DS206Fluorescent blue-green algae sensor for water quality
monitoring in rivers and lakes RS485, MODBUS protocol
The online blue-green algae sensor uses the principle of
fluorescence method, which is more efficient and faster than the
traditional manua counting method, and can be monitored in real
time online. The senso has better repeatability and stability. With
automatic cleaning brush, it can eliminate air bubbles and reduce
the impact of contamination on the measurement, make the
maintenance cycle longer, and maintain excellen stability for
long-term online use It can play an early warning role on algae
reproduction.
Features
★ Digital sensor, RS-485 output, support MODBUS
★ With automatic cleaning brush to prevent contamination and
eliminate air bubbles
★ Direct measurement, simpler than traditional manual counting
method
★ Continuous online monitoring, real-time control of water quality
dynamics
Technical parameter
| Product name | Blue-green Algae Sensor |
| model | DS206 |
| principle | Fluorescence method |
| Range | 0-270, 000 cells/mL |
| Detection limit | 300 cells/mL |
| Resolution | 1 cells/mL |
| Linearity | R2>0.99 |
| temperature range | 0~ 50°C |
| Protection level | Ip68 |
| Sensor interface | Support RS-485, MODBUS protocol |
| Installation | Input type, |
| Power information | DC 5~12V, current <50mA |
| size | Φ45*175.8mm |
| Probe cable length | 10 meters (default), can be customized |
| Housing material | SS316 |
| Self-cleaning system | Have |
Calibration instructions
1,Calibration of blue-green algae sensors: The blue-green algae
sensor software (see the modbus manual) supports 2-point
calibration. The more common environmental research dye, rhodamine
B, can be used in sensor calibration.
2,Preparation
- First take 0.1g of rhodamine B solution into 1000mL reagent bottle
A, then add DI water or distilled water to 1000mL and shake well.
- Take 1mL of the above solution into 1000mL reagent bottle B, and
then add DI water or distilled water to 1000mL and shake well. The
solution concentration of reagent bottle B is 100 ppb.
- The prepared solution should be used within 24 hours.
3,Use
Rhodamine B shows that the fluorescence intensity is inversely
proportional to temperature. Use 100 ppb rhodamine B standard
solution. To properly set the sensor to ensure the sensitivity of
algae blue-green algae at 20 ° C, enter the calibration value
according to the temperature standard corresponding to the table
below. (The table below shows algae blue-green algae as a function
of temperature approximately equal to 100 ppb rhodamine B)
| Temp, ℃ | cells/ml |
| 26 | 54600 |
| 27 | 52471 |
| 28 | 51376 |
| 29 | 49670 |
| 30 | 47641 |
| 31 | 45276 |
| 32 | 43258 |
| 33 | 40711 |
| 34 | 38905 |
| 35 | 37298 |
| 36 | 34875 |
| 37 | 33370 |
Note: The calibration using rhodamine B standard solution is only an
approximate value. To ensure accurate readings, the fluorescence
readings obtained on site must be linked to the results obtained
from the extraction analysis of the above samples. Yushan used
Rhodamine B (Item # 70301027) from Keystone.
Warning: Rhodamine B is listed as a substance that may cause carcinogenesis
/ induction of organism mutations. Gloves must be worn during
operation.
Maintenance methods and common problems Maintenance schedule and
method
I. Maintenance schedule
Online blue-green algae sensor with automatic cleaning brush can be
automatically cleaned without frequent cleaning.
| Maintenance task | Recommended maintenance frequency |
| Calibrate the sensor (if required by the competent authority) | According to the maintenance schedule required by the competent
authority |
2. Maintenance method Sensor maintenance
- External surface of the sensor: Clean the external surface of the sensor with tap water. If debris
remains, wipe it with a moist soft cloth. For some stubborn dirt,
you can add some household washing solution to the tap water to
clean it.
- Check the cable of the sensor: the cable should not be tightened during normal work, otherwise
the internal wires of the cable will be easily broken and the
sensor will not work properly.
3) Check whether the measurement window of the sensor is dirty and
whether the cleaning brush is normal.
- Check the sensor's cleaning brush for damage.
- 18 months of continuous use, need to return to the factory to
replace the dynamic sealing device.
Frequently Asked Questions
| Error | Possible reason | solution |
The operation interface cannot be connected or the measurement
result is not displayed. | Controller and cable connection error | Reconnect controller and cable |
Cable failure | Please contact us |
The measured value is too high, too low or the value is continuously unstable | The sensor window is attached by a foreign object | Cleaning the sensor window surface |
| Damaged sensor sponge | Replace the sensor sponge |
Cable Definition
Power information
The power supply must be DC 5-12V +/-5%, current <50mA
Cable information
4 wire AWG-24 or AWG-26 shielding wire. OD=5mm
1, red line - power supply (VCC)
2, white line - 485 data _B (485_B) 3, green line --- 485 data _A
(485_A) 4, black line --- ground (GND)
5, bare line shielding layer
About Us
Xi'an Desun Uniwill Electronic Technology Co., Ltd (Hereinafter
referred to as Disen Sensing Company) is located in Xi'an High-tech
Development Zone. It is a high-tech company integrating production,
R&D, sales and engineering services. Relying on Xi'an's rich
high-tech resources, we have carried out technical cooperation with
many universities and scientific research institutions, constantly
breaking through technical barriers, improving product performance,
and using leading technology to provide high-quality products for
the water quality monitoring industry.
We launched a wireless water quality monitoring solution based on
the current rapid development of the Internet of Things technology,
combining smart terminals and traditional display units through
wireless transmission to achieve real-time dynamic water quality
monitoring functions such as data cloud display, remote cloud
control, and upper and lower limit alarms.
