เซนเซอร์วัดค่า carbon dioxide sensors Co2 Rs485 4 in 1

For example, range 0 to + 5000 ppm, output 4 to 20 mA. When the output signal is 12 mA, calculate the current carbon dioxide concentration. range of concentration range This CO2 is 5000 PPM displayed as a current signal of 16 Ma, 5000 PPM/16 Ma = 312.5 PPM/Ma, i.e. a current of 1 mA represents a change in carbon dioxide concentration of 312.5 ppm. Measurement value 12 mA-4 mA = 8 mA. .8 Ma * 312.5 PPM/MA = 2500ppm The current carbon dioxide concentration is 2500 ppm.

(2) Voltage type output signal conversion calculation

For example, range 0~+5000ppm, output 0-10V. When the output signal is 5V, calculate the current carbon dioxide concentration. range of concentration range This CO2 is 5000 PPM expressed as a 10 V voltage signal, 5000 PPM/10 V = 500 PPM/V, i.e. a voltage of 1 V represents a change in carbon dioxide concentration of 500 ppm. The measured value is 5 V-0V = 5 V 5 V * 500 PPM/V = 2500 ppm. The current carbon dioxide concentration is 2500 ppm.

(1) Hardware connection

The device connects to the computer via USB to the 485 (Note: in the configuration only one 485 device is connected to the 485 bus).