DCS Brings Its Award-Winning Heater Guard, the DIATRON OSU-400, to Interbad
By Arlene Scott
Senior Wellness Correspondent & Hospitality Consultant
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The GOLDEN WAVE 2026 winner scans a sauna heater at 100 points and cuts its power if a towel or bucket is left on top. DCS is showing its DIATRON controls at Interbad stand 1B64.
In this story3 sections
A towel left on the heater after cleaning. A wooden bucket set down in the wrong spot. The next time the sauna switches on, either one can start a fire. German controls maker DCS GmbH says its DIATRON OSU-400 module keeps the heater from ever getting hot when that happens, and the device is part of the company’s lineup at Interbad in Stuttgart this week.
SaunaNews touched base with DCS as Interbad opened on October 6. The company, based in Raubling, Bavaria, is exhibiting its DIATRON sauna control system at stand 1B64 through October 8. It says on its Interbad page that it will show its established modules “and some new developments.”
How it works
The OSU-400 mounts on the wall above the heater and scans the heater’s surface continuously with invisible light at 100 measurement points. It saves those readings as a 3D profile of the surface in its safe state, a little like a topographic map. When an object changes that profile, the module withdraws the heater’s electrical release, so the heater stays cold. Power comes back when the surface matches the learned profile again, or the system can be set to require a manual reset.
Key facts
- Product DIATRON OSU-400 heater monitoring and safety module
- Maker DCS GmbH (DIAMOND Control Systems), Raubling, Germany
- Coverage about 8 by 4 inches up to about 13 by 6.5 feet
- Response about 3 seconds, with an adjustable delay of 0 to 60 seconds
- Sensing invisible optical scanning, no camera or video
- Output alarm relay, NO or NC (60 V, 1 A)
- Requires DIATRON CPU-100 controller, connected through DIALINK
- Interbad 2026 stand 1B64, Oct. 6 to 8, Stuttgart
A red and green status light on the module shows whether it has tripped, so staff can see it at a glance. DCS argues that scanning the whole surface makes the system more reliable than mechanical sensors or single-beam light sensors, which watch only part of the heater. The company says the OSU-400 also responds to lightweight items.
The fine print for buyers
DCS positions the OSU-400 as the safety device required when a sauna heater can be switched on remotely, and says it goes “far beyond” the requirements of DIN EN 60335-2-53, the European safety standard for sauna heaters. DCS says the module can be retrofitted to existing heaters from any manufacturer. It gets its power and configuration from a DIATRON CPU-100 controller through the DIALINK interface, so the controller is part of the package.
Pricing and North American availability have not been announced.
Already a winner this year
In March, the OSU-400 took first place in the Smart Technology category of the GOLDEN WAVE 2026 innovation awards. SCHWIMMBAD+SAUNA magazine runs the awards, and the ceremony was held at Rulantica at Europa-Park. Hugo Lahme’s Smart Home Box placed second and Bleu Electrique’s CCEI Niva VP third.
Visitors can find DCS at stand 1B64. The company is offering free trade-show tickets with the code DIATRON at the Messe Stuttgart ticket shop.
This was the first story in SaunaNews’ Interbad 2026 coverage. Also from opening day: HUUM’s CORE Pro and KLINT heaters and the debut of the Estonian Sauna Trust. Exhibiting and have news to share? Write to hello@saunanews.com.
