Scully Signal Company

What Scully Signal Company does

Scully Signal Company is a privately held, 90-year-old manufacturer headquartered in Wilmington, Massachusetts that builds safety-rated measurement and control equipment for bulk liquid transfer and storage operations. The company specializes in overfill prevention controllers and sensors, static grounding verification systems, vehicle identification modules, and tank gauging products used by petroleum terminals, tank truck operators, railcar loaders, aviation fueling facilities, chemical handlers, government and military fuel installations, and heating oil and lube oil distributors. Its underlying platform is built around the patented Dynacheck® Dynamic Self-Checking® circuitry, which continuously monitors controllers, wiring, connections, and sensors up to 30 times per second and triggers automatic loading shutdown within 0.5–1 second of a fault or high-level condition.

The product architecture is a controller-plus-sensor ecosystem with deep cross-compatibility across generations. Terminal-side controllers include the Intellitrol®2 (an all-in-one overfill prevention, static grounding, and vehicle identification rack controller), the ST-35 multi-point optic controller, the ST-15 single-point controller, and the SIL3-certified ST-15-WX storage tank controller. These pair with a sensor family comprising two-wire and five-wire SCUL-SENSE™ optic sensors, thermistor sensors, SS316 stainless steel chemical sensors, the BioSense® retained-product sensor for biofuels, and the patent-pending Scully Connect™ Plus tool-less sensor with IP69K ingress protection. Supporting equipment includes the Groundhog™ ST-47 ground proving controller, the Vapor Connect™ vapor hose verification kit, delivery nozzles (Sculflow®, Super Nozzle), flow controls (Mark IV®, Sculmatic®), tank gauges (Econ-O-Gage®, Golden Gallon Gauge®, Snorkel®, Twis-Lok®), and diagnostic testers (Mobile Truck Tester with HazLoc approval and app connectivity, Universal Truck Tester, Rack Tester). Select products carry FM, ATEX/IECEx, CE, and exida® SIL3 functional safety certifications.

Scully operates a B2B enterprise hardware sales model using professional field sales staff who conduct on-site visits, quote-based custom configuration pricing, and multi-year contract relationships; no third-party distributors or resellers are referenced. The company is led by Katrina Scully Ohl as President and traces its founding to Francis P. Scully, indicating likely multi-generational family ownership. Customer evidence spans long-tenured enterprise accounts across petroleum (Lindell Fuels, Beardsley), tank service (Gill Tank Service since 1957, 70,000+ tanks protected), aviation (Karie Cox, 35-year career), truck repair (LeClair), refueling (4Refuel), and distribution (Sid Harvey), with a global footprint covering North America, the UK, Germany, France, Spain, and Brazil supported by a multilingual website.

Name

Scully Signal Company

Legal name

Scully Signal Company

Website

https://scully.com

Company type

Private

Founded year

1935

Operating status

Operating

Headcount range

101–250 employees

Short description

Scully Signal Company manufactures overfill prevention, static grounding verification, and tank gauging systems for petroleum terminals, tank truck operators, aviation, chemical, railcar, and military fuel-handling operators worldwide from its Wilmington, Massachusetts headquarters.

Ownership category

akta.pro rank

Product category

Industrial Safety Equipment

NAICS

Other Measuring and Controlling Device Manufacturing (334519), Measuring, Dispensing, and Other Pumping Equipment Manufacturing (333914)

SIC

Measuring & Controlling Devices, Nec (3829), Totalizing Fluid Meters & Counting Devices (3824)

akta.pro primary industry

Filling & Dosing Machines (Liquid/Powder/Solid) (IMAHAOAF)

akta.pro secondary industries

Sensors & Feedback Devices (Pressure, Flow, Position, Encoders, Transducers) (IMAHAGAK), Bulk Packaging Filling/Discharge Systems & Handling Aids (Spouts, Lifting, Dischargers) (IMALAGAI)

Keywords

• Overfill prevention systems
• Grounding verification equipment
• Tank level gauges
• Liquid transfer safety
• Loading rack controllers

Headquarters

HQ city

Wilmington

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Technology or R&D, Operations, Marketing or Sales

