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Thermokon · Air quality sensor · Modbus
LK+ RS485 Modbus
Duct air quality sensor for CO2 and VOC, with temperature and humidity options, an optional LCD and an RS485 Modbus RTU output.
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Part number662383
Datasheet, PDF
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- DHL, under 15 kg £13.50 ex VAT
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Specification
Communication
- Protocol
- Modbus RTU, half-duplex, RS485
- Interface
- RS485 Modbus, 9600 to 57600 baud; also 0 to 10 V or 0 to 5 V outputs
- Connection
- Plug-in terminal max. 2.5 mm², BUS max. 1.5 mm²; M20 and M25 cable entries
Electrical
- Power supply
- 15 to 35 V DC or 19 to 29 V AC
- 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 IP rating
Performance
- Sensor element
- NDIR (CO2), heated metal oxide semiconductor (VOC)
- Output signal
- 0 to 10 V or 0 to 5 V, 1 or 2 outputs, min. load 10 kohm
- Measuring range
- CO2 0 to 2000 or 0 to 5000 ppm; humidity 0 to 100% rH; temperature 0 to +50 °C
- Accuracy
- CO2 +/-50 ppm +3% of reading; humidity +/-2% rH at 10 to 90% rH; temperature +/-0.5 K, all typical at 21 °C
- Probe length
- 70, 100, 150 or 180 mm, 19.5 mm diameter
Physical
- Housing material
- PC, USE-M housing with transparent cover
- Colour
- Pure white
Part numbers
- 662109CO2 and VOC, no display
- 662116CO2 and VOC, LCD
- 662178CO2 and VOC, temperature, no display
- 662185CO2 and VOC, temperature, LCD
- 662192CO2 and VOC, temperature and humidity, no display
- 662208CO2 and VOC, temperature and humidity, LCD
- 662345CO2, temperature, no display
- 662352CO2, temperature, LCD
- 662376CO2, temperature and humidity, no display
- 662383CO2, temperature and humidity, LCD
- 670555CO2 (100 version), temperature, no display
- 670562CO2 (100 version), temperature, LCD
- 670579CO2 (100 version), temperature and humidity, no display
- 670586CO2 (100 version), temperature and humidity, LCD
- 662536VOC, temperature, no display
- 662550VOC, temperature, LCD
- 662574VOC, temperature and humidity, no display
- 662581VOC, temperature and humidity, LCD
From the manufacturer's datasheet for LK+ RS485 Modbus.
Overview
The LK+ measures air quality in ventilation ducts. Depending on the version it measures CO2, mixed gas (VOC) or both, with temperature or temperature and humidity added. Humidity versions can also output absolute humidity, enthalpy and dew point. The NDIR CO2 element self-calibrates on two channels. Each analogue output can be set to give a mix of CO2 and VOC through the USEapp or uConfig, and the sensor reports over RS485 Modbus RTU. LCD versions have an RGB backlit display with a traffic light function and configurable thresholds. The duct pipe is 19.5 mm in diameter and available in lengths of 70 to 180 mm. The housing has a hinged cover, plug-in terminals and removable cable entries.