1. Measuring range:(0~20.00)mg/L、(-10~55.0)℃,adopt Optical DO Sensor;2. Resolution:0.01mg/L;3. Repeat-ability:±2%。4. Current isolated output: 4~20 mA(load<750Ω );5. Output current error:≤±1%FS;6. RS485communication interface(optional); DC24±2.4V,1A (optional);7. Protection grade:IP65;8. Working condition:Ambient temperature: 0~60℃ Relative humidity: <85%;9. Sensor installation method: the distribution or the type of the sensor, please specify when the order is not specified by the sinking type.