FS24X-911-21-1 Flame Detector for Hazardous Area Protection

Product Introduction

When a fire threatens critical industrial assets, the Honeywell FS24X-911-21-1 flame detector provides fast, reliable detection. This model is part of the FS24X series, designed for hazardous locations requiring FM, cFM, ATEX, and IECEx approvals (Class I, Zone 1). It combines a rugged aluminum enclosure with advanced optical sensing to identify flames across a wide spectral range.

Technical Specifications Breakdown

The FS24X-911-21-1 operates on an input voltage range of 18 VDC to 32 VDC, with normal current draw of 60 mA (205 mA with heater). Its maximum fire alarm current is 85 mA (235 mA with heater). The analog current output is 0 to 20 mA, user-selectable as source or sink, with fault indication at 0.0 mA and verified fire alarm at 20.0 mA. Relay contact rating is 1 Amp at 24 VDC resistive. The detector offers a field of view of 90° horizontal and 80° vertical, with sensitivity to detect a one square foot heptane reference fire at 200 feet. Spectral sensitivity spans 0.4 to 5.0 microns, and typical response time is 2 to 5 seconds.

Industry Applications

This flame detector excels in oil and gas refineries, chemical processing plants, and power generation facilities where rapid fire detection is critical. Its wide temperature range (-40°F to +185°F for standard models) and IP66/NEMA 4X rating ensure reliable operation outdoors or in washdown areas. The 4-20mA output integrates seamlessly with existing fire alarm panels and distributed control systems, reducing installation complexity.

Installation & Setup Guidance

Mount the FS24X-911-21-1 using the two 3/4" NPT conduit entries provided. Use stranded conductors from 12 AWG to 22 AWG for wiring. Ensure the detector’s cone of view is unobstructed and aimed at the protected area. For optimal performance, avoid direct exposure to intense sunlight or heat sources that may cause false alarms. The user-selectable analog output mode (source or sink) simplifies integration with various control systems.

Maintenance & Reliability

Routine inspection of the detector lens is essential to maintain sensitivity. The dirty window lens feature (2.0 mA output) alerts operators when cleaning is needed. The copper-free aluminum enclosure resists corrosion in harsh environments. Periodic verification of relay and analog output functionality ensures continued reliability. Follow the manufacturer’s guidelines for cleaning and testing intervals.

Selection Guide & Purchasing Advice

Before ordering, confirm that the FS24X-911-21-1 matches your required field of view (90° for this model) and hazardous area classification. This unit includes fault alarm and auxiliary relays, 4-20mA output, and FireBulls or Modbus RTU communication. BluePLC Industrial offers this detector as new and original in factory packing with a 12-month warranty. Contact our team to verify current lifecycle status and availability.