Diagnostic Devices

What Diagnostic Devices does

Diagnostic Devices Inc. (DDI) is a privately held, founder-led engineering firm headquartered in Simsbury, Connecticut, founded in 1992 and operating with 1–10 employees. The company designs, manufactures, and services proprietary diagnostic systems built around partial discharge detection and electro-acoustic sensing technologies. Its core commercial platform comprises the FD²-EPT (Fault Diagnostic Device for Electrical Power Transformers) and FAN-EPT (Fault Area Network for Electrical Power Transformers) — both patented systems for detecting, locating, and on-line monitoring of partial discharge in power transformers across 6 to 16 channels and substation-wide installations of 3 to 9 transformers. Secondary product lines extend the underlying sensing technology to motors and generators (FD²-EMG), switchgear and load tap changers (FD²-SG/LTC), HV bushings (FDD-BUSH), aircraft structural integrity (DAM-AFS), and embryonic stem cell identification (GM-04 Graft Mapper).

DDI has diversified vertically into medical diagnostics through its 4th-generation eCAD device (marketed under the AngioScan sub-brand), a non-invasive electro-acoustic sensing platform that uses proprietary signal processing algorithms and DSP core hardware to detect and locate cardio and coronary vascular disease without catheterization. The company monetizes through six revenue streams: diagnostic equipment sales (hardware units across multiple configurations), on-site testing services with same-day report delivery, test equipment leasing, annual maintenance contracts (AMCs), transformer design services (5–500 MVA), and expert training with 24/7 technical support. Pricing is custom and quote-based under multi-year enterprise contracts. Customers span electrical utilities (Power Grid Corporation of India, NTPC, Southern California Edison, Northeast Utilities, Dynegy), transformer manufacturers (ABB, ProlecGE, Delta Star, North American Transformer, Ohio Transformer), the petrochemical sector via JRE in India, and cardiology clinics.

DDI operates a multi-channel go-to-market combining direct sales from its Simsbury headquarters, an exclusive international sales representative network spanning China (Shanghai Hongbang Technology), Taiwan (Precision International Corporation), Philippines (Tan Delta Electric Corporation), India (JRE Private Limited, Gen Health-Aid for medical — cancelled), and Australia (Pacific Test Equipment), plus an OEM relationship with TARIL (Transformer India). Products are deployed across 25+ countries, with notable customer validations including an ABB transformer certification in Vaasa, Finland (February 2016) and an eCAD clinical demonstration in Mumbai (July 2016). The company's competitive positioning rests on patented technology, 150+ years of cumulative staff experience with Westinghouse pedigree, and demonstrated field performance such as PD location accuracy within 8–10 inches and documented cost/time savings of $20,000 and 5–6 weeks per case.

Name

Diagnostic Devices

Legal name

Diagnostic Devices Inc.

Website

https://diagnostic-devices.com

Company type

Private

Founded year

1992

Operating status

Operating

Headcount range

1–10 employees

Short description

Diagnostic Devices Inc. (DDI) is a privately held Simsbury, CT company that designs and sells proprietary fault-diagnostic systems based on partial discharge detection and electro-acoustic sensing, serving power utilities, transformer manufacturers, aviation, and cardiology providers across 25+ countries.

Ownership category

akta.pro rank

Product category

Electrical Power Transformer Diagnostics

NAICS

Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (33451)

SIC

Instruments For Meas & Testing Of Electricity & Elec Signals (3825), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Substation & HV Equipment Diagnostics (Partial Discharge, DGA, SF6) (EUAEAHAH)

akta.pro secondary industries

Non-Destructive Testing (NDT) & Diagnostics (IR/UV, PD, vibration, acoustic) (EUADAJAE), T&D project/program management & owner’s engineering (EPCM/PMC) (EUADAKAF)

Keywords

• Partial discharge diagnostics
• Transformer fault detection
• Non-invasive cardiac diagnostics
• Electro-acoustic sensing
• Electrical asset monitoring

Headquarters

HQ city

Simsbury

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Diagnostic Equipment Sales: Sale of proprietary diagnostic equipment including FDD-EPT, FAN-EPT, eCAD, DAM-AFS and other diagnostic systems. Products sold as hardware units with various configurations.
2. On-site Testing Services: On-site testing services provided to utilities and transformer manufacturers with complete test reports provided immediately at the site.
3. Test Equipment Leasing: Leasing of test equipment to customers with support for installation, data collection and analysis.
4. Annual Maintenance Contracts (AMC): Annual maintenance contracts offered to utilities and manufacturers for ongoing testing needs.
5. Design Services: Electrical Power Transformer design services ranging from 5 MVA to 500MVA (11KV to 525KV), both core and shell type.
6. Training Services: Expert training and instruction during installation, supplementing user manuals with 24/7 technical support available.

