Mianyang lake environmental monitoring water quality dissolved oxygen detection transmitte

  The oxygen consumption and reproduction of all living organisms in Mianyang lake are inseparable from the monitoring of oxygen consumption and water quality
The content of oxygen in the air is high and stable, accounting for about 21%, so there is little threat of hypoxia on land; However, the amount of dissolved oxygen in water is small and changeable; Generally, the amount of saturated dissolved oxygen in fresh water is only equivalent to 1 / 20 of the oxygen content in the air, and less in seawater
Therefore, the amount of dissolved oxygen in water has become a limiting factor in the life phenomenon and life process of aquatic animals, and it is one of the most important factors in aquaculture

Importance of online use of dissolved oxygen measurement and control instrument:
1
Users can intuitively see the real-time data of dissolved oxygen in aquaculture water environment through the device display window, so as to avoid the disadvantages of intermittent, fixed-point and regular detection of reagents and test paper

2
Through the real-time dissolved oxygen data, it provides a basis for farmers to scientifically regulate the dissolved oxygen in the aquaculture water environment, increase oxygen reasonably and reduce the power cost of aquaculture

3
Through the real-time data of dissolved oxygen, the feeding time and amount were optimized, the feed coefficient was optimized, and the feed cost was reduced

4
Through the short, medium and long-term change trend of dissolved oxygen, predict the water quality of aquaculture in advance, and regulate the water quality through water change and rational use of chemicals, so as to reduce the aquaculture risk and optimize the effect of aquaculture chemicals

5
The automatic opening / closing and alarm reminder of the oxygenation equipment are realized through the equipment linkage control device, so as to avoid the disadvantages of manual duty and reduce the labor cost of breeding

However, in the practice of aquaculture production, due to the general lack of timely and effective monitoring means for dissolved oxygen in water for a long time and insufficient understanding of the potential hazards of dissolved oxygen changes in water, many aquaculture groups consider the cost of oxygenation, take the presence or absence of floating head of aquaculture organisms as the judgment standard for the adequacy of dissolved oxygen in water, and take oxygenation measures only after seeing floating head, which actually takes oxygenation as a kind of & ldquo; Help; measures; Some breeding groups are worried about the impact of hypoxia on breeding organisms, do not consider the actual dissolved oxygen status, and continuously increase the oxygen in the breeding water environment, so that the oxygen concentration in the water body has been in a high state
These are unscientific management methods, which often lead to unnecessary losses or reduce potential benefits

1
Role of dissolved oxygen sensor in aquaculture:
(1) Provide oxygen necessary for the life activities of farmed animals
(2) It is conducive to the growth and reproduction of aerobic microorganisms and promote the degradation of organic matter
(3) Reduce the effect of toxic and harmful substances
(4) Inhibit the activity of harmful anaerobic microorganisms
(5) Enhance the immunity of cultured aquatic products
Mianyang lake environmental monitoring water quality dissolved oxygen detection transmitter
2 dissolved oxygen in water and its influencing factors:
Dissolved oxygen in water is dissolved in water in molecular state
The dissolution (dissolution) and desorption (escape) of oxygen in water is a dynamic reversible process
When the dissolution and desorption rates are equal, the dynamic equilibrium of dissolved oxygen is reached
At this time, the concentration of dissolved oxygen in water is the saturated content of dissolved oxygen under this condition, that is, the saturated dissolved oxygen
The amount of saturated dissolved oxygen in water is affected by the combined action of atmospheric oxygen partial pressure, water temperature and the content of other solutes in water (such as other gases, organic or inorganic substances)
There is a positive correlation between saturated dissolved oxygen in water and atmospheric oxygen partial pressure
Under natural conditions, atmospheric oxygen partial pressure will not change significantly, so the influence on saturated dissolved oxygen can be ignored
With the increase of water temperature, the amount of saturated dissolved oxygen decreases; Salinity also has a direct and obvious effect on dissolved oxygen
With the increase of water salinity, the amount of saturated dissolved oxygen decreases

