MTWD
The ZENNER MTWD is a multi-jet water meter designed to measure hot water in buildings, both domestic hot water and heating return lines. An operating temperature up to 90 °C, R80 horizontal / R40 vertical accuracy class and an IP68 hermetic glass/copper register give it a long service life. An M-Bus module connects it directly to Argus EMS.
| Diameter (DN) | DN15, DN20, DN25, DN32, DN40 |
| Max. Temperature | 90 °C |
| Accuracy | R80 (horizontal) / R40 (vertical) |
| Max. Operating Pressure | PN 16 (16 bar) |
| Protection Class | IP68 (hermetic register) |
| Protocol | M-Bus EN 13757-2/-3 |
| Connection | Via an M-Bus TCP gateway (Argus EMS compatible) |
| Battery | ≥ 12 years |
| Registers | Hermetic glass/copper — fog-free |
| Mounting | Horizontal / vertical / inclined |
| Standards | EN 14154, MID 2014/32/EU Annex MI-001 |
Integration with Argus EMS
The MTWD connects to Argus EMS over M-Bus (EN 13757) two-wire meter loop, and because a ready register template ships with the platform you do not have to work out a point map on site. The field agent polls the device every 60 seconds by default, writes the reading into a local queue first and then forwards it to the server over MQTT/TLS; nothing is deleted before the server acknowledges it. Hourly and daily summaries are derived from these raw readings, and the consumption and cost screens are fed from the same series.
| Protocol | M-Bus (EN 13757) two-wire meter loop |
| Connection path | The M-Bus loop is read through an M-Bus TCP gateway |
| Default polling period | 60 seconds (field agent) |
| Points in the ready template | 8 registers |
| Consumption calculation | Difference of the m³ index over the period |
| Data assurance | Local queue plus server acknowledgement; nothing is deleted before it is confirmed |
When Is This Model the Right Choice?
It is used to meter water consumption per flat, tenant or zone; the index is read remotely, so the monthly manual reading round is no longer needed. The same measurement forms the basis both for billing and for hunting leaks through night-flow analysis.
The M-Bus loop is two-wire and meters connect in parallel on the same pair, so no dedicated cable is pulled per meter. Loop length, conductor cross-section and the number of meters on the loop are assessed together, because an M-Bus gateway can only drive a limited load. Meter addresses (primary/secondary) are verified one by one during commissioning.