Multiple Point Liquid Level Detection System ST-15-WX Series Control Units Featuring Dynacheck®- Automatic & Continuous Self-Testing 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 StyleWatertight housings. • Works in conjunction with either Scully field-proven thermistor or Instant-ONTMoptic sensors. Setting New Standards In Safety Scully Signal Company, 70 Industrial Way, Wilmington, MA 01887 U.S.A. Tel (617) 692-8600, Fax (617) 692-8620 60633 Rev A The output control function may be reversed to alarm for a dry sensor condition rather than a wet sensor condition for low level warning. The St-15-WX enclosure includes individual red indicator lamps that light when a sensor is wetted, a power indicator lamp, an alarm acknowledge push button and alarm test push button.Once a sensor alarm is acknowledged the alarm output circuit is reset, however, the indicator lamp remains lit until the sensor is dry again. Safety The St-15-WX series controllers incorporate Scully’s unique and exclusive Dynacheck ® circuitry when connected to Scully sensors.Using pulsed signals to simulate a wet or “unsafe” condition, the monitor automatically and continuously checks the entire system operation; controller, wiring, connectors and sensors for faults thirty (30) times per second. If liquid comes in contact with the sensor tip, or in the unlikely event a fault occurs, the pulsed signals cease and the monitor signals an audible alarm and/or controls ,pumps and valves for immediate shutdown. Sensors Compatible liquid level sensors for theThe St-15-WX employ solid state thermistor and Instant-OnTM optic sensing technology. Sensors and holders constructed of aluminum or stainless steel for sensing a wide variety of liquid products including petroleum and chemicals are available.Consult the technical data sheets listed on the back for further sensor information. ST-15-WX6 Shown Description The Scully ST-15-WX series multiple point liquid level detection control units are available in two through twelve channel models.The ST-15-WX is commonly used to provide overfill protection,high level warning, low level warning and/or pump and valve control functions. They are well suited for multiple fixed storage tank and transport tank applications where individual display and/or output control is required.
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