CEM CM-HR DN20 Ultrasonic Heat Meter
CEM CM-HR DN20 Ultrasonic Heat Meter
- CEM CM-HR ultrasonic heat meter
- Body size DN20 (¾”), nominal flow rate Qn 2.5 m³/h
- Body length (L) 130 mm, 1” threaded connection (G1B)
- Communication: Wired M-Bus and optical interface (wM-Bus/LoRaWAN, NB-IoT and pulse modules optional)
- Application: heating and cooling; installation point: return line
- Temperature sensor: JUMO PT1000, with 1.5 m cable
- MID approval: Germany, accuracy class 2
- Pressure rating: PN16
CEM CM-HR Series
The CEM CM-HR series is an ultrasonic heat meter designed for homes and offices; it is available in heating, cooling and heating + cooling versions.
The meter consists of a calculator unit, an ultrasonic flow sensor and a calibrated PT1000 temperature sensor pair. It is installed in the return line and can be mounted horizontally, vertically or in other orientations.
Key Features (manufacturer data)
- MID approved (PTB), accuracy class 2 (EN 1434)
- Wired M-Bus and optical interface as standard
- Optional communication modules: wM-Bus / LoRaWAN, NB-IoT, pulse
- Medium temperature 4–95 °C (optional 4–130 °C); pressure rating PN16
- Protection class IP67
- 3.6 V lithium battery, 10 years
Applications
- Heat consumption metering for apartments and dwelling units
- Centrally heated apartment buildings and residential complexes
- Heat cost allocation and billing
- Offices and small commercial units
Why CEM CM-HR?
In addition to standard M-Bus, the CM-HR can be switched to wM-Bus, LoRaWAN or NB-IoT by changing the module, so it adapts to different reading infrastructures; its IP67 housing is an advantage in damp shafts and manifold cabinets.
Installation, Reading and Re-verification
Install the meter in the position and at the mounting point specified in its manual; a strainer upstream of the meter and an isolating valve before and after it (for easy replacement) are recommended. In Türkiye, Novus Energy also provides remote meter reading and heat cost allocation services after installation. Periodic re-verification requirements for heat meters depend on local regulations; see our re-verification and calibration page for details.
Other models in the same size: DN20 heat meters · All products of the brand: CEM · What is a heat meter and how do you choose one?
| Body Size (DN) | : | DN20 (¾”) |
| Application | : | Heating, Cooling |
| Nominal Flow Rate (Qn) | : | 2.50 m³/h |
| Connection Size | : | 1″ Threaded |
| Communication | : | M-Bus (Wired) |
| Body Length (L) | : | 130 mm |
| MID Approval | : | Germany |
| Country of Origin | : | Türkiye |
| Temperature Sensor | : | JUMO PT1000 |