Scully ST-47 Groundhog Static Ground Proving Control Monitor w/ Lamps

26.00 LBS
Adding to cart… The item has been added
Don't let unsure grounding methods leave you guessing. Transport vehicles should be properly tied to ground before and during the loading operation. There should never be any doubt that the grounding systems at your terminals are performing their proper function. Many systems give you little assurance of their operation. The Scully Groundhog gives you complete assurance that a proper static ground tie-in is present.


  • Self-proving technology based on Scully’s original patented design
  • Can operate in conjunction with your Scully Overfill Prevention System (ST-35® or ST-15) or as an independent ground verification unit
  • Immediately shuts down the loading operation if proper static grounding is not detected
  • Can be used with a variety of loading operations including tank trucks, rail tank cars, aircraft refuelers and tanks
  • Ensures that transport vehicles are properly tied to ground before and during the loading operation
  • Continuously monitors the ground connection and if that connection is lost, the ST47 will non-permit
  • Direct earthing tie-in point at loading rack is available - please call for details


  • Operation Temperature: -40° to +140° F (-40° to +60° C)
  • Indicators: Red-not grounded/non-permit; Green-grounded/permit
  • Response Time: 0.5 seconds maximum
  • Electrical Connections: Internal terminal strips, identified for easy installation
  • Bypass Switch: Key lockable off-on bypass switch for ELK model only
  • Output Control: One normally open user contact rated 250, 5A resistive load
  • Power Requirements: ST-47–115 Models: 105–125 VAC, 50/60 Hz. 0.250 Amperes maximum
  • Approvals: Explosion-proof with intrinsically safe ground connection outputs. Rated for Class I, Division 1, Groups C & D Hazardous (Classified) Locations, by FM Global (FM) to Canadian and United States standards


Product Manual (PDF Download)