Fluorescence based dissolved oxygen sensor
The fluorescence method dissolved oxygen sensor is based on the principle of fluorescence quenching. Blue light is irradiated onto the fluorescent substance to excite it and emit red light. Due to the quenching effect, oxygen molecules can take away energy, so the time and intensity of the excited red light are inversely proportional to the concentration of oxygen molecules. By measuring the lifetime of excited red light and comparing it with internal calibration values, the concentration of oxygen molecules can be calculated.
Product parameter
Output signal: Adopting RS485 serial communication and MODBUS protocol
Power supply: 9VDC（8～12VDC）
Dissolved oxygen measurement range: 0～20 mg∕L
Dissolved oxygen measurement accuracy: < ±0.3 mg/L（Dissolved oxygen value＜4 mg/L）/< ±0.5mg/L（Dissolved oxygen value＞4 mg/L）
Repeatability of dissolved oxygen measurement: < 0.3mg/L
Zero offset of dissolved oxygen: < 0.2 mg/L
Dissolved oxygen resolution: 0.01mg/L
Temperature measurement range: 0～60℃
Temperature resolution: 0.01℃
Temperature measurement error: < 0.5℃
Working temperature: 0～40℃
Storage temperature: -20～70℃
Sensor external dimensions: φ30mm*120mm；φ48mm*188mm