Honeywell 5821 Wireless Temperature Sensor and Flood Detector

The Honeywell 5821 Wireless Temperature Sensor and Flood Detector is the ideal solution for protecting your home or business from unexpected temperature fluctuations and flood conditions. Designed for use in environments such as bathrooms, laundry rooms, kitchens, basements, and more, this versatile device helps prevent damage caused by extreme temperatures and water exposure. With the ability to monitor multiple temperature conditions and detect flooding, the 5821 offers comprehensive protection and peace of mind.

This advanced sensor offers five selectable temperature ranges: Cold (45°F), Warm (75°F), Hot (95°F), Refrigerator Failure (42°F), and Freezer Failure (10°F). It can also detect flooding when water covers the external probe. Whether used as a standalone device or integrated with Honeywell's Total Connect® Remote Services, the 5821 can send instant alerts via email or text message, enabling you to take swift action to prevent costly damage. Its wireless design ensures easy installation and flexibility, while its long-lasting battery provides up to 10 years of use with minimal maintenance.

Compatible with Honeywell's 5800 Series wireless receivers, this device is perfect for adding an extra layer of protection to your security system. The sensor includes a built-in "swinger suppression" feature that ensures accurate temperature readings by maintaining a 3°F difference between fault and restore points. With the flexibility to monitor both temperature and flooding simultaneously, the 5821 is an essential tool for safeguarding your home or business.

Key Features

• Monitors temperature fluctuations and flooding in critical areas.
• Five selectable temperature ranges (Cold, Warm, Hot, Refrigerator Failure, Freezer Failure).
• Flood detection with external probes (470PB or FP280).
• Compatible with Honeywell Total Connect® Remote Services for email and text alerts.
• Up to 10-year battery life for reduced maintenance.
• Wireless design for easy installation and placement flexibility.
• “Swinger Suppression” feature for accurate readings with a 3°F temperature difference between fault and restore points.

Technical Specifications

Sensor Parameters:
Cold Temperature Detector 45°F – When temperature drops below 45°F for >10 minutes
Warm Temperature Detector 75°F – When temperature rises above 75°F for >10 minutes
Hot Temperature Detector 95°F – When temperature rises above 95°F for >10 minutes
Refrigerator Failure Detector 42°F – When temperature rises above 42°F for >30 minutes
Freezer Failure Detector 10°F – When temperature rises above 10°F for >30 minutes
Flood Sensor – When 1/4" inch of water is covering the 470PB or FP280 probe
“Swinger Suppression” (Hysteresis) of 3°F – Temperature difference between fault and restore points
Power:
One 3V battery (included)
Replace only with ADEMCO #466, Panasonic CR123A, Sanyo CR123A, Duracell DL123A, Tekcell CR123A, or Varta CR123A (Lithium Manganese Dioxide)
Operating Temperature:
14°F to 104°F (-10°C to 40°C)
Operating Frequency:
345 MHz ± 85 KHz
Range of Response Time:
+50%, -20%
10-minute setting (8-15 min)
30-minute setting (24-45 min)
Dimensions:
1.6" W x 3.1" H x 1.0" D (max protrusion)
40.64mm x 78.74mm x 25.4mm
Compatibility:
Compatible with all 5800 Series wireless receivers
Agency Listings:
FCC Part 15
DOC RSS-210

What's Included:

• Honeywell 5821 Wireless Temperature Sensor & Flood Detector
• One 3V Battery (Pre-installed)
• External Probe Options: FP280 or 470PB for Flood Detection
• Quick Start Guide