Watts Tekmar BACnet Snow/Ice Sensor Interface 681

BACnet Snow/Ice Sensor Interface 681

The BACnet Snow/Ice Sensor Interface 681 is meticulously engineered to detect the presence of snow/ice and seamlessly integrate with Building Automation Systems (BAS) to operate electric or hydronic snow melting systems. Leveraging tekmarĀ® sensor technology, the 681 automatically senses snow or ice and communicates with the BAS via BACnet MS/TP protocol. This allows the BAS to efficiently manage the snow melting system by automatically activating or deactivating it as needed. The 681 is suitable for a wide range of commercial applications, including hospitals, schools, airports, ski resorts, business entrances, driveways, loading docks, and shopping malls.

Key Features:

  • Automatic snow/ice detection feature ensures timely response to changing weather conditions.
  • BACnet MSTP communication enables seamless integration with Building Automation Systems for efficient control and monitoring.
  • Supports both in-slab and retrofit aerial sensors, providing flexibility in sensor installation options.
  • Warm weather shut down and cold weather cut off functions optimize system performance and protect against unnecessary operation.
  • Slab target temperature setting ensures precise control over the snow melting process.
  • Error codes provide diagnostic information for troubleshooting and maintenance purposes.
  • Melt pending indication alerts users to impending snow melting operation.
  • Supports both DIN rail and backplate mount configurations for versatile installation options.


Agency Approvals FCC Part 15, BTL Listed
Ambient Conditions Minus 4 to 122 degrees F (-20 to 50 degree C), less than 90 percent RH non-condensing, outdoor use permitted when used in NEMA 3 enclosure
Communications Type BACnet MSTP
Control Type Microprocessor control, this is not a safety (limit) control
Dimensions 6.34″ (161mm) H x 5.13″ (130mm) W x 1.30″ (33mm) D
Display 3.5″ color touchscreen
Enclosure Material PC+ABS plastic
Enclosure NEMA Rating NEMA 1
Power Supply 24 V (ac), 50 and 60 Hz