Pricing tiers

Go-to-market motion2 records

Distribution channels4 records

Marketing channels4 records

Core offering

DDI designs, manufactures, and sells proprietary diagnostic equipment for electrical power transformers (FD²-EPT and FAN-EPT for partial discharge detection) and non-invasive cardiac diagnostics (eCAD electro-acoustic device). The company complements hardware sales with on-site testing services, annual maintenance contracts, equipment leasing, transformer design services (5-500 MVA), and expert training, selling patented products across more than 25 countries to utilities, transformer manufacturers, and healthcare providers.

Product overview

Diagnostic Devices Inc. (DDI) is a privately held company offering a portfolio of specialized diagnostic products for electrical equipment and medical applications. The core product line includes FD²-EPT and FAN-EPT for partial discharge detection in electrical power transformers, both patented and commercialized products sold across 25+ countries. The company also offers eCAD, a non-invasive electro-acoustic cardiac diagnostic device in its 4th generation. Supporting products include DAM-AFS for aircraft structural integrity, FD²-EMG and FD²-SG/LTC for motors/generators and switchgear, FDD-BUSH for HV bushings, and GM-04 Graft Mapper for stem cell identification. DDI provides comprehensive services including on-site testing, consulting, test equipment leasing, transformer design services (5-500 MVA), and training. The company operates with a combined staff experience exceeding 150 years.

Differentiator

Problem solved

Functional benefit

Brands

• AngioScan: Non-invasive angiography device brand for coronary artery stenosis and heart failure diagnosis, incorporating AI-enhanced imaging technology.

Products and services

• FD²-EPT (Fault Diagnostic Device for Electrical Power Transformers) Patented partial discharge detection and location system for electrical power transformers, configured from 6 to 16 channels for on-site testing of transformers in service. Offered in lunch-box, rack-mount, panel mount, and briefcase configurations for utilities and transformer manufacturers.
• FAN-EPT (Fault Area Network for Electrical Power Transformers) On-line PD monitoring system for substation settings, capable of monitoring 3 to 9 transformers with remote operation via modem or other communication protocols in master-slave mode with cellular modem capability. For utility T&D operations.
• eCAD (AngioScan) - Electro-Acoustic Coronary Artery Disease Detection State-of-the-art non-invasive electro-acoustic sensing device that detects and locates cardio and coronary vascular disease with pinpoint accuracy. Uses proprietary signal processing algorithms with fast DSP core hardware. 4th generation system provides screening for assessing cardio and coronary conditions as an alternative to catheterization. For cardiologists and medical facilities.
• DAM-AFS (Damage Assessment System for Aircraft Fuselage) Non-destructive assessment system for airplane wing spars and aircraft fuselage structural integrity evaluation, detecting cracks and failures. For aircraft manufacturers and MRO organizations.
• FD²-EMG (Fault Diagnostic Device for Electrical Motors and Generators) Fault diagnostic device for electrical motors and generators. For industrial users of rotating electrical equipment.
• FD²-SG/LTC (Fault Diagnostic Device for Switchgear and Load Tap Changers) Fault diagnostic device for switchgear and load tap changers. For utility and industrial switchgear testing applications.
• FDD-BUSH (On-line Partial Discharge and Fault Monitoring System for HV Bushings) On-line partial discharge and fault monitoring system for high voltage bushings with digital read-out, easy operation, and economical design. For utility and industrial HV equipment monitoring.
• GM-04 Graft Mapper (Stem Cell Identification Device) Enables accurate identification of human embryonic stem cells as they differentiate for corrective action in engraftment procedures to treat diseases such as cancer, diabetes, and Parkinson's. For medical research and clinical applications.
• On-Site Testing Services Mobile on-site partial discharge testing services delivered to utilities and transformer manufacturers, including factory and field testing, with complete test reports provided immediately at the site. Includes ABB Vaasa 25 MVA 132 kV transformer certification and NeelTran Transformers 25 MVA rectifier testing.
• Electrical Power Transformer Design Services Electrical Power Transformer design services ranging from 5 MVA to 500 MVA (11 KV to 525 KV), both core and shell type. Drawing on staff with 75+ years of transformer design and manufacture experience from Westinghouse Canada and USA.
• Training and Consulting Services Expert training and instruction during installation, supplementing user manuals with 24/7 technical support available. Consulting services for failure diagnostic field related to electrical devices and medical applications.
• Test Equipment Leasing and Annual Maintenance Contracts Leasing of test equipment to customers with support for installation, data collection and analysis, plus Annual Maintenance Contracts (AMC) offered to utilities and manufacturers for ongoing testing needs.

