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LFH21 series temperature and humidity controller is a product designed for indoor temperature and humidity detection and control. It has the advantages of small size, simple installation and convenient operation. It has special design for lightning surge, electrostatic discharge, group pulse, voltage resistance, etc., strong anti-interference ability, and alarm function. It can be widely used in places such as computer rooms, buildings, warehouses, etc. where temperature and humidity measurement and control are required.
Features
* Standard switch box installation method for easy use.
* Light and beautiful shell design, with LCD backlight to display dual temperature and humidity.
* Using imported high-precision sensors with good long-term stability and anti-interference ability.
* Optional passive temperature output.
* Temperature and humidity offset can be set to facilitate customer on-site operation.
* CE certification, ROSH
* With relay and alarm function
| LEFOO Indoor Temperature and Humidity Transmitter LFH21 | ||
| Relative Humidity | ||
| Sensor | Digital type | |
| Range | 0%~100%RH | |
| Output | RS485/Modbus,0~10VDC | |
| Accuracy | ±3%@ 20℃ & 20~80%RH | |
| Response time | ≤10s (20℃, slow flow air) | |
| Temperature | ||
| Sensor | Digital or passive thermal resistor, details refer to selection table | |
| Range | 0~50℃, -20~60℃, etc | |
| Output Signal | RS485/Modbus,0-10VDC | |
| Thermal Resistance | Details in selection table and thermal resistance graduation table | |
| Accuracy | Digital sensor: ±0.3℃@20℃, See table below ; Passive thermal resistance: typical ±0.2~0.4℃@25℃, refer to selection table | |
| Power Supply | RS485:15-35VDC/24VAC±20% | Voltage:15-35VDC/24VAC±20% |
| Note: when RS485 and voltage type uses AC power supply, an isolation transformer is required Output load | ||
| Output Load | ≥10kΩ(voltage output) | |
| Display Accuracy | 0.1℃,0.1%RH | |
| Display and buttons | LCD display and keys with unit display and backlight | |
| Alarm Function | 1xBUZZER,1xLED | |
| Relay | 2 x SPST, 3A / 30VDC, 3A / 250VAC | |
| Shell Material | PC | |
| Working Environment | -20~60℃, 5%-95%RH (Non-condensing) | |
| Protection Grade | IP30 | |
Standard switch box installation method for easy use.
Light and beautiful shell design, with LCD backlight to display dual temperature and humidity.
Using imported high-precision sensors with good long-term stability and anti-interference ability.
Optional passive temperature output.
Temperature and humidity offset can be set to facilitate customer on-site operation.
CE certification, ROSH
With relay and alarm function
Widely used in:
Comouter rooms
Buildinas
Warehousing
Places required temperature and humidity measurement and control .
Product Inquiry
