What Hermann Sewerin GmbH does

Hermann Sewerin GmbH is a privately held, family-owned German manufacturer of specialized measurement and detection equipment for gas, water, and underground infrastructure, headquartered in Gütersloh and operating continuously for over 100 years. The company organizes its portfolio into four product verticals: water leak detection (noise loggers such as the SePem 351, ground microphones, correlators including SeCorr C 200 and SeCorrPhon AC 200, and tracer gas devices); gas detection, measurement, and warning devices (TDLAS laser detectors like the SR-LD 200 and SR-LD 800, vehicle-mounted LaserGasPatroller systems, portable gas sniffers, and combination instruments such as the VARIOTEC series); bio and process gas monitoring (stationary BioControl 2/4/8 systems and mobile Multitec analyzers for biogas, landfill, and sewer gas); and pipe/object detection (UT, FERROPHON, and FerroTec locators and magnetometers). Underlying technologies include tunable diode laser absorption spectroscopy, acoustic correlation with GNSS positioning, portable gas chromatography for ethane/methane discrimination, LoRaWAN-connected noise logging, and ATEX-certified explosion-protected instrumentation.

The company monetizes primarily through hardware sales, supplemented by one-time software licenses with annual maintenance fees for its SeCuRi SAT, WaterCom, and GasCom documentation platforms, plus professional services spanning calibration, repair, vehicle customization, and training. Distribution combines wholly-owned subsidiaries in France (Sewerin S.à.r.l.) and the UK (Sewerin Ltd) with a global certified partner network and direct enterprise sales via regional websites serving Germany, the UK, France, Spain, Portugal, Poland, Austria, and the USA/Canada. Customers include systemically important gas and water utilities, municipal water operators, biogas plant operators, fire services, and the German armed forces. Pricing is quote-based and not publicly disclosed. The company holds Authorised Economic Operator (AEO) and DIN EN ISO 9001 certifications and reports 21% European market share in the global combustible gas detection alarm market.

Name

Hermann Sewerin GmbH

Legal name

Hermann Sewerin GmbH

Website

https://sewerin.com

Company type

Private

Founded year

1908

Operating status

Operating

Headcount range

51–100 employees

Short description

Hermann Sewerin GmbH is a German family-owned manufacturer of specialized detection and measurement equipment for gas utilities, water suppliers, and biogas operators, selling hardware, integrated compliance software, and services across Europe and North America.

Ownership category

akta.pro rank

Product category

Leak Detection Equipment

NAICS

Totalizing Fluid Meter and Counting Device Manufacturing (334514), Water, Sewage and Other Systems (2213), Pipeline Transportation of Natural Gas (48621)

SIC

Water Supply (4941), Electric, Gas & Sanitary Services (4900), Natural Gas Transmisison & Distribution (4923), Laboratory Analytical Instruments (3826), Instruments For Meas & Testing Of Electricity & Elec Signals (3825)

akta.pro primary industry

Active Leak Detection & Acoustic Surveying (Ground Mics, Correlators, Hydrophones) (EUANAKAA)

akta.pro secondary industries

Advanced Leak Quantification & Emissions Measurement (Methane Quantification/OGI/Flux) (EUAJADAK), Fixed Gas Detection & Continuous Monitoring (Sensors/IoT/Telemetry) (EUAJADAB), Real-Time Leak Alarms & Event Management (Analytics Platforms, Workflows) (EUANAKAK), Sewer Line Locating & Depth Verification (HSAOABAK)

Keywords

• Water leak detection equipment
• Gas detection instruments
• Biogas monitoring systems
• Pipe location devices
• Methane detection technology

Headquarters

HQ city

Gütersloh

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Hardware Sales - Gas Detection Devices: Sale of portable and vehicle-mounted gas detection, measurement, and warning devices including laser-based detectors (SR-LD series), gas sniffers (EX-TEC SNOOPER), and combined instruments (EX-TEC PM series, VARIOTEC series).
2. Hardware Sales - Water Leak Detection Equipment: Sale of acoustic leak detection systems including correlators (SeCorr C 200), ground microphones (AQUAPHON series, Stethophon 04), noise loggers (SePem series), and tracer gas systems (VARIOTEC 460 Tracergas).
3. Hardware Sales - Pipe Location and Detection: Sale of pipe location devices (UT series), object detection magnetometers (FerroTec FT 10), and combination systems for underground infrastructure inspection.
4. Hardware Sales - Bio/Process Gas Monitoring: Stationary gas monitoring systems (BioControl 2/4/8) and mobile multi-gas measuring devices (Multitec series) for biogas plant process optimization.
5. Professional Services: Central and mobile maintenance services, repairs, inspections of gas and water networks, vehicle development and customization, building services, and training seminars.
6. Software Licenses: One-time software licenses with annual maintenance costs for SeCuRi SAT, WaterCom, and GasCom documentation software.

