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The LFG61 series is an all-in-one CO2, temperature, and humidity transmitter, capable of monitoring multipleparameters without the need for multiple devices. It uses non-dispersive infrared (NDIR) technology to detect CO2 andis equipped with high-precision temperature and humidity sensing elements. Featuring long service life and excellentstability, it is suitable for applications such as warehouse logistics, industrial HVAC, environmental monitoring, andgreenhouse cultivation, providing reliable data supportfor production safety and energy efficiency optimization.
Imported sensor with high accuracy and excellent stability.
Optional LCD backlight, displays CO2, temperature, and humidity simultaneously.
High linearity with temperature compensation.
CO2 sensor using NDIR infrared absorption detection principle.
Oxygen-independent CO2 sensor with long service life.
(1) Relative humidity
| Parameter | Specification |
| Sensor | Digital |
| Range | 0%~100%RH |
| Output | RS485/Modbus, 0~10VDC, 4~20mA |
| Accuracy | ±3%@20°C & 20~80%RH |
| Response time | ≤10s(at 20°C, in slow-flowing air) |
(2) Temperature
| Parameter | Specification |
| Sensor | Digital or RTD (see selection table) |
| Range | 0~50°C, -20~60°C, etc. |
| Output | RS485/Modbus, 0~10VDC, 4~20mA |
| RTD | See selection table and RTD calibration table |
| Accuracy | Digital sensor: ±0.5°C (@0~50°C), see table below RTD: Typical ±0.2~0.5°C @25°C, see selection table |
(3) CO2
| Parameter | Specification |
| Sensor | NDIR sensor with ABC self-calibration function |
| Sensor life | > 5 years |
| Range | 0~2000ppm, 0~5000ppm, etc |
| Accuracy | ±(40±3%MV)ppm |
| Output | RS485/Modbus, 0~10VDC, 4~20mA |
| Response time (T₉₀) | 2min |
Power Supply: 16~35 VDC / 24 VAC ±20%
Note:When using AC power, an isolation transformer is required
Output Load: ≥10 kΩ (voltage type); ≤500 Ω (current type)
Display Resolution: 0.1 °C, 0.1 %RH, 1 ppm
Display and Buttons: Optional LCD with unit display, backlight, and buttons
Relay: 1 × SPDT, 3 A / 30 VDC, 3 A / 250 VAC
Enclosure Material: Housing: PC; Probe: Pa6
Operating Environment: Probe: -20~60 °C & 5~95 %RH (non-condensing)
Housing: 0~50 °C & 5~85 %RH (non-condensing)
Storage Environment: -20~60 °C
Protection Rating: IP65 (excluding probe), IP30 (including probe)
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