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Nelson™ Heat Trace SMGS-1 Gutter Sensor
Nelson™ Heat Trace SMGS-1 Gutter Sensor detects moisture on roofs and in gutter.
Nelson™ Heat Trace SMGS-1 Gutter Sensor


Certifications and Compliances
cULus Listed: Ordinary Locations
Working Temperature
-40 °C to +70 °C (-40 °F to +160 °F)
Storage Temperature
-40 °C to +70 °C (-40 °F to +160 °F)
Relative Humidity
0 to 100%
Power Supply Voltage
24 Vac
Maximum Amperage
500 mA


  • Roof moisture detection is made with the unique sensor wire design; gutter moisture detection is made by the traditional sensing grid on the bottom of the SMGS-1 housing
  • The SMGS-1 housing sits directly in the gutter and the sensor wire is secured to the roof
  • The combination roof, Gutter detection system provides quick detection of potentially damaging roof, gutter icing conditions
  • As soon as moisture is detected, the SMGS-1 sends a signal to the SMMC-3 to energize de-icing cables
  • The SMGS-1 Sensor operates on low voltage provided by the SMMC-3 Control Panel and includes 3 m (10 ft) of wire for connection back to the SMMC-3 as well as mounting hardware
  • Connection wire may be extended up to 152.4 m (500 ft) with an appropriately rated 18-20 AWG 3-wire unshielded cable