Sewerin AQUAPHON A 200 and SePem Loggers

Hermann Sewerin GmbH is based at Robert-Bosch-Strasse 3, Gütersloh, Germany, and supplies leak detection equipment for water and gas networks under the tagline Protecting Water, Gas and Life. Its quality management system meets DIN EN ISO 9001 and it is certified as an Authorised Economic Operator.

For water networks the range includes the AQUAPHON A 200 combination device for prelocation and pinpointing, SePem noise loggers for mobile and continuous monitoring, correlators, ground microphones and tracer gas. A talk at IFAT on 6 May 2026 presented the SePem 351 logger for continuous monitoring of drinking water networks.

• Piezo microphones: high-quality microphones with optimized frequency responses.
• GNSS positioning: GPS, Galileo and GLONASS to document leak locations.
• Automatic noise analysis: suggests suitable filters and shows frequency and sound intensity on a colour display.
• Audio player: compares leak noises on site, with a hearing protection function.
• Wireless components: moves between locations without cables, IP65/IP67 protection.
• SePem noise loggers: mobile (SePem 100 and 150) and continuous monitoring (SePem 351 and 352).

Leak pinpointing by field crews in provincial water companies after DMA night-flow alarms. Continuous noise logging on trunk mains and critical junctions. Training of new leak detection teams using the guided workflow of the AQUAPHON.

The wireless AQUAPHON A 200 allows free movement and fewer tripping hazards when changing locations. Built-in GNSS records leak positions in geographic context so leaks are found and repaired faster. Step-by-step user guidance and automatic filter suggestions help less experienced operators. The SePem 351 is positioned as a cost-effective way to monitor drinking water networks continuously.

Water companies combine continuous noise logging with portable pinpointing tools to cut water losses. Vietnamese utilities that have set up DMAs need tools for the next step of locating leaks inside each zone. Portable devices with GNSS logging help field crews document repairs.

Hermann Sewerin GmbH, Gütersloh, Germany, registered at Amtsgericht Gütersloh. Certified AEO and DIN EN ISO 9001. Founding year not stated on fetched pages; the site offers no Asian language version.