Pricing tiers

Go-to-market motion1 record

Distribution channels5 records

Marketing channels7 records

Core offering

Hermann Sewerin GmbH manufactures and sells specialized measurement and detection equipment for gas, water, and biogas infrastructure. The portfolio spans portable and vehicle-mounted laser-based gas detectors, acoustic water leak detection systems (correlators, noise loggers, ground microphones), multi-gas analyzers for biogas plants, and pipe/object location devices, complemented by SeCuRi SAT, WaterCom, and GasCom software for regulatory compliance documentation and an EU Methane Regulation LDAR reporting.

Product overview

Hermann Sewerin GmbH offers a comprehensive portfolio of specialized measurement and detection equipment organized into four main product categories: Water (leak detection via acoustic methods, correlators, noise loggers, ground microphones, and tracer gas), Gas (detection, measurement, and warning devices including laser-based systems, vehicle-mounted patrol systems, and multi-gas analyzers), Bio & Process Gas (stationary and mobile biogas monitoring systems), and Detection/Location (pipe and object detection equipment). The product range includes both portable handheld devices and stationary systems, with notable specialized offerings such as the LaserGasPatroller vehicle-based gas detection system, the SeCorrPhon AC 200 water leak correlation system, and the VARIOTEC 660 for hydrogen-compatible gas measurement. The portfolio is designed for utility companies, network operators, municipal services, and specialized contractors in gas and water supply industries.

Differentiator

Problem solved

Functional benefit

Brands

• SeCuRi SAT: Software platform linking measurement devices to pipe sections and generating LDAR reports for EU Methane Regulation compliance.
• WaterCom
• GasCom
• SeCuRi

Products and services

• SePem 351 Stationary noise logger for continuous monitoring of drinking water networks, featuring LoRaWAN data transmission for cost-efficient network surveillance.
• SePem 150 Mobile noise logger for medium-term monitoring of water network sections.
• SePem 100 Mobile noise logger for short-term monitoring of water network sections.
• SeCorr C 200 High-performance correlator using acoustic correlation technology for fast water leak detection.
• SeCorrPhon AC 200 Water leak detection system combining test rod, ground microphone and correlator in one device with integrated GNSS module for precise position documentation.
• AQUAPHON A 200 Comprehensive acoustic leak detection system for water pipe networks, providing maximum support for professional leak detection operations.
• AQUAPHON A 150 Acoustic precision device for leak detection in water pipe networks.
• AQUAPHON A 50 Compact entry-level acoustic water leak detector with piezo microphone technology, offering up to one week battery life for pre-location and pinpointing leaks on various surfaces.
• Stethophon 04 Compact receiver for indoor water leak detection with undistorted sound reproduction, digital minimum level display, and customizable filter function, available in wired or wireless SDR versions.
• VARIOTEC 460 Tracergas Portable water leak detector using 95% nitrogen/5% hydrogen tracer gas and thermal conductivity sensor measuring up to 100 vol.% H2 for detecting smallest leaks in noiseless and unpressurized areas.
• SR-LD 200 Compact mobile laser gas detection device using TDLAS technology for remote methane detection up to 394 ft, with 5 ppm*m laser resolution and up to 13 hours battery life.
• SR-LD 800 Long-range TDLAS laser gas detection device capable of detecting methane leaks from up to 656 ft away.
• LaserGasPatroller LGP 800 Vehicle-mounted TDLAS laser detection system for efficient underground gas pipeline inspection while driving, detecting methane emissions with automatic LDAR report generation and SeCuRi SAT software integration.
• LaserGasPatroller LGP 900 State-of-the-art vehicle-based laser leak detection system for efficient pipe network inspection with automated LDAR reporting.
• PORTAFID M3-K Professional gas detection device for precise and efficient checking of underground gas pipes.
• SNOOPER mini Easy-to-use gas leak detector for quick detection of gas leaks.
• EX-TEC SNOOPER 4 Portable gas leak detector for fast detection of methane, propane, butane, hexane, nonane, hydrogen and JFUEL with integrated gas database for calibration to seven gases.
• EX-TEC PM 400 Versatile ATEX explosion-proof gas warning device with flexible sensor configuration for up to four gases (CH4, H2S, O2, CO, CO2), IP65 protection, and up to 11 hours battery life.
• EX-TEC PM 580 Gas combination device designed for emergency services, detecting, warning and measuring with a single device.
• EX-TEC HS 680 Universal gas measuring device for all applications with integrated SeCuRi SAT software for documentation and reporting.
• VARIOTEC 660 Combined gas measuring instrument for professional pipeline inspection in natural gas and hydrogen networks, featuring simultaneous methane and hydrogen measurement, ATEX explosion protection, and optional ethane analysis for natural gas/swamp gas differentiation.
• VARIOTEC 480 EX Economical gas combination device for reliable gas detection.
• VARIOTEC 460 EX Gas combination device for reliable monitoring of pipe networks.
• VARIOTEC 450 EX Gas combination device for efficient measurement and safe work.
• VARIOTEC 400 EX Reliable and mobile gas detection device.
• VARIOTEC EGA Portable ethane gas analyzer using integrated gas chromatograph and semiconductor sensor for methane, ethane, and propane detection in ppm range to differentiate natural gas from swamp gas.
• Multitec 560 Mobile multi-gas analyzer for process gases with comprehensive gas analysis capabilities for protecting field teams.
• Multitec 540 Precise multi-gas measurement device for biogas, sewer gas and landfill gas analysis.
• Multitec 545 Multi-gas warning device with extended H2S measuring range for biogas applications.
• BioControl 2 Stationary gas monitoring system for up to two measurement locations in biogas plants, measuring methane and carbon dioxide with optional O2, CO, H2, H2S sensors.
• BioControl 4 Stationary gas monitoring system for up to four measurement locations with integrated flow and temperature measurement for biogas production optimization.
• BioControl 8 Comprehensive stationary gas monitoring system for up to eight measurement locations in biogas plants.
• UT 930 Compact entry-level pipe location system with UT 930 R receiver and UT 935 TX generator, featuring seven frequencies, auto-gain mode, and up to 100 hours battery life.
• UT 9100 Pipe location system with bi-directional communication for efficient working.
• UT 9200 Pipe location device with maximum accuracy and integrated GNSS documentation.
• FERROPHON FG 150 Pipe location device for efficient detection of metallic pipes.
• FERROPHON FG 150 C Pipe location device for reliable detection of both metal and plastic pipes.
• AQUAPHON AF 50/FERROPHON FG 50 Precise indoor positioning device for installation professionals.
• COMBIPHON CG 155 Precise location device for non-metallic pipes.
• Glass fibre probe system Precise location system for non-metallic pipes in gas, water, and wastewater networks using glass fiber probe technology.
• FerroTec FT 10 Compact magnetometer for quick and reliable location of ferromagnetic objects up to 15m depth with six sensitivity levels, IP65 rating, and ability to identify live cables.
• SeCuRi SAT software Software platform that links measurement devices to pipe sections, generates LDAR reports for EU Methane Regulation compliance, and provides customers with data sovereignty.
• Service and Repair Center Central and mobile maintenance services, repairs, inspections of gas and water networks, vehicle development and customization, building services, and training seminars for customers using Sewerin measurement and detection equipment.

