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Large size flow meter for commercial applications

Sono 3500 CT™ is an ultrasonic flow sensor designed for heating, cooling, or combined heat/cool applications in larger-sized local and district energy systems. Combined with a type-approved heating/cooling energy calculator (e.g. InfoCal™ 9) it offers energy metering capabilities in larger applications.
The sensor is MID Class II certified.

Technical data

  • Size | Flow: DN100 – DN1200 | Qp 60 - 9000 m3/h
  • Temperature | Pressure: Compact: 2-120°C / Remote: 2-200°C | PN16/25/40
  • Types: Flow meter (heat, cool and combined). Compact or remote version
  • Approvals: MID class II B+D (heating)
  • Flow sensor cable length: 5.0m | 10.0m | 20.0m | 30.0m
  • Flow measurement: Bi-directional
  • Protection class: IP65
  • Communication: 2 Pulse outputs
  • Optical interface: IRDA with Modbus RTU protocol
  • Power:
    • 115 / 230 V AC with 3.6V single backup battery
    • 3.6V battery with dual 3.6V
      backup battery

Features and benefits

For high and very high temperatures applications

Remote version for very high temperature
applications enhances the meter lifetime
and lowers replacement costs

No pressure loss reduces pump power
and energy used for circulation


Type Name Language Valid for Updated Download File type
Brochure eBook | Danfoss Digital Hydronics™ English Multiple 15 Feb, 2022 5.5 MB .pdf
Brochure Energy metering solutions - Product overview English Multiple 20 Sep, 2022 7.1 MB .pdf
Quality Assurance Certificate FORCE DK-0200-MID-00446.Rev. 6 English Multiple 18 Sep, 2023 214.0 KB .pdf
Brochure Precision and reliability through advanced ultrasonic technology 4-pager English Multiple 12 Apr, 2019 560.5 KB .pdf
Data sheet SONO 3500 CT English Multiple 30 Apr, 2021 1.4 MB .pdf
Tender text SONO 3500CT English United Kingdom 09 Jun, 2019 226.2 KB .pdf
Operating guide Ultrasonic Flowmeter SONO 3500 CT English Multiple 25 Nov, 2020 3.8 MB .pdf