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The probe of Digital Temperature and Humidity Transmitter LFH50 is mainly composed of a temperature-sensitive resistor and a humidity-sensitive capacitor. The resistance value of the temperature-sensitive resistor is proportional to the temperature. The capacitance value of the humidity-sensitive capacitor is related to the surrounding humidity. The higher the humidity, the lower the capacitance value. The core components of the digital temperature humidity sensor LFH50 are the silicon chip and the control circuit. The control circuit will read the changes in resistance and capacitance and the silicon chip will generate 0-5V or RS485 signals. The advantage of the temperature and humidity sensor LFH50 is not consumed power and can still provide real-time and accurate temperature and humidity monitoring even when the power is off.
Feature
* Two outputs Temperature and Humidity
* Anti-interference
* CE and RoHS certificated
| LEFOO Temperature and Humidity Transmitter with Display LFH50 | |||||
| Note: The relative humidity table and temperature table are separate | |||||
| Relative Humidity | Temperature | ||||
| Sensing Element | Digital | Sensing Element | Digital or thermal resistance, see Models Selection Table | ||
| Measure Range | 0%~100%RH | Measure Range | 0~50℃, -20~60℃ | ||
| Output | RS485/Modbus,0~10VDC,4~20mA | Output | 4~20mA, 0~10VDC, RS485/Modbus | ||
| Response Time | ≤10s(25℃， slow flow air) | Work Temperature | -20~60℃,5%-95%RH(non-condensing) | ||
| Accuracy | ±2%@ 25℃ & 60%RH | Accuracy | Digital sensing element: ±0.5℃@25℃ | ||
| Model | LFH101 Wall Mounted Type | Voltage Type | RS 485 Type | Current Type | |
 | 15~35V dc 24V ac ±20% | 15~35V dc 24V ac ±20% | 18.5~35VDC (RL=500Ω) 8.5~35VDC (RL=0Ω) | ||
Protection Level | IP65 | ||||
| Model | LFH102 Duct Type | Output Load | ≤500Ω(Current Type)，≥2KΩ(Voltage Type) | ||
 | Display | LCD display optional, with unit display and backlight(4~20mA output without backlight) | |||
| Model | LFH103 Split Type | Case Material | PC case, PC probe, Polymer filter（stainless probe and stainless filter optional) | ||
 | Thermal resistance | Serial number 0,1,2,3,4,5,6 on model selection table | |||
| Model Selection Table | ||||||||||
| Code and description | Remark | |||||||||
| LFH101- | Wall-mounted temperature and humidity transmitter | Model | ||||||||
| LFH102- | Duct type temperature and humidity transmitter | |||||||||
| LFH103- | Split type temperature and humidity transmitter | |||||||||
| 2 | ±2%RH(0.3℃ | Accuracy range | ||||||||
| 3 | ±3%RH(0.3℃ | |||||||||
| V10 | 0~10VDC(Three-wired) | Humidity output | ||||||||
| A4 | 4~20mA(Two-wired) | |||||||||
| RS | RS485/Modbus | |||||||||
| V10 | 0~10VDC(Three-wired) | 2 | NTC20K | Temperature output | ||||||
| A4 | 4~20mA(Two-wired) | 3 | Ni 1000 | |||||||
| RS | RS485/Modbus | 4 | NTC10K-II | |||||||
| 0 | PT1000 | 5 | NTC10K-III | |||||||
| 1 | PT100 | 6 | NTC10K-A | |||||||
| 0 | NO | Temperature range | ||||||||
| 1 | 0~50 | |||||||||
| 2 | minus 20~60 | |||||||||
| 8 | Others (customer specified) | |||||||||
| 0 | No display | Display mode | ||||||||
| 1 | LCD display | |||||||||
| LFH101- | 2 | RS | 3 | 1 | 1 | Selection example | ||||
A variety of installation methods and output methods are optional
The shell design is light and beautiful, with LCD backlight temperature and humidity dual display
The power supply and output have over-voltage and reverse connection protection , with a high protection grade IP65
Adopt high-precision sensors and main control , with good long-term stability and anti-interference ability
Temperature and Humidity monitoring. Commonly application areas are such as business campus, theaters and museums, stock room, workshop,halls and subway station, Rail transit project，Hospital clean room, Boiler Room
The Temperature Humidity Transmitters are used in PLC, dehumidifier, high standard air conditioner, Supporting infrastructure projects, Metallurgical Automation, Painting equipment
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