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Thermokon · Air quality sensor · Modbus

LP+ RS485 Modbus

Name: LP+ RS485 Modbus
Brand: Thermokon

Pendulum CO2, temperature and humidity sensor for large rooms with Modbus RTU and analogue outputs, on a 5 m cable.

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Part number776233

Datasheet, PDF

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DHL, under 15 kg £13.50 ex VAT
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Specification

Datasheet

Communication

Protocol: Modbus RTU over RS485, 9600 to 57600 baud
Connection: Removable M20 and M25 cable entries, plug-in terminals up to 2.5 mm²

Electrical

Power supply: 15 to 35 V DC or 19 to 29 V AC
Power consumption: Maximum 2.5 W (DC), 4.3 VA (AC)

Environment

Operating temperature: 0 to +50 °C
Protection: IP20 sensor, IP65 enclosure IP rating

Performance

Output signal: 2 x 0 to 10 V or 0 to 5 V, jumper selectable, minimum load 10 kΩ
Measuring range: CO2 0 to 2000 or 0 to 5000 ppm; humidity 0 to 100% rH, non-condensing
Accuracy: CO2 +/-50 ppm + 3% of reading; humidity +/-2% between 10 and 90% rH; temperature +/-0.5 K at 21 °C
Sensor element: NDIR for CO2

Physical

Cable length: 5 m for these versions (1.5, 3 and 7.5 m also made)
Housing material: PC, USE-M enclosure
Colour: Pure white, transparent cover

Part numbers

From the manufacturer's datasheet for LP+ RS485 Modbus.

Overview

The LP+ hangs from a cable to measure CO2 in large rooms such as exhibition halls, factories and museums. These versions also measure temperature and relative humidity, and can calculate absolute humidity, enthalpy and dew point. It connects over RS485 Modbus RTU and has two analogue outputs of 0 to 10 V or 0 to 5 V for a BMS or monitoring system. The CO2 element is NDIR with dual channel self-calibration. The LCD version has a colour display with traffic light function.