Helvatron AG · Baar, Switzerland
Ultrasonic water meters and heat meters From the first sketch to the calibrated meter
Helvatron develops and manufactures the H2O water meter and the DELTA III heat and cooling meter in Baar, Switzerland. Both measure with ultrasound and connect to building automation and energy management via M-Bus, RS-485 (Modbus RTU), LoRa or NB-IoT.
- Water meter
- DN15–DN600
- Helvatron H2O ultrasonic water meter
- Heat and cooling meter
- DN15–DN1000
- Helvatron DELTA III ultrasonic heat meter
- Approval
- MID
- PTB type examination, module D by METAS-Cert
- Capacity
- 350,000
- meters per year, new line 2026
Manufacturer, not reseller
What does ‘made in Switzerland’ mean at Helvatron?
Development, production and an accredited test field are under one roof in Baar, alongside sales, service and support. Production of the H2O and DELTA III is certified to MID module D, audited by METAS-Cert. In our own laboratory we test for UV exposure, temperature and humidity, IP68, EMC and radio, among other things.
- Our own ultrasonic measurement technology for water and for heating and cooling energy
- Certified to ISO 9001, ISO 14001 and ISO 50001
- New production line in 2026 with a capacity of around 350,000 meters per year
Products
Two product families, every pipe size from a single supplier
Threaded up to DN40, flanged from DN50. Both meters work on the same principle: ultrasound instead of moving parts, data stored in the meter and the interface of your choice.
Helvatron H2O
Ultrasonic water meter for cold and hot water, for billing and energy management. MID, WRAS, OIML R 49, IP68.
Helvatron DELTA III
Ultrasonic heat and cooling meter (BTU meter) with separate registers for heating and cooling. The battery, sensors and communication card can be replaced on site.
H2O in use
From installation in the pipe to the reading in the control system
The animation shows an H2O in the cold-water pipe of a plant room: installation, ultrasonic measurement, flow rate and the data path via M-Bus to the building management system.
- Prepare the pipeThe meter is fitted in the cold-water pipe between two shut-off valves. From DN15 to DN40, the H2O needs no straight inlet or outlet sections.
- Install the meterDN15 to DN40 with threaded connections, from DN50 with flanges. The arrow on the meter shows the flow direction; any installation position is permitted.
- Water flowsWater flows through the measuring tube of the meter to the distribution pipework in the building.
- Measure with ultrasoundTwo transducers alternately send pulses with and against the flow. The pulse travelling with the flow arrives sooner.
- Calculate flow rateThe transit time difference gives the flow velocity and hence the flow rate. The meter totalises the volume and stores hourly, daily and monthly values.
- Transmit dataAn M-Bus master such as the EMU M-Center reads the meter by its secondary address. Other versions transmit via RS-485 (Modbus RTU) or LoRa.
- Analyse in the control systemThe M-Center forwards the values via MQTT, BACnet IP, Modbus TCP or CSV to the building management and energy management systems.
DELTA III in use
How a heat meter measures energy in a heating circuit
The heat transferred is calculated from the flow rate and the flow and return temperatures. In cooling mode, the DELTA III records cooling energy in a separate register.
- Heating circuitThe flow pipe carries warm water to the consumer and the return pipe brings the cooled water back. The pump keeps the water circulating.
- Install the DELTA IIIThe flow sensor is installed in the pipe, with the calculator next to it on a DIN rail or wall. One temperature sensor is fitted in the sensor body.
- Two temperaturesThe second sensor measures in the other pipe. Pt500 or Pt1000, two-wire connection. The installation instructions specify which pipe is which.
- Flow by ultrasoundInside the sensor, ultrasonic pulses travel via metallic reflectors with and against the flow. From this, the calculator determines the volume flow rate.
- Temperature differenceThe calculator continuously determines the difference between flow and return temperature.
- Calculate energyVolume times temperature difference times heat coefficient gives the energy. Heating and cooling go into separate registers.
- Send valuesThe communication card passes the values on, here via RS-485 with Modbus RTU. The card can be replaced on site.
- In the higher-level systemThe building automation or energy management system displays power, energy and temperatures and handles billing.
Communication
Which interface suits your building?
Wired where a bus already exists or can be installed, radio where meters are spread out and hard to reach. You select the interface via the part number; on the DELTA III it sits on a replaceable communication card.
Also available, depending on the product: wireless M-Bus, 4–20 mA (DELTA III, flow rate) and an optical interface for on-site configuration and reading.
Applications
Where Helvatron meters measure
Residential and commercial buildings
Water and heat metered per unit and billed on actual consumption, read via M-Bus or LoRa.
Boiler rooms and plant rooms
DELTA III on heat generators, substations and heating circuits, connected to the building automation system via Modbus RTU.
District cooling and office towers
Cooling meters in large flanged sizes, used for many years in air-conditioning plants in the Middle East.
Service connections and water distribution
H2O rated IP68, also for pits and meter boxes, with reverse-flow measurement and leak detection.
Industry and ISO 50001
Measure water, heating and cooling flows for each plant and analyse them in the energy management system.
Data centres, hospitals, airports
Chilled-water distribution and water consumption, where downtime is costly and data must be complete.
Digital integration
From the meter to the analysis
For data acquisition and energy management, Helvatron uses two products from its sister company EMU Electronic AG: the EMU M-Center data logger and the Joulio-Web software.
International
Helvatron companies in Europe and the Middle East
Our meters are manufactured in Switzerland and the Smart Valve in Gotha, with warehouses, sales and service close to the projects.
Helvatron AG, Baar
Development, production, test field, sales and service
Helvatron GmbH, Gotha
Smart Valve production, sales and warehouse for the EU
Helvatron Measuring & Control Systems LLC, Dubai
Sales, service and billing services, own warehouse
Helvatron d.o.o., Sarajevo
Sales and customer service, own warehouse
Helvatron Consulting, Riyadh
Pre-sales and after-sales support
Quality and evidence
Approvals and certifications
DE-23-MI004-PTB0076030-03039What can we measure for you?
We provide consultants, installers, system integrators and distributors with data sheets, sizing support and quotations. Tell us the pipe size, medium and interface, or simply what you are planning.