Quantifiable outcome

• Reduced transformer maintenance costs through early PD detection
• +3 more outcomes

Named customers11 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability2 records

Feature5 records

Partnerships

Six partnerships are on record, tiered core.

• TARIL (Transformer India)coreOEM/ Whitelabel/ Licensing PartnerTARIL operates as OEM partner for DDI in India, representing transformer diagnostic products under the transformerindia.com brand.
• Shanghai Hongbang Technology Co. Ltd.coreChannel Partner/ Reseller/ DistributorExclusive Sales Representative for DDI in China. Located at 26F, Golden Bell Plaza, No. 98 Huaihai Road M., Shanghai 200021, China. Contact: Mr. Daniel Ren.
• Precision International CorporationcoreChannel Partner/ Reseller/ DistributorExclusive Sales Representative for DDI in Taiwan. Located at 7F, No. 82-8, Sec. 1, Kuang Fu Road, Sangchung City 241, Taipei, Taiwan. Contact: Mr. William Tsai, President.
• Tan Delta Electric CorporationcoreChannel Partner/ Reseller/ DistributorExclusive Sales Representative for DDI in the Philippines. Located at #34-A J. P. Rizal Street, Project 4, Quezon City, Philippines, 1109. Contact: Nestor P. Remigio, President.
• JRE Private LimitedcoreChannel Partner/ Reseller/ DistributorSales Representative for DDI non-medical products for Petrochemical Industry in India. Located at 35, Mistry Building, 635 JSS Road, Mumbai 400002, India. Contact: Vivek Mehta, Director.
• Pacific Test Equipment Pvt LtdcoreChannel Partner/ Reseller/ DistributorExclusive Sales Representative for DDI in Australia. Located at Unit 27, 7 Anella Ave., Castle Hill NSW 2154, Australia. Contact: Keith Bensley.

Scale indicators4 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• OMICRON electronics: Global leader in diagnostic testing for electrical power equipment, particularly partial discharge analysis on transformers and substations. Directly competes with DDI's FDD-EPT and FAN-EPT in the same utility and OEM customer base.
• Doble Engineering (ESCO Technologies): Established provider of diagnostic instruments, software, and services for transformer and electrical apparatus condition assessment. Competes head-to-head with DDI on PD detection and on-line monitoring for utility customers.
• EA Technology: UK-based specialist in partial discharge surveying, substation condition monitoring, and asset management services for utilities. Comparable peer given overlap with DDI's on-site testing services and FAN-EPT remote monitoring offering.
• Megger Group: Major manufacturer of electrical test and measurement instruments including transformer diagnostics, insulation testing, and on-line monitoring. Overlaps with DDI's portfolio of switchgear, bushing, and transformer test equipment.
• Bender Group: Provider of insulation monitoring, residual current monitoring, and PD detection systems for HV equipment including transformers and switchgear. Overlaps with DDI's FDD-BUSH and FD²-SG/LTC product lines for switchgear and bushing monitoring.
• Sefelec (Ametek): Specialist in electrical safety, dielectric, and partial discharge testing instrumentation for transformers, motors, and cables. Closely comparable peer to DDI's portfolio of FDD-EPT and FD² family products.
• IRIS Power (a Qualitrol company): Provider of on-line partial discharge and condition monitoring for motor and generator windings. Directly competes with DDI's FD²-EMG product family in large rotating machinery markets.
• Power Diagnostix Systems (PDIX): Specialist manufacturer of partial discharge measurement and analysis instruments for HV equipment. Closest niche competitor to DDI's FDD-EPT product family across both offline and on-line PD detection.

Others

• GE HealthCare: Broad medical imaging and diagnostics company with extensive cardiology portfolio including CT angiography and other non-invasive cardiac modalities. Relevant as a scaled reference point for DDI's non-invasive eCAD coronary artery disease detection technology.

Broad incumbents

• Fluke Corporation: Large established manufacturer of electrical test and measurement instruments covering industrial diagnostics. Competes in adjacent product categories to DDI but does not focus specifically on partial discharge for transformers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/DiagnosticDevicesInc
• LinkedInlinkedin.com/company/diagnostic-devices-inc

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 Diagnostic Devices