Scully Multiple Point Liquid Level Detection System (ST-15 WX)

Safe, reliable, high- and low-level warning and spill prevention system for storage tanks

The system incorporates Dynamic Self-Checking circuitry which monitors the controller, wiring, connections, and sensors for faults 30 times per second for maximum safety
The sensors wired to a control unit provide high level detection for a wide variety of petroleum and chemical products

Sounds an audible alarm and/or controls pumps and valves for automatic shutdown when the sensors detect liquid or a fault in the system

As a high level warning and emergency shut-down system, it operates independently from your gauging system to ensure that inventory inaccuracies do not compromise the safety of your operation.

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Description
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Variants
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Benefits

The WX System provides for the capability of alarms as well as controlling pumps and valves for immediate, automatic shutdown of product flow

Monitors from 3 –12 sensing points depending on model. Well suited for multiple fixed storage tank applications where individual display and/or output control is required.

Uses output sensors approved as intrinsically safe for use in Class I, Division 1, Group C, and D hazardous locations

Features NEMA 4 style watertight housings

Works in conjunction with either Scully field-proven thermistor or two-wire optic sensors

AYTC is an authorized full service distributor of Scully products. Scully is the market leader in overfill prevention systems, retained product monitoring, vehicle grounding, level alert notification and vehicle to terminal communications.

The ordering information below is for FM and FMC approved units. For International ATEX and SIL approved models see:

Control Units

Part Number	Description	DIM X	DIM Y	Depth
07851 ST-15-WX3	Three-Channel Sensing Point Control Unit	16″	24″	7.25″
07852 ST-15-WX4	Four-Channel Sensing Point Control Unit	16″	24″	7.25″
07853 ST-15-WX5	Five-Channel Sensing Point Control Unit	24″	30″	7.25″
07854 ST-15-WX6	Six-Channel Sensing Point Control Unit	24″	30″	7.25″
07855 ST-15-WX7	Seven-Channel Sensing Point Control Unit	24″	30″	7.25″
07856 ST-15-WX8	Eight-Channel Sensing Point Control Unit	24″	30″	7.25″
07857 ST-15-WX9	Nine-Channel Sensing Point Control Unit	30″	36″	7.25″
07858 ST-15-WX10	Ten-Channel Sensing Point Control Unit	30″	36″	7.25″
07859 ST-15-WX11	Eleven-Channel Sensing Point Control Unit	30″	36″	7.25″
07860 ST-15-WX12	Twelve-Channel Sensing Point Control Unit	30″	36″	7.25″

Product Range:	Gasoline through #6 oil, waste oil, chemicals, water, etc. Consult Scully for specific application questions.
Controls:	Alarm test push button; alarm silence circuit with push button and automatic reset
Indicator Lights:	Green = Power On; Red = Alarm Condition
Response Time:	High-level: .05 seconds maximum
Response Time:	Low-level: 3-7 seconds
Enclosure:	NEMA 4 style for indoor/outdoor use
Power Requirements:	115 VAC, +/- 15%, 50–60HZ, 20 watts maximum. Also available in 240 VAC models; consult Scully for details
Electrical Connections:	Internal Terminal Strips
Output Provisions:	External Alarm, 115VAC, 3 A max. Individual channel SPDT contacts, rated 5A- 250 VAC
Compatible Sensors:	Refer to technical data sheets; 60635, 60715
Intrinsic Safety Information:	The ST-15-WX control units can be mounted in any non-hazardous area and utilize oil tight controls and indicators. Internal circuitry provides intrinsically safe (I.S.) output, for probe connections. This output is rated for Class I, Div 1, Group D hazardous areas.
SIL Certification:	IEC 61508 Certified SIL2 HFT=0 SIL3 HFT=1
Chemical Applications:	Refer to technical data sheet 67100

The Scully Model 15 ST-15-WX Liquid Level Detection System features individual control channels to monitor from 2 to 12 sensing sensors. The ST-15-WX offers all these advantages:

Dynacheck- automatic and continuous self-testing circuitry which monitors the controller wiring, connections and sensors for faults 30 times per second.
Signals an audible alarm and/or controls pumps and valves for automatic shutdown.
Monitors from 2 to 12 total sensing points depending on model.
Provides liquid level detection for a wide variety of petroleum and chemical products.
Uses output sensors approved as intrinsically safe for use in Class 1, Division 1, Group D hazardous environments.
Features MEMA 4 Style Watertight housings.
Works in conjunction with either Scully field-proven thermistor or Instant-ONTM optic sensors.