ST-15 Overfill Prevention Control Unit
Single Point Overfill Prevention Control Unit
- Features two-wire optic or thermistor sensing
- Mounted at a loading rack or fill station for connection to a single compartment tank vehicle
- Features Dynacheck® circuitry for automatic and continuous self-checking of all system components
- Will not permit loading under any fault or wet sensor conditions
- Signals for automatic shut-off of product flow within a half-second of detecting an overfill condition
- Ideal overfill prevention for single compartment refuelers, tank cars, or hazardous liquids tank trailers; the ST-15 System is an excellent choice for rail car loading with portable cane sensors
- The only monitor that supports Scully three-wire, high-temperature sensors, allowing for a sensing of a wide range of petroleum products and chemicals
- Easy connection to vehicles through the Scully junction box and plug and cable units
- 30 years of proven, dependable performance
- For additional ground verification options, consult Scully for information on the Groundhog Self-Proving Grounding System
- For top-loading portable sensor options, see product page for Portable Liquid Level Sensors
CONTROL UNITS
| Part Number | Description |
|---|
| 07528 | ST-15-115-EL Single Point Controller with Explosion-proof Housing & Indicator Lamps, 115VAC |
| 07677 | ST-15-115-ELK Single Point Controller with Explosion-proof Housing, Indicator Lamps, Lockable Bypass Switch, 115VAC |
| 07640 | ST-15-240-EL Single Point Controller with Explosion-proof Housing, Indicator Lamps, 240VAC |
| 07547 | ST-15-240-ELK Single Point Controller with Explosion-proof Housing, Indicator Lamps, Lockable Bypass Switch, 240VAC |
REPLACEMENT PARTS
| Part Number | Description |
|---|
| 08756 | 120 VAC- Control circuit module only, ST-15-120H |
| 08656 | 240 VAC- Control circuit module only, ST-15-240H |
FM & CSA Approved Versions of:
| Thermistor Sensors | SP-BL, SP-BLU, SP-BLH two-wire Optic Sensors SP-TO, SP-TOM, SP-IO, SP-IR, SP-TO(SS), SP-TO(SS)HP |
| Enclosures: | Explosion-proof, weathertight. Corrosion inhibiting epoxy paint optional |
| Indicator Lamps: | Red = Power On/Non-Permit Green = Permit |
| Approvals: | XP-AIS / I / 1 / CD / T6 Ta = -40°C to 60°C; Entity – 61654; XP-AIS/ I / 1 / IIB/ T6 Ta = -40°C to 60°C; Entity 61654 Class I Zone 1 Group IIB |
| Turn on response time: | 6 – 30 seconds (typical) for thermistors. Two-wire optics turn on instantly. |
| Shutdown Response Time: | 0.5 seconds maximum |
| Power Requirements: | 105 – 130 VAC, 50-60 Hz, 20 watts maximum, 210 – 250 VAC nominal, 50-60 Hz, 20 Watts maximum |
| Connections: | Provided by internal terminal strips |
| Output Control: | One normally open volt free contact, rated 250 VAC, 5A resistive, energized when the sensor is dry. |
| Output Control Fuse: | Internal 5 Amperes. |
| Size: | Refer to Diagram for EL & ELK models. |
| Weight: | 28 lbs. (12.7 kg) EL & ELK Units |
NOTE: The Scully ST-15 is an intrinsically safe system. For maximum safety, it should be used only in conjunction with sensors manufactured by Scully not to jeopardize the conditions of the approvals.
