Measuring range: 0 ~ 2000ug / m3 accuracy: ± 10% resolution: 1 ug / m3 power supply mode: DC12V / 24V wiring mode: voltage type: 3-wire, current type: 3-wire, RS-485 signal: 4-wire signal output: voltage type: 0 ~ 5V DC Current type: 4 ~ 20 mA RS-485 signal: support Modbus Protocol (baud rate 9600 can be set, address 0-255 can be set) instrument line length: standard configuration: 2.5m working temperature: - 10 ℃ ~ 65 ℃ relative humidity: 0 ~ 95% installation method: vertical installation