Monitoring of dissolved oxygen in the biochemical pool of sewage treatment plant; Surface water monitoring.
● Water and sewage treatment
Sewage treatment plant, aeration tank, power plant water treatment
● Water environment monitoring
Rivers, lakes, sea, etc.
● Aquaculture industry
Aquaculture
● Other
Food industry, chemical industr
Dissolved oxygen measuring instrument based on fluorescence quenching principle. Blue light irradiates the fluorescent material the fluorescent material excited and emit red light, because the oxygen molecules can take energy (quenching effect), so the concentration of excited red light time and intensity and inversely proportional to molecular oxygen. By measuring the phase difference between the red light and the reference lightand comparing with the internal calibration value, the concentration of oxygen molecules can be calculate.
maintenance free;
● No oxygen consumption, no flow rate and agitation requirements, no interference from the following substances: H2S, pH, Co2+, NH4+, SO42-, Cl-, Cl2, etc.;
● Digital sensor, with strong anti-interference ability and stability, sensor cable length up to several hundred meters;
● Sensor plug and play, automatic identification, support for dual channel input;
● The analyzer can provide isolated RS232 digital interface and isolated RS485 digital interface to support standard Modbus ASCII and Modbus RTU protocol;
● Support two languages: Chinese and English;
● Relay output programmable: any relay can be set to high alarm, low alarm, timer mode;
● With a history of automatic data storage, storage, query 10 years of historical data
Measurement performance
● Measurement range: 0.00~20.00mg/L or 0.00~20.00ppm,air saturation 0~200%
● Resolution: 0.01mg/L,0.01ppm
● Accuracy: ±1% or ± 0.15mg/L, the absolute value of the maximum
● Sensitivity: ±0.05mg/L
● Response time: 90%<30s; 95%<90s(20℃)
● Temperature compensation: NTC10KΩ automatic temperature compensation
● Calibration: factory calibration, one year without calibration, on-site calibration
● Display: LCD liquid crystal display date, time, measurement, historical trend line, Chinese and English menu options
● Data storage: automatic storage function, power failure data protection, storage, query 10 years of historical data
● Site settings: completed by the transmitter button
Output
● Analog output: isolation 0/4~20mA, maximum load 750Ω, fault state output current optional
● Relay output: 3 programmable relays can be set to alarm function and timing function
● Relay capacity: 2A, 250VAC
● Digital interface: MODBUS RS232/RS485, Profibus DPOptional
Power supply
● AC power supply: 85~265VAC,50Hz/60Hz
● DC power supply: 24VDC±10%
Physical property
● Transmitter size: 270×205×100mm
● Sensor size: Φ45×100mm
● Material: transmitter: PC+ABS sensor: 316L stainless steel
● Connection: 1 inch taper external thread
Environmental performance
● Protection level: transmitter: IP65 sensor: IP68
● Working temperature: transducer: -20℃ ~60℃, Sensor: 0 ℃~60℃
● Relative humidity: 0~95%, no condensation
● Working pressure: maximum 7.5Ba
