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Thermokon · Air quality sensor · Modbus
LA+ RS485 Modbus
Outdoor and high-protection air quality sensor for CO2, VOC, temperature and humidity with Modbus RTU and analogue outputs.
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Part number700634
Datasheet, PDF
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- DHL, under 15 kg £13.50 ex VAT
- Technical support from the people who commission it
Overview
The LA+ measures CO2 and mixed gas (VOC), with optional temperature and humidity, outdoors and where a high IP rating is needed, such as tunnels, underground stations, exhibition halls, cold chains, greenhouses and warehouses. A sun and rain shield is supplied. It outputs over RS485 Modbus RTU and as 0 to 10 V or 0 to 5 V analogue signals. On CO2 and VOC versions each output can be set to a mix of the two. Versions with a relay can act as 2-point or 2-stage controllers, and an LCD option is available.
Specification13 values · 4 part numbers
Communication
- Protocol
- Modbus RTU (RS485), half-duplex, 9600 to 57600 baud
- Connection
- Removable M25 cable entry, plug-in terminal max. 2.5 mm², BUS max. 1.5 mm²
Electrical
- Power supply
- 15 to 35 V DC SELV or 19 to 29 V AC SELV
- Power consumption
- Max. 2.5 W (24 V DC), 4.3 VA (24 V AC)
Environment
- Operating temperature
- 0 to +50 °C
- Humidity
- Max. 85% rH, short term condensation
- Protection
- IP65
Performance
- Output signal
- 1 or 2 x 0 to 10 V or 0 to 5 V (min. load 10 kΩ), live-zero configurable
- Measuring range
- CO2 0 to 2000 or 0 to 5000 ppm; humidity 0 to 100% rH; temperature 0 to +50 °C by default
- Accuracy
- CO2 ±50 ppm +3% of reading, humidity ±2%, temperature ±0.5 K (typ. at 21 °C)
- Sensor element
- NDIR CO2 with dual channel self-calibration; VOC by heated metal oxide semiconductor
Physical
- Housing material
- PC, USE-M enclosure
- Colour
- Pure white, transparent cover
From the manufacturer's datasheet for LA+ RS485 Modbus.