Ultrasonic Heat Meter DELTA III DN20, 130 mm, qp 2.5 m³/h, M-Bus, MID

The DELTA III DN20 from Helvatron AG is designed for accurate heat metering in heating systems where a slightly higher flow capacity than DN15 is required. With 130 mm installation length and a nominal flow rate qp of 2.5 m³/h, this version is well suited for residential and light commercial applications.

Its integrated M-Bus readout interface enables efficient integration into remote metering and energy management environments. For centralized meter data acquisition and structured system monitoring, the DELTA III DN20 can be linked to the M-Center data logger.

Why choose the DELTA III DN20

Designed for stable heat metering

The ultrasonic flow sensor supports precise and repeatable measurement over long operating periods. This measuring principle is ideal for applications where long-term stability and low-maintenance operation matter.

Approved for billing applications

Because the DELTA III DN20 is MID compliant, it can be used for billing-related heat consumption measurement. The required MID verification fee is already included.

Easy integration into M-Bus systems

The built-in M-Bus communication interface makes this meter suitable for centralized reading concepts, building automation and submetering projects. In combination with the M-Center, consumption data can be collected and processed efficiently.

Practical advantages during installation

The DELTA III DN20 supports horizontal and vertical installation, giving installers more freedom in retrofit and new-build projects. The calculator is rotatable and removable, and a wall mounting adapter is supplied as standard.

Technical data DELTA III DN20

• Manufacturer: Helvatron AG
• Model series: DELTA III
• Nominal size: DN20
• Installation length: 130 mm
• Nominal flow qp: 2.5 m³/h
• Measurement principle: Ultrasonic
• Communication: M-Bus
• Factory cable length: 1.5 m
• Baud rate: 2400 (default)
• M-Bus secondary address: Serial number
• M-Bus primary address: 000
• Temperature sensor connection: Pt500
• Temperature sensor set: short direct immersion temperature sensors, 27.5 mm
• Temperature sensor cable length: approx. 1.5 m
• Power supply: Battery 19500 mAh
• Battery operated: Yes
• Operating pressure: 16 / 25 bar
• Material: Brass
• MID compliant: Yes
• Installation position: horizontal and vertical
• Data storage: all monthly values over the full service life

Main product features

• Ultrasonic flow measurement
• MID approved for billing
• M-Bus interface for remote reading
• Horizontal and vertical installation possible
• Very low installation height
• Rotatable and removable calculator
• Wall mounting adapter included
• Long-term storage of monthly values

Application areas

• Residential units and apartment buildings
• Heating systems with medium flow demand
• Consumption-based billing projects
• M-Bus remote reading systems
• Energy monitoring and building services
• Connection to the M-Center

FAQ for DELTA III DN20

Is the DELTA III DN20 suitable for billing purposes?

Yes, the unit is MID compliant and suitable for billing applications.

Which interface is available?

The heat meter includes an integrated M-Bus interface.

Can the meter be installed horizontally and vertically?

Yes, both installation positions are supported.

What type of temperature sensors are used?

It uses a Pt500 temperature sensor set with short direct immersion sensors.

Can the DELTA III DN20 be connected to centralized readout?

Yes, with its M-Bus interface it can be connected to remote reading systems and to the M-Center for central data acquisition.