The S500M-01 transmitter is built-in with a low-power consumption and high-precision microprocessor. It adopts catalytic combustion, electrochemical and thermal conductivity sensor technologies to convert the concentration signal of the target gas leaked in the air into electrical signals for output. The product has the advantages of stable performance and sensitive response. The electrical signal output by the transmitter adopts 4-20mA analog signal or RS485 digital communication mode, which can be directly uploaded to monitoring devices such as DCS, GDS, and PLC. The output signal of the transmitter has the advantages of high precision and long transmission distance. The transmitter can also be used independently and has passive switch output to control other devices on site. It is suitable for different places such as vegetable greenhouses, underground garages, and breeding farms.