In most cases, the actual content of dissolved oxygen in aquaculture water is lower than the saturated dissolved oxygen, and its value depends on the result of the dynamic balance between oxygen increase and oxygen consumption in water at that time
When the oxygen increase is greater than the oxygen consumption, the dissolved oxygen tends to be saturated, and sometimes & ldquo; Supersaturation & rdquo; Phenomenon, which usually occurs in ponds with high algae density and strong photosynthesis on sunny afternoons; When the oxygen consumption is dominant, the dissolved oxygen in the water begins to decline continuously, and as a result, there will be low oxygen or even anaerobic water areas
At this time, farmed animals & ldquo; Floating head;, Even & ldquo; Flooding Pond & rdquo; Phenomenon
In pond culture, the oxygenation in water mainly comes from the photosynthesis and oxygen release of phytoplankton, artificial oxygenation (mechanical oxygenation, chemical oxygenation, etc
) and the natural dissolution of oxygen in the atmosphere, but the proportion of the above oxygenation is also different under different conditions
The eutrophic still water pond is mainly oxygenated by photosynthesis, the high-density intensive culture pond is mainly oxygenated manually, and the eutrophic water body and flowing water body contribute greatly to the oxygenation by atmospheric dissolution

If you want to do a good job and strengthen aquaculture, you also need scientific aquaculture technology and professional aquaculture equipment
Combining these two items is the future trend of aquaculture industry
I'd like to introduce two aquaculture equipment that the aquaculture industry can't miss & ndash; Dissolved oxygen sensor

Electro dissolved oxygen sensor under cloud borne iot-amt-pr300, atm-w400
The amt-pr300 and atm-w400 series dissolved oxygen sensors and water quality multi parameter detector contain a large capacity electrolytic cell, the oxygen permeable film is easy to replace, and the reliable primary battery measurement technology is adopted to support long-time work
Ideal for aquaculture and wastewater monitoring applications, these do sensors require minimal maintenance
Contains PTFE or high density polyethylene (HDPE) film
2 replacement membranes, installation tools and electrolytes are included
Other maintenance parts are in the convenience Kit (see ordering information)
Dissolved oxygen DO sensor millivolt output and built-in 4-20mA output are available in the saturation range of 0-100% and 0-200%

Underwater electro dissolved oxygen sensor amt-pr300, characteristics:
It contains a large capacity electrolytic cell to support long-term stable work;
Models with / without temperature sensor;
Easy to install and maintain
Including millivolt and 4-20mA output;
It is very suitable for aquaculture and wastewater monitoring applications;
Cloud borne IOT dissolved oxygen sensor atm-w400
Amt-w400 multi parameter water quality electrode can be freely combined and installed with 2-7 water quality sensors
The monitoring factors include: temperature, pH, ORP, conductivity, salinity, total dissolved solids, dissolved oxygen, turbidity, chlorophyll a, blue-green algae, rhodamine, oil in water, ammonia nitrogen, depth, etc
RS485 interface and standard Modbus protocol are adopted, with low power consumption, built-in battery and solar power supply
Amt-w400 uses electrodes with better performance and longer service life
It has the functions of data analysis, calibration and random sending

AMT series multi parameter water quality monitor is used for on-line monitoring and portable monitoring of surface water, drinking water, municipal sewage, industrial wastewater, groundwater, ocean and other different water bodies, which is convenient for integrated applications such as monitoring buoy, monitoring floating discharge and monitoring ship

Technical features
■  High reliability: suitable for long-term work in the field environment, with stable measurement and strong anti-interference ability
■  Flexible and portable: each probe can be combined freely, replaced independently, plug and play, and can be operated remotely
■  Scalability: monitor multiple factors and install 7 sensors at the same time
■  Various applications: long-term online work, on-site rapid measurement, emergency monitoring, groundwater monitoring, self-contained battery
■  Water resistant, PVC shell: 200 meters, water resistant
■  Compact structure: 76mm in diameter, can be installed in smaller occasions