Quantifiable outcome

• Methane detection sensitivity of 0.1 ppm with 2.5 metre accuracy (LGP 800)
• +3 more outcomes

Named customers6 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

Feature7 records

Partnerships

Two partnerships are on record, tiered core.

• Certified Vehicle Installation PartnerscoreImplementation/ SI/ Consulting PartnerCertified contract partners providing professional installation services for vehicle-based detection systems (LaserGasPatroller LGP 800/900). Installation available in wide variety of vehicle types including electric vehicles due to low power consumption requirements.
• Distribution and Service PartnerscoreChannel Partner/ Reseller/ DistributorGlobal network of certified distribution and service partners handling local sales, product installation, maintenance, and repair services. Partners listed regionally through company website contact pages.

Scale indicators4 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Itron: Provider of smart metering, network monitoring, and data analytics solutions for water and gas utilities. Adjacent to Sewerin's leak detection and monitoring products through its AMI/network communication infrastructure.
• Xylem: Global water technology company with leak detection, smart metering, and pipe condition assessment solutions for utilities. Overlaps with Sewerin's water leak detection portfolio as a much larger incumbent with broader water offerings.
• MSA Safety: Global safety equipment manufacturer offering fixed and portable gas detection, flame detection, and respiratory protection. Competes with Sewerin in utility and emergency services gas detection markets.
• Halma plc: FTSE-listed group of safety, environmental, and sensor technology companies including water leak detection and gas detection subsidiaries. A natural peer comparison for Sewerin's niche measurement and detection business model.
• Honeywell Analytics: Division of Honeywell offering a broad portfolio of fixed and portable gas detection, flame detection, and gas analysis for industrial and utility markets. Competes across multiple Sewerin categories as a global incumbent with larger R&D and distribution.

Emerging players

• Badger Meter: US-based manufacturer of flow measurement and smart water metering solutions for utilities. Adjacent overlap with Sewerin's water network measurement and monitoring focus, though primarily metering-centric rather than leak detection-centric.

Direct peers

• Gutermann: Specialist in water leak detection technology including acoustic correlators, noise loggers, and ground microphones. Directly competes with Sewerin's AQUAPHON, SeCorr, and SePem product lines for municipal water utility customers.
• Industrial Scientific: Global gas detection company specializing in portable gas monitors, area monitoring, and connected safety solutions for confined space and industrial applications. Overlaps with Sewerin's EX-TEC warning and combination devices.
• RKI Instruments: Japanese gas detection manufacturer with a strong portfolio of portable and fixed gas detectors for combustible gases, H2S, CO, and O2. Competes with Sewerin's gas detection devices in industrial safety and utility markets.
• Drägerwerk: German-headquartered global safety and gas detection specialist with deep overlap in portable and stationary gas measurement devices for utilities, emergency services, and industrial customers. Directly competes with Sewerin across EX-TEC and VARIOTEC product categories.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/user/SewerinGmbH
• Facebookfacebook.com/seweringmbh
• LinkedInlinkedin.com/company/hermann-sewerin-gmbh
• Xx.com/sewerinnews

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries2 records

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 Hermann Sewerin GmbH