1. Description

Multi in one sensor (Air temperature and humidity, NH3, H2S, CO2)  As an on-site collection slave station, it outputs digital signals according to the standard MODBUS-RTU communication protocol RS485, suitable for long-distance network transmission.
It can be widely used in factories, commercial buildings, intelligent aquaculture, public toilet environmental protection, animal husbandry, and other atmospheric environment monitoring.

2. Parameter

Air temperature measurement range: -40~80 degrees Celsius
Air temperature measurement accuracy: ± 0.5 degrees
Air temperature resolution: 0.1 degrees
Air temperature repeatability: ± 0.2 degrees
Air temperature drift: ＜ ± 0.1 degrees Celsius/year

Air humidity measurement range: 0-100RH%
Air humidity measurement accuracy: ± 3RH%
Air humidity resolution: 0.1% RH
Air humidity repeatability: ± 1% RH
Air humidity drift: ＜ ± 0.5% RH/year
Measurement stability time: 2 seconds
Response time:<5 seconds

NH3 measurement principle: electrochemical
NH3 detection method: online monitoring, diffusion type
NH3 measurement range: 0~50/100ppm
NH3 resolution: 0.1PPM
NH3 measurement accuracy: ＜± 4%
NH3 measurement stability: ＜± 2%
NH3 measurement repeatability: ＜± 2%
NH3 measurement sensitivity: 0.1 ± 0.03uA (ppm)
NH3 probe lifespan: 2 years (2ppm/NH3)
Measurement stability time: 2 seconds
Response time: ＜ 60 seconds
Temperature compensation: equipped with
Internal filtration: removes cross interference of H2S, SOX, and NOX gases

H2S measurement principle: electrochemical
H2S detection method: online monitoring, diffusion type
H2S measurement range: 0~50/100PPM
H2S resolution: 0.1PPM
H2S measurement accuracy: ＜± 4%
H2S measurement stability: ＜± 2%
H2S measurement repeatability: ＜± 1%
H2S measurement sensitivity: 0.8 ± 0.15uA (ppm)
H2S probe lifespan: 2 years (in air)
Measurement stability time: 2 seconds
Response time: ＜ 30 seconds
Temperature compensation: equipped with

CO2 measurement method: NDIR dual channel non dispersive infrared measurement principle
CO2 measurement range: 400~5000PPM
CO2 measurement accuracy: ± 5%
CO2 resolution: 1ppm
CO2 measurement repeatability: ± 1%
Preheating time: 120 seconds
Response time: 60 seconds

Communication interface: RS485
Communication rates: 2400, 4800, 9600, 19200, 38400, 115200. Default 9600bps
Communication protocol: MODBUS-RTU
Data format: 1, 8, 1, 9600, N (1-bit start bit, 8-bit data bit, 1-bit stop bit, no checksum, 9600bps baud rate)
Terminal category: Slave station
Node address: 001~255
Number of nodes: 31
Transmission distance: 500 meters (RS485 communication dedicated cable)