Woltmann helix energy meter certified in compliance with MID 2014/32/EU directive, composed of a multi-jet volumetric flow meter with magnetic transmission, electronic unit, and temperature probes.

Technical data of flow meter
- Nominal flow rate: 15 m3/h (model DN50), 25 m³/h (model DN60), 40 m3/h (model DN80), 60 m3/h (model DN100), 100 m3/h (model DN125), 150 m3/h (model DN150)
- Maximum flow rate: 30  m3/h (model DN50), 50 m3/h (model DN60), 80 m3/h (model DN80), 120 m3/h (model DN100), 200 m3/h (model DN125), 300 m3/h (model DN150)
- Maximum operating temperature: 130 °C

Technical data of EVO electronic unit
- Temperature range: 5÷55 °C
- Temperature difference in heating: 3÷100 K
- Temperature difference in cooling: -3÷-50 K
- Storage temperature: 0÷55 °C
- Measuring frequency: ever 30 seconds (every 2 seconds with 230 Vac power pack for EVO energy meter, optional)
- Pulses: 100 litres/pulse for sizes from DN50 to DN125, 1000 litres/pulse for size DN150
- Display: LCD 8 digit + special characters
- Unit of measure of energy: MWh
- Power supply: 3.6 V lithium battery with maximum estimated (not guaranteed) duration of 6 years (the battery life depends on the conditions of installation and use). The battery is guaranteed for 2 years from the date of purchase
- The battery is replaceable on these models
- Data storage: EE-PROM / daily
- Reading date: settable
- Protection rating: IP54

Temperature sensors:
- Diameter: 6 mm
- Cable length: 3 m
- Dimensions (Length x Width x Height): 150 x 130 x 35 mm

To be able to connect up to 3 domestic water meters with pulse output to the EVO electronic unit, install the optional module with 3 pulse inputs for EVO meter.
Communication via M-Bus protocol as per UNI EN 1434-3 standard.

Use the “USB optical head kit” to set the primary address of the meter.