KFDO900 dissolved oxygen meter water quality stainless steel probe
Product Introduction
Fluorescence method oxygen dissolved meter is based on the quenching principle of specific substances to active fluorescence in physics.The figure as follow is the schematic diagram of the sensor's work. The fluorescent substance at the front of the sensor is a special platinum porphyrin composite with polyester foil allowing gas molecules to pass through, and the surface is coated with a layer of black light-proof material to avoid interference from sunlight and other fluorescent substances in the water.
The modulated blue light shines on the fluorescent material and causes it to excite and emit red light. Since oxygen molecules can carry away energy (quenching effect), the time and intensity of red light excitation are inversely proportional to the concentration of oxygen molecules.We used the red light source synchronized with blue light as the reference, measured the phase difference between the excited red light and the reference light, and compared it with the internal calibration value, so as to calculate the concentration of oxygen molecules, and output the final value through temperature compensation.
Performance characteristics:
- No oxygen is consumed, so there is no flow rate, no agitation, and no interference by substances such as sulfide.
- Lightning proof enclosure
- antiflaming material
- Outdoor water-proof design is suitable for a variety of installation environment
- 316L stainless steel probe
- professional shielded cable
- Ultra wide power input range:85-265VAC,Suitable for many countries and regions
- digital transmission signal,strong anti-interence ability,high stability.
- support analog ouput:0-20mA,4-20mA,digital ouput:RS485,modbus
- Up to three relay outputs
- Strong resistance to cross interference of various substances: H2S, PH, CO2, NH3, SO4, CL-, CL2, CLO2, MeOH, EtOH, and various other ions.
- no need to replace electrlyte solution ,do not need to polish clean anode,cathode
- low follow-up replacement cost is low,eletrode rod durable/quality light source system,durable
- Built-in temperature sensor,automatic temperature compensation
- There has built-in salinity compensation curve in sensor,strong consistency
Apply:
Surface water, industrial sewage and municipal sewage
Q&A
What are the factors that affect dissolved oxygen?
The content of dissolved oxygen in water is affected by two effects: one is the oxygen consumption effect that reduces DO, including the oxygen consumption of aerobic organic matter degradation and advanced metabolic oxygen consumption;The other is the reoxygenation effect that makes DO increase, mainly including the dissolution of oxygen in the air, aeration means, etc.The mutual ebb and flow of these two kinds of action makes the dissolved oxygen content in water change in time and space.
The environmental factors affecting the content of dissolved oxygen in water include water temperature, oxygen partial pressure, salinity and so on.
1. The water is warm
At a certain oxygen partial pressure and salt content, the saturated content of dissolved oxygen decreases with the increase of water temperature.The saturation content of dissolved oxygen at low temperature varies more significantly with temperature.
2. Salt
When the water temperature and oxygen partial pressure are constant, the higher the salt content of water, the lower the saturated content of dissolved oxygen in water.The salt content of sea water is much higher than that of fresh water, and under the same conditions the saturated content of dissolved oxygen is much lower in sea water than in fresh water.The variation range of salt content in natural fresh water is very small, so the salt content has little influence on the saturated content of dissolved oxygen, which can be approximately calculated by the saturated content in pure water.
3. Partial pressure of oxygen
When the water temperature has a certain salt content, the saturated salt content of dissolved oxygen in water increases with the increase of partial pressure of oxygen on the liquid surface.
Technical Parameters of Fluorescence Dissolved Oxygen Analyzer
| Class | Performance | Parameter |
| Transmitter | Size | 230×185×120mm |
| Weight | 1.5kg |
| Storage Temperature | -40-60℃ |
| Temperature | -20-60℃ Avoid direct sunlight |
| Relative humidity | 5%~85% (no condensation) |
| Supply | 220VAC±10%,50Hz |
| Analog output | 4~20mA output or 0~20mA output (dissolved oxygen value or saturation), loop load maximum 750 ohms;Optional temperature 4~20mA output |
| The relay outputs | 3 relays with A capacity of 220 VAC/ 2 A. The outputs can be set for alarm or timing functions |
| Protective grade | polycarbonate enclosure, IP65 |
| Field display | LCD display with backlit |
| Digital interface | RS232 or RS485 interface, Modbus protocol can be supported. |
| Sensor | Measurement range | dissolved oxygen: 0.00~20.00mg/ L or 0.00~20.00 PPM air saturation: 0~200% |
| Resolution | 0.01mg/L |
| The measurement accuracy | ±1%FS or ±0.15mg/L with the largest value |
| Repeatability | ≤0.2mg/L |
| Response time | less than 60 seconds |
| Temperature sensor | Working range: 0~60°C;Resolution: 0.01°C Accuracy: ±0.5°C;Response time: less than 10 seconds |
| Storage temperature | -20°C ~60°C |
| Ambient temperature | -20°C ~60°C |
| Medium temperature | 0℃~50℃ |
| Maximum mounting depth | 10 m |
| Chemically adaptation | methanol and ethanol are safe to avoid other organic solvents |
| Calibratation | Anoxic water and air were used for calibration respectively.It has been calibrated before leaving the factory, and generally there is no need to calibrate. |
| Anti-interferense | It is not subject to cross interference of H2S, PH, CO2, NH3, SO4, CL-, CL2, CLO2, MeOH, EtOH, and various other ions. |
| Foil | Polyester embedded with platinum porphyrin fluorescence |
| Light-proof coating | teflon |
| Foil life | up to 5 years (10 second measurement interval) |
| Sensor shell size | 45 x 100 Φ |
| Weight | 1.2 kg |
| Cable standard | 10 meters |
| Sensor shell | stainless steel |
Ordering Information selection table
| Ordering Information selection table |
| KFDO900 | Fluorescence Dissolved Oxygen Meter |
| | Power supply |
| DC24V |
| AC220V |
| | Cable length |
| 10m |
| 15m |
| 20m |
| 30m |
| | Signal output |
| Only 4-20mA |
| Only 485 |
| Also with 4-20mA , 485 signal output |
| Special custom signal |
| KFDO900- | AC220V | 10m | Only 485 | with AC220V adapter, cable between host and sensor,The cable length is 10 meters, the sensor is equipped without temperature compensation, and is equipped with only 485 communication signal output.
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Contact us
Website: www.kacise.com
Phone: +86-17719566736
Email: sales@kacise.com
Location: Tangyan South Road, High-tech Zone, Xi'an City, Shaanxi Province, China
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RS485 220VAC Stainless Steel Probe Dissolved Oxygen Sensor Images
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