Products Description
DESCRIPTION
LFH20 series temperature and humidity transmiter is specially designed for indoor temperature and humidity detection Atransmiter with smal size,simple installation and easy operation.Its pair of lightning strikesSurge,electrostatic discharge,grouppulse,withstand voltage,etc.have special design,anti-interference abiiyStrong force.There are three output modes available:current voltage,and RS485.Can be widelylt is used in computer rooms,buildings,warehouses and other places wheretemperature and humidity measurement is required.
SPECIFICATION
①Relative Humidity | |
Transmitter | Digital |
Range | 0%~100%RH |
Output | RS485/Modbus,0~10VDC,4~20mA optional |
Accuracy | ±3%@20℃&20~80%RH |
Response time | ≤10s(20℃,slow flow air) |
②Temperature | ||
Transmitter | Digita or thermal resistance,see model selection table | |
Range | 0~50℃,-20~60℃ | |
Output | 4~20mA,0~10VDC,RS485/Modbus optional | |
Thermal resistance | See model selection instruction and thermal Resistance index table | |
Accuracy | Digital type:±0.3℃@20℃;Thermal resistance type:±0.2~0.4℃@25℃、See selection table | |
Power supply | Voltage type/RS-485:15~35VDC/24VAC±20% | Current Type:19.5~35VDC(RL=500Ω)/ |
Output load | ≤500Ω(Current type)、≥2KΩ(Voltage type) | |
Display | LCD display optional,with unit display and backlight (4~20)mA output without backlight | |
Case Materia | PC case | |
Working Environment | -20~60℃,5%-95%RH (Non-condensing) | |
Protection Grade | IP30 | |
Code and Description | Remark | |||||||||||||
LFH20 | Indoor temperature and humidity transmitter | Model | ||||||||||||
3 | ±3%RH(±0.3℃) | Accuracy | ||||||||||||
V10 | 0~10VDC(3-wired) | Humidity | ||||||||||||
A4 | 4~20mA(2-wired) | |||||||||||||
RS | RS485/Modbus | |||||||||||||
N | No output | |||||||||||||
V10 | 0~10VDC(3-wired) | 2 | NTC20K,±0.4℃@25℃ | Temperature | ||||||||||
A4 | 4~20mA(2-wired) | 3 | NTC10K,±0.4℃@25℃ | |||||||||||
RS | RS485/Modbus | N | No output | |||||||||||
0 | PT1000,±0.2℃@0℃ | |||||||||||||
1 | PT100,±0.2℃@0℃ | |||||||||||||
0 | NO | Temperature | ||||||||||||
1 | 0~50℃ | |||||||||||||
2 | -20~60℃ | |||||||||||||
8 | other(Customized) | |||||||||||||
0 | NO | Display | ||||||||||||
1 | LCD display | |||||||||||||
| Model Example | |||||||||||||
1.Only when the temperature output option is V10 orA4,the corresponding temperature range 18 needs to be selected;otherwise only 0 can be selected.
2.Example LFH203A4A411 represents indoor type,temperature and humidity accuracy is±3%RH(±0.3℃),humidityoutput 4~20mA temperature output 4~20mA,temperature range 0~50℃,with display.Example 2:LFH203NRS01represents indoor type temperature accuracy is±0.3℃,no humidity output,temperature output RS485,no temperaturerange,with display Example 3:LFH203A4NO1 representsindoor type,humidity accuracy is±3%RH,humidity output4~20 mA,no temperature output,no temperature range,with display.
3.Prolonged exposure of this product's sensor probe to high concentrations of chemical gases may cause the sensor'sreadings to shift.
PRECAUTIONS
1.Avoid installation in areas that are prone to heat transfer and will directly cause a temperature difference with thearea to be measured,otherwise the temperature and humidity measurement willbe inaccurate.
2.Installin a relatively stable environment,avoid direct sunlight away from windows,air conditioners,heating andother equipment,and avoid facing windows and doors.
3.Not suitable for use in environments with oil,organic solvents and corrosive gases.
4.When not in use for a long time,please store it in a dry environment.