Revenue model

1. Hardware Sales - Overfill Prevention Equipment: Sale of safety-rated measurement and control equipment including overfill prevention controllers, sensors, plugs, cables, sockets, and accessories for terminals, tank trucks, railcars, and storage tanks. Products are sold as complete systems with various sensor configurations and monitoring capabilities.
2. Ground Verification Equipment: Static ground proving controllers (ST-47 Groundhog™), ground verification clamps, cables, and accessories for ensuring proper grounding during liquid transfer operations.
3. Delivery Equipment & Accessories: Flow control valves, delivery nozzles (Sculflow®, Super Nozzle), hose swivels, spouts, and portable fill devices for liquid transfer operations.
4. Tank Level Gauges & Alarms: Tank level gauges (Econ-O-Gage®, Golden Gallon Gauge®, Twis-Lok®, Snorkel®), fill alarms (Ventalarm®), and water detectors for storage tank monitoring.
5. Testing & Diagnostic Equipment: Truck testers, rack testers, and universal truck testers for diagnostics and compliance testing of overfill prevention and grounding systems.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels7 records

Core offering

Scully Signal Company designs and manufactures safety-rated measurement and control equipment for bulk liquid transfer operations. Its core products are overfill prevention controllers (Intellitrol®2, ST-35, ST-15, IntelliCheck®3, ST-15-WX) and associated sensors, plugs, cables, sockets, ground verification systems, delivery nozzles, flow controls, and tank level gauges used at petroleum terminals, tank trucks, railcars, and storage tanks.

Product overview

Scully Signal Company offers a comprehensive portfolio of overfill prevention, grounding verification, and tank gauging solutions for bulk liquid transportation and storage. The product line centers on safety-rated control systems including the Intellitrol®2 rack controller (all-in-one overfill prevention, static grounding, and vehicle identification), ST-35 multi-point controller, ST-15 single-point controller, IntelliCheck®3 onboard vehicle controller, and ST-15-WX storage tank controller. These core controllers integrate with a full ecosystem of sensors (Two-Wire and Five-Wire SCUL-SENSE™ optic sensors, thermistor sensors, stainless steel chemical sensors, BioSense® retain sensors, and the tool-less Scully Connect™ Plus), connection components (plugs, cables, junction boxes, sockets), and supporting equipment (Groundhog™ static ground verification, Mobile Truck Tester, delivery nozzles, flow controls, and level gauges). The products serve multiple markets including petroleum, railcar, aviation, chemical, government/military, mining, lube oil delivery, food/beverage, and heating oil delivery.

Differentiator

Problem solved

Functional benefit

Brands

• Intellitrol®2: Auto-Detect Rack Controller - the most advanced terminal overfill prevention & static ground verification system with Dynacheck® Dynamic Self-Checking® circuitry
• IntelliCheck®3
• SCUL-SENSE™
• Groundhog™
• Dynacheck®
• BioSense®
• DuoCept®
• ST-15-WX
• Scully Connect™ Plus
• T.I.M ®
• Vapor Connect™
• Sculflow®
• Scul-Guard™
• Sculmatic®
• Ventalarm®
• Econ-O-Gage®
• Golden Gallon Gauge®
• Twis-Lok®
• Snorkel®
• Whistler®
• Unifil®
• Scul-Lock™

Products and services

• Intellitrol®2 Auto-Detect Rack Controller Advanced terminal overfill prevention and static ground verification system with all-in-one overfill prevention, static grounding, and vehicle identification capabilities, featuring Dynacheck® Dynamic Self-Checking® circuitry.
• ST-35 Multi-Point Controller Multiple-point optic-sensing overfill prevention controller for terminals with five-wire optic sensor interface that monitors 1- to 12-compartment vehicles.
• ST-15 Single-Point Controller Single-point overfill prevention control unit with two-wire optic or thermistor sensing for single compartment tank vehicles, tank cars, or hazardous liquids tank trailers.
• IntelliCheck®3 Onboard Controller Tank vehicle mounted overfill prevention and retained product onboard system with enhanced features, diagnostics, and IntelliCheck® retained product monitoring capability.
• ST-15-WX Point Level Controls Safe, reliable high- and low-level warning and spill prevention system for storage tanks with SIL3 certification from exida.
• ST-47 Groundhog™ Static Ground Proving Controller Vehicle static ground verification system with self-proving technology for ensuring proper grounding during liquid transfer operations.
• Scully Vapor Connect™ Kit Verifies vapor hose connection as part of the loading permit process for terminal safety operations.
• Scully Mobile Truck Tester Mobile truck testing device with HazLoc approval for hazardous area use, supporting single-person wet tests, sharable test results, and app connectivity.
• Universal Truck Tester Universal truck tester for overfill prevention and grounding system diagnostics and compliance testing.
• Scully Rack Tester Loading rack tester for overfill prevention system testing and diagnostics.
• T.I.M® Truck Identification Module Truck identification module for vehicle-to-terminal vehicle identification safety system.
• Sculflow® Ball-Valve Delivery Nozzle Ball-valve delivery nozzle for liquid transfer operations.
• Super Nozzle High Volume Delivery Nozzle High volume delivery nozzle for bulk liquid transfer applications.
• Econ-O-Gage® Tank Level Gauges Swing-arm tank level gauges for storage tank monitoring.
• Ventalarm® Tank Fill Audible Indicators Audible fill signals for tank fill level indication.
• Unifil® Tight Fill Connection System Adaptors, caps and nozzle connectors for tight-fill liquid transfer operations.

