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  • Q Portable Lab Meter Selection PMI800 series

    A For digital portable sensor, PROBEST currently has PH, ORP, DO, turbidity, SS, chlorophyll, blue-green algae, COD. 
    For single-channel portable mainframe can choose digital sensors (DO, turbidity, SS, chlorophyll, blue-green algae) & analog PH, ORP

    PMI800 when used with portable electrodes, the PMI800 portable analyzer can measure a variety of parameters such as pH, ORP, Conductivity (convertible Salinity & TDS), Dissolved oxygