DS206 Fluorescence blue-green algae sensor for water quality
monitoring of drinking water sources in pond marine survey
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.
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
Company philosophy
We are committed to the water quality monitoring industry, actively
innovating and improving products, and optimizing industry
application solutions. We take technology and quality as the
cornerstone, honesty and service as the foundation, do a good job
of water quality monitoring with our heart, and contribute to the
development of the water quality monitoring industry. power. At
present, the products are sold to more than 30 countries and
regions overseas, and they have established their own sales network
locally, cooperate with after-sales and maintenance personnel, and
continue to supply water body monitoring equipment.
In 2021, we will further increase the proportion of the domestic
market on the basis of innovating high-quality products and
improving technical services. Increase the after-sales maintenance
force in first-tier cities to provide customers with timely and
effective products and services.
