CO2 + Temperature + Humidity Sensor transmitter RS485 output

Technical parameter

• Measuring range : 2000ppm/1%/3%/65%/100%
• DC power supply : 12-24VDC
• Precision : ±(50ppm+3%Readings) (25°C)
• Average current : <85mA
• NoN-linear : <1%F·S
• Output signal : RS485 Modbus
• Power : ≤1W（@12V DC 25°C）
• Working humidity environment : 0-95%RH
• Working temperature environment : -10-50 °C
• Pressure range : 0.9-1.1atm
• Temperature rang :-40°C ~ 80°
• Humidity range : 0%RH ~100%RH
• Accuracy Temperature : ± 0.5°C (25°C)
• Accuracy Humidity : 3%RH (5%RH ~ 95%RH, 25°C)
• Long-term stability Temperature : ≤0.1C/y
• Long-term stability Humidity : ≤1%RH/y
• Response time Temperature : ≤18S (1m/s)
• Response time Humidity : ≤6S (1m/s)

Interface Description

          Before you wiring and use, please read this article in detail, Improper use may result in irreversible damage to the product.

Communication protocol

Register Address

Communication example

    Read Device Address 0x01's Carbon Dioxide

Inquiry Frame

Answer Frames

How to calculate Carbon Dioxide

          01C3 H ( hexadecimal ) = 451 = 451ppm

    Read Device Address 0x01's Temperature And Humidity Value

Inquiry Frame

Answer Frames

How to calculate  Temperature And Humidity Value

          Temperature : 00AF H ( hexadecimal ) =175 17.5 °C

          00FE H ( hexadecimal ) =254 = 25.4%RH

    Read Device Address 0x01's Temperature And Humidity, Carbon Dioxide Concentration Value

Inquiry Frame

Answer Frames

How to calculate  Temperature And Humidity Value

          Temperature : 011B H ( hexadecimal ) = 283 = 28.3°C

          Humidity : 0314 H ( hexadecimal ) = 788 = 78.8%RH

          Carbon Dioxide : 01C3 H ( hexadecimal ) = 451 = 451ppm