ST-47 Groundhog Static Ground Proving Control Unit
Vehicle Static Ground Verification System
- 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 to ensure that transport vehicles are properly tied to ground before and during the loading operation
- The ST-47 Static Grounding system continuously monitors the ground connection and if that connection is lost, the ST47 will non-permit
- For stand-alone grounding without overfill prevention, choose the junction box with choice of Scully ground-proving plug or grounding clamp
- For static ground verification in conjunction with your Scully Overfill Prevention system, wire the ST-47 through your Overfill Prevention Control Monitor and plug and cable for one quick overfill protection and static grounding/earthing connection
- Direct earthing tie-in point at loading rack is available
CONTROL UNITS
| PART# | MODEL# | DESCRIPTION |
|---|
| 08508 | ST-47-115 EL | Groundhog Control Monitor with Lamps (115 VAC) |
| 08220 | ST-47-115 ELK | Groundhog Control Monitor with Lamps and Key Bypass Switch (115 VAC) |
| 08675 | ST-47-240 EL | Groundhog Control Monitor with Lamps (240 VAC) |
| 08502 | ST-47-240 ELK | Groundhog Control Monitor with Key Bypass Switch (240 VAC) |
SCULCON JUNCTION BOX w/ SCULLY GROUNDING PLUG
| PART# | MODEL# | DESCRIPTION |
|---|
| 08249 | SC-47 | Heavy-Duty Junction Box, with 20′ straight cable and ground proving plug for connection to vehicle-mounted ground proving ball (independent system) |
| 08567 | SC-47CC | Heavy-Duty Junction Box, with 32′ coiled cable and ground proving plug for connection to vehicle-mounted ground proving ball (independent system) |
| 08653 | SC-47CC/D | Heavy-Duty Junction Box, with 32’ coiled cable and ground proving plug with additional circuitry for deadman switch; aviation applications |
SCULCON JUNCTION BOX W/SCULLY GROUNDING VERIFICATION CLAMP
| PART# | MODEL# | DESCRIPTION |
|---|
| 08815NV | ST-47CC/CLMP | Sculcon Junction Box, with grounding clamp and 32’ coiled cable |
| 09333 | ST-47/CLMP | Sculcon Junction Box, with grounding clamp and 20’ straight cable |
ACCESSORIES & REPLACEMENT PARTS
| Part# | Description |
|---|
| 08274 | Ground Ball, truck-mounted electronic ground proving ball for independent grounding system |
| 08560 | Ground Bolt, truck-mounted electronic ground proving bolt for wiring to overfill prevention socket |
| 08566 | Coiled Cable, replacement plug and 32′ coiled cable assembly for SC-47 |
| 08219 | Straight Cable Replacement Plug and 20′ Straight Cable Assembly for SC-47 |
| 08565 | Plug, replacement plug only for SC-47 |
| 09511 | Module 115, replacement module for 115 VAC models |
| 27005 | Bulb, 135V, replacement indicator lamp bulb for 115 VAC older models |
| 09384 | LED Bulb- Red LED Candelabra for 120V |
| 09512 | Module 240- Replacement Module for 240 VAC Models |
| 27006 | Bulb, 250V- Replacement Indicator Lamp Bulb for 240 VAC Models |
| 09385 | LED Bulb- Green LED Candelabra for 120V |
| 08863 | Deadman Control- Deadman Switch with Coiled Cable |
For replacement parts for The Grounding Verification Clamp unit, please see Ground Verification Clamp and Cable Unit data sheet
Some applications such as rail lines and pipelines may also have stray currents present. In these situations, the rail or pipeline must be bonded to ground independently from the Scully ST-47 system.
| Operation Temperature: | -40˚ to +140˚ F (-40˚ to +60˚ C) |
| Enclosure: | Explosion-Proof Weather-Proof Housing, suffix “E” |
| 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. |
| ST-47–240 Models: 208–240 VAC, 50/60 Hz.0.125 Amperes maximum. |
| Shipping Weights: | ST-47 ELK; 26 lbs (12 kgs) |
| ST-47 EL; 26 lbs (12 kgs) |
| SC-47; 9 lbs (4 kgs) |
| 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. |
