Key Takeaways
- • DwyerOmega, backed by Arcline Investment Management, acquired SOR Controls Group, an 80-year-old manufacturer of pressure switches, temperature sensors, and level instruments serving refineries, chemical plants, and power stations; this marks DwyerOmega's tenth acquisition since Arcline's 2021 purchase of Dwyer Instruments and its third add-on in 2026.
- • SOR brings nuclear-qualified pressure switches (supplied to power plants since 1982), three operating brands, and a 110,000-square-foot manufacturing footprint in Kansas with additional production in Houston and sales offices in Beijing, Dubai, and Chennai to a portfolio now encompassing 21 brands across 50 locations in 18 countries.
- • The U.S. process instrumentation market reached $5.6 billion in 2025 and is projected to grow 3.0% annually to $7.4 billion by 2034; the global pressure-switch market alone is forecast to expand from $2.8 billion in 2025 to $3.5 billion by 2030, driven by replacement cycles in aging North American industrial infrastructure.
- • SOR, founded in 1946 by Roy Dunlap using $2,000 from Navy service benefits and remained family-owned for eight decades, operates three distinct brands: SOR Measurement Controls (switches and transmitters), SSi Temperature Sensors (thermocouples and thermowells), and SENSOR Sampling Systems (closed-loop sampling equipment for hydrocarbons and chemicals).
- • The acquisition reinforces Arcline's thesis on high-switching-cost industrial compounders with regulatory barriers and long product lives; Arcline closed its fourth fund in October 2025 with $6.0 billion in capital, up from $4.5 billion for Fund III, and has executed multiple transactions in 2026 including the AstroNova take-private and the Continental Aerospace Technologies acquisition.
Summary
Arcline Investment Management's portfolio company DwyerOmega has acquired SOR Controls Group, an 80-year-old manufacturer of industrial process instrumentation that has remained under family ownership since its 1946 founding. The transaction represents the tenth acquisition DwyerOmega has made since Arcline acquired Dwyer Instruments in July 2021, and marks the third add-on for the platform in 2026. SOR's product suite—pressure switches, temperature sensors, transmitters, and level instruments—complements DwyerOmega's existing portfolio, which has grown to encompass 21 brands operating across 50 locations in 18 countries with more than 3,000 employees.
SOR operates through three specialized brands serving distinct market segments. SOR Measurement Controls manufactures pressure switches and transmitters, including nuclear-qualified variants supplied to power plants continuously since 1982—a critical differentiator in safety-critical applications. SSi Temperature Sensors produces thermocouples, resistance temperature detectors, and thermowells for process line monitoring. SENSOR Sampling Systems, formed in 2016, manufactures closed-loop sampling equipment allowing operators to extract hydrocarbon or chemical samples without environmental release. The company's 110,000-square-foot manufacturing plant in Lenexa, Kansas, combined with Houston production facilities and international sales offices in Beijing, Dubai, and Chennai, positions the combined entity to serve global customers including chemical producers, oil and gas companies, power generators, water utilities, and equipment manufacturers.
The industrial process instrumentation market presents substantial growth potential. The U.S. market was valued at $5.6 billion in 2025 and is projected to reach $7.4 billion by 2034 at a 3.0% compound annual growth rate, according to Renub Research. Globally, Mordor Intelligence sizes the market at $19.7 billion in 2026, with North America representing approximately 45% of revenue. The pressure-switch segment specifically is forecast to grow from $2.8 billion in 2025 to $3.5 billion by 2030, driven partly by replacement cycles in aging North American industrial plants. SOR competes against established players including Emerson-owned Rosemount, family-controlled Endress+Hauser, German-based WIKA, AMETEK-owned Magnetrol, and United Electric Controls.
Arcline's acquisition strategy reflects its focus on industrial compounders characterized by high customer switching costs, regulatory barriers, and long product lifecycles. The firm has accelerated consolidation activity, having closed Arcline Capital Partners IV LP in October 2025 with $6.0 billion in capital, up from $4.5 billion for Fund III in 2023. Recent platform transactions include the August 2026 AstroNova take-private and the June 2026 acquisition of Continental Aerospace Technologies from AVIC for approximately $535 million. DwyerOmega's integration strategy under CEO Chuck Dubois emphasizes combining complementary product portfolios to expand measurement technology offerings globally, while SOR's Chairman Alaya Belmonte noted the acquisition strengthens the company's ability to expand offerings while preserving its eight-decade operational philosophy centered on quality and customer focus. EC M&A served as financial advisor to Arcline on the transaction.
SOR operates through three specialized brands serving distinct market segments. SOR Measurement Controls manufactures pressure switches and transmitters, including nuclear-qualified variants supplied to power plants continuously since 1982—a critical differentiator in safety-critical applications. SSi Temperature Sensors produces thermocouples, resistance temperature detectors, and thermowells for process line monitoring. SENSOR Sampling Systems, formed in 2016, manufactures closed-loop sampling equipment allowing operators to extract hydrocarbon or chemical samples without environmental release. The company's 110,000-square-foot manufacturing plant in Lenexa, Kansas, combined with Houston production facilities and international sales offices in Beijing, Dubai, and Chennai, positions the combined entity to serve global customers including chemical producers, oil and gas companies, power generators, water utilities, and equipment manufacturers.
The industrial process instrumentation market presents substantial growth potential. The U.S. market was valued at $5.6 billion in 2025 and is projected to reach $7.4 billion by 2034 at a 3.0% compound annual growth rate, according to Renub Research. Globally, Mordor Intelligence sizes the market at $19.7 billion in 2026, with North America representing approximately 45% of revenue. The pressure-switch segment specifically is forecast to grow from $2.8 billion in 2025 to $3.5 billion by 2030, driven partly by replacement cycles in aging North American industrial plants. SOR competes against established players including Emerson-owned Rosemount, family-controlled Endress+Hauser, German-based WIKA, AMETEK-owned Magnetrol, and United Electric Controls.
Arcline's acquisition strategy reflects its focus on industrial compounders characterized by high customer switching costs, regulatory barriers, and long product lifecycles. The firm has accelerated consolidation activity, having closed Arcline Capital Partners IV LP in October 2025 with $6.0 billion in capital, up from $4.5 billion for Fund III in 2023. Recent platform transactions include the August 2026 AstroNova take-private and the June 2026 acquisition of Continental Aerospace Technologies from AVIC for approximately $535 million. DwyerOmega's integration strategy under CEO Chuck Dubois emphasizes combining complementary product portfolios to expand measurement technology offerings globally, while SOR's Chairman Alaya Belmonte noted the acquisition strengthens the company's ability to expand offerings while preserving its eight-decade operational philosophy centered on quality and customer focus. EC M&A served as financial advisor to Arcline on the transaction.
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