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Proxima 2.4 GHz Wireless Mesh
Wireless mesh sensors for buildings without new cabling: base station, transmitters and input module.
Proxima mesh is Produal's 2.4 GHz wireless network for building automation, where each device joins the mesh and sends its readings to a base station. This page covers the WBU base station, the battery-powered WTR and mains-powered WTR24 temperature transmitters, and the WTR-IM input module for bringing existing wired signals into the network.
4 Products · Wireless Proxima Mesh 2.4 GHz
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Proxima 2.4 GHz Wireless Mesh Guide
How the Proxima mesh network works
Each WTR or WTR-IM device joins the 2.4 GHz mesh and relays its reading, hopping through other devices where needed, to a single WBU base station. The base station then presents all the readings to the BMS over Modbus RTU, Modbus TCP or six analogue outputs, so from the controller's point of view it looks like any other wired point, even though nothing was cabled between the sensor and the panel.
How to choose the right Proxima mesh device
- Base station: one WBU per network, needed regardless of how many transmitters you add; it's the only device that talks to the BMS.
- Battery or mains transmitter: the WTR is battery-powered on a 3.6 V lithium cell (3600 mAh), for locations with no power; the WTR24 runs on 24 V where a supply exists nearby.
- Range: the WTR reaches up to 100 m line-of-sight, but typically 10 to 20 m indoors through walls and floors, so plan mesh hops or extra base stations for larger buildings.
- Update rate: the WTR's measurement interval is configurable from 30 to 180 s, trading battery life against responsiveness.
- Bringing in wired points: a WTR-IM input module reads three existing wired inputs and also measures temperature and humidity itself, useful when retrofitting a wireless network alongside sensors that are already cabled.
- Weak signal: if the WBU sits inside a steel cabinet, add the WA-AS1 external antenna to restore coverage.
For how wireless fits into a BMS retrofit overall, see wireless HVAC transmitters.
FAQ
Common questions
What frequency does the Proxima mesh use?
2.4 GHz, the same unlicensed ISM band used by Wi-Fi and Bluetooth, which the WBU base station, WTR and WTR24 transmitters and WTR-IM input module all share. Devices relay readings through the mesh to reach the base station even without a direct line of sight.
How does the WBU base station connect to the BMS?
Via Modbus RTU, Modbus TCP, or its six built-in analogue outputs, so it presents wireless readings to the controller in whichever format the BMS already expects. One WBU serves an entire mesh network of transmitters.
What does the WTR-IM input module measure?
It reads three external wired inputs, such as temperature, humidity, analogue or contact signals, and also measures temperature and humidity itself. This lets you bring sensors that are already cabled into the wireless network without rewiring them back to a panel.
What is the battery life of a WTR wireless transmitter?
The WTR runs on a 3.6 V lithium battery rated 3600 mAh, with its measurement interval configurable from 30 to 180 seconds; a longer interval extends battery life at the cost of a slower-updating reading. Exact battery life depends on the interval chosen and the mesh hop count to the base station.
What is the wireless range of a Proxima WTR transmitter?
Up to 100 metres line-of-sight, though typically 10 to 20 metres indoors once walls, floors and furniture are accounted for. For larger buildings, readings hop through other mesh devices to reach the WBU base station, so range planning should account for the mesh topology, not just distance to the base station.
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