Category
Wireless HVAC Transmitters for BMS
Add temperature and other sensors to your BMS without new cabling, ideal for retrofits.
Wireless HVAC transmitters add sensors to an occupied building without opening ceilings or pulling new cable, often the most expensive part of a BMS upgrade. The Produal Proxima mesh measures room temperature at 2.4 GHz and reports to a WBU base station over Modbus or analogue outputs, with the WTR-IM module bringing in existing wired inputs.
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Selection guide
Wireless HVAC Transmitters for BMS Guide
Where wireless HVAC sensors make sense
- BMS retrofits: in occupied offices, hotels and hospitals.
- Heritage or glass buildings: where cables can't be hidden.
- Temporary monitoring: during commissioning or energy audits.
- Re-planned spaces: after handover, where a new cabled run isn't practical.
- Why: in each case, the cost and disruption of chasing walls or pulling new containment through finished spaces outweighs the extra cost of a wireless transmitter over a wired one.
How to plan a Proxima wireless system
- Base station: the Proxima 2.4 GHz mesh needs one WBU base station per network, which outputs to the BMS over Modbus RTU, Modbus TCP or six analogue outputs.
- Sensor per point: add a WTR battery-powered transmitter for each room needing temperature, or a WTR24 where 24 V power is already available.
- Existing wired signals: a WTR-IM input module brings up to three existing wired inputs into the wireless network, alongside its own temperature and humidity measurement.
- Coverage: if the WBU sits inside a steel control cabinet, radio signal drops; add the WA-AS1 external antenna to move the antenna outside the cabinet.
- Planning info: a floor plan, the number of measuring points and the BMS panel location let us suggest how many base stations you need and where.
- Larger buildings: where one base station's mesh can't reach every point reliably, add a second WBU for another zone or floor, each reporting to the BMS independently over Modbus.
For the wider wireless product line beyond HVAC, see wireless sensors and transmitters. For the individual mesh components, see Proxima 2.4 GHz wireless mesh.
FAQ
Common questions
Can wireless transmitters feed an existing wired BMS?
Yes. Wireless readings reach the BMS through the WBU base station over Modbus or analogue outputs, appearing to the controller exactly like any other point, so they sit alongside your existing wired sensors without special handling.
Should I choose the WTR or the WTR24 transmitter?
Choose the WTR, which is battery-powered, for spaces with no power nearby, such as a room where running a new cable is the problem you're trying to avoid. Choose the WTR24 where a 24 V supply is already available at the sensor location, avoiding battery replacement.
What information do you need to plan a wireless HVAC system?
A floor plan, the number of measuring points and the location of the BMS panel or base station. From that we can suggest the number and position of WBU base stations, and whether an external antenna is needed for any steel cabinets.
Why choose wireless over a cabled BMS retrofit?
Cabling an occupied building is often the most expensive and disruptive part of a BMS upgrade, involving opened ceilings, pulled cable and repainted walls. A wireless Proxima transmitter avoids most of that, connecting to the network in minutes rather than requiring a containment run back to the panel.
Does wireless HVAC monitoring work in heritage or glass buildings?
Yes, it's one of the main reasons to choose it. Heritage buildings where cables can't be chased into walls, and glass or steel structures where containment would be visually intrusive, both suit a battery-powered wireless transmitter over a new cabled installation.
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