DESCRIPTION
The sensitive components of LFH30 temperature and humidity transmitter adopt imported polymer film humidity sensitive capacitors and PT1000 temperature sensitive resistors.
The special breathable coating and SMD injection molding process can ensure the long stability of the probe in the environment of dust, salt spray pollution and high humidity condensation.
This precise temperature and humidity sensor is calibrated with mature humidity and temperature measurement technology to ensure the accuracy.
It is suitable for high-standard intelligent buildings, indicators, industrial dehumidifiers and other fields.
FEATURES
- Humidity measurement accuracy can reach ±2%RH.
- Imported humidity sensitive capacitors can resist condensation and pollution.
- Optional passive temperature output.
- Optional stainless steel probe rod, sintered/stainless steel wire mesh filter, durable and anti-blocking.
- CE certification, IP65, ROHS certification.
TECHNICAL DATA
| RELATIVE HUMIDITY | |
| Sensor | Humidity Sensitive Capacitor |
| Measuring Range | 0%~100%RH |
| Output | RS485/Modbus, 0~10VDC, 4~20mA |
| Response Time | ≤10s(20℃,slow air flow) |
| Accuracy | ±2%@ 20℃ & 20~80%RH |
| TEMPERATURE | |
| Sensor | Pt1000 or passive thermal resistance (Refer Selection Guide) |
| Measuring Range | 0~50℃, -20~60℃, etc |
| Output | 4~20mA, 0~10VDC, RS485/Modbus Optional |
| Work Temperature | -20~60℃, 5%-95%RH (Non-condensing) |
| Thermal Resistance | Refer Selection Guide |
| Output Load |
≤500Ω(current type) ≥2KΩ(voltage type) |
| Accuracy |
Digital sensor: 0.3℃ @ 5~60℃ Thermal resistance type: typical: ±0. 2~0. 4℃@25℃ |
| Display | LCD display optional, with unit display and backlight (4-20mA without backlight) |
| Power Supply |
RS485 type: 9~35VDC/24VAC+20% Voltage type: 12-35VDC124VDC+20% Curent type: 19.5~35VDC (RL=500Ω) /9.5-35VDC (RL=00) |
| Shell Material | PC housing, PC probe and polymer filter (optional stainless steel prcbe rod, sintered / stainless steel wire mesh fiter) |
| Protection Grade | IP65 |
SELECTION GUIDE
| Code and description | Remark | |||||||||
| LFH301- | Wall-mounted type temperature and humidity transmitter | Model | ||||||||
| LFH302- | Duct type temperature and humidity transmitter | |||||||||
| LFH303- | Split type temperature and humidity transmitter | |||||||||
| 2 | ±2%RH(0.3℃) | Accuracy range | ||||||||
| V10 | 0~10VDC (3-wired) | Humidity output | ||||||||
| A4 | 4~20mA (2-wired) | |||||||||
| RS | RS485/Modbus | |||||||||
| V10 | 0~10VDC(3-wired) | 0 | PT1000, ±2℃@0℃ | Temperature output | ||||||
| A4 | 4~20mA(2-wired) | 1 | PT100, ±2℃@0℃ | |||||||
| RS | RS485/Modbus | 2 | NTC20K, ±4℃@25℃ | |||||||
| 6 | NTC10K, ±4℃@25℃ | |||||||||
| 0 | NO | Temperature range | ||||||||
| 1 | 0~50℃ | |||||||||
| 2 | minus 20℃~60℃ | |||||||||
| 8 | Others (customer specified) | |||||||||
| 0 | No display | Display mode | ||||||||
| 1 | LCD display | |||||||||
| LFH301- | 2 | A4 | A4 | 1 | 1 |
Selection example |
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1. Only when the temperature output option is V10 or A4, the corresponding temperature range 1-8 should be selected; otherwise, only 0 can be selected.
2. Model example LFH301-2A4A411 represents the Wall-mounted type, accuracy 2%RH (0.3°C), humidity output 4-20mA, temperature output 4-20mA,
and temperature range 0-50°C with display.
3. Exposure of the sensor probe of this product to high concentrations of chemical gases for a long time may cause the reading of the sensor to shift.
4. When selecting a metal rod temperature and humidity transmitter, the specifications of the metal rod and front cover should be specified.
DIMENSIONS
LFH301 Wall-mounted type
LFH302 Duct type
LFH303 Split type