Quantifiable outcome

• System shutdown within 0.5 seconds of detecting potential overfill condition
• +3 more outcomes

Named customers8 records

Segments10 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Civacon: Civacon (part of Holman Automotive) manufactures overfill prevention monitors, optic and thermistor sensors, grounding equipment, and API couplers for tank trucks and petroleum terminals. It competes head-to-head with Scully's IntelliCheck®3 onboard controllers and SCUL-SENSE™ sensor lines in the tank truck and loading rack segments.
• OPW (Dover): OPW is the most direct competitor to Scully, manufacturing overfill prevention, grounding verification, and vapor recovery equipment for petroleum terminals, tank trucks, and railcars. Both companies serve the same fleet operators, fuel terminals, and aviation fueling customers with overlapping product categories including optic sensors, rack controllers, and break-away couplings.
• Emco Wheaton: Emco Wheaton (part of OPW/Dover) produces loading arms, vapor recovery, overfill prevention, and dry-break couplings for road tankers, railcars, and marine vessels. It is highly comparable to Scully in serving fuel terminals and tank truck operators with safety-rated transfer equipment, though it leans more into mechanical loading arm systems.
• Husky Corporation: Husky Corporation manufactures fuel delivery nozzles, vapor recovery nozzles, and safe-breakaway couplings for petroleum and aviation fueling. It directly competes with Scully's Sculflow® and Super Nozzle product lines for retail and commercial fuel delivery operators, including airport refueling applications.
• Liquip International: Liquip International (a Fogg Filler company) manufactures overfill prevention, tank truck equipment, dry-break couplings, and fuel transfer systems for petroleum, chemical, and bulk liquid transport. It is comparable to Scully's complete overfill prevention and grounding product portfolio for hazardous liquid road and rail transport.

Broad incumbents

• Franklin Fueling Systems: Franklin Fueling Systems offers a broad portfolio of fueling infrastructure including tank gauging, leak detection, overfill prevention, and fuel management software for retail and commercial petroleum sites. It overlaps with Scully in tank level monitoring and terminal safety but operates as a broader fuel-site solutions provider rather than a specialist.
• Dixon Valve & Coupling: Dixon Valve manufactures hose fittings, couplings, valves, and fluid transfer accessories for industrial, chemical, and petroleum applications. It overlaps with Scully's Unifil® tight fill adaptors, Sculflow® nozzles, and hose swivel product lines but serves a much broader fluid handling market beyond safety-critical overfill prevention.
• Parker Hannifin: Parker Hannifin's Fluid Connectors and Instrumentation groups produce valves, fittings, sensors, and filtration used in fluid transfer, hydraulic, and pneumatic systems. While Scully's safety-rated overfill systems are more specialized, Parker is a broad incumbent in fluid handling components that competes in adjacent industrial fluid control categories.
• Gilbarco Veeder-Root: Gilbarco Veeder-Root (part of Fortive/Vontier) is a global leader in retail and commercial fuel dispensers, point-of-sale systems, tank gauges, and fuel site management. While it operates at much greater scale across fueling infrastructure, it overlaps with Scully in tank level gauging and safety monitoring for petroleum sites.

Regional players

• Banlaw: Banlaw (Australia-based) manufactures fluid transfer and management systems, including nozzles, couplers, and fuel handling equipment primarily for the Asia-Pacific region. It is comparable to Scully in fuel delivery and transfer product categories but operates in a different primary geography, with limited direct overlap in North American and European petroleum terminals.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/scullysignal
• YouTubeyoutube.com/channel/UCKhkWYIZxMyMdBaIwKr4AUQ
• Facebookfacebook.com/scullysignal
• LinkedInlinkedin.com/company/60598

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Scully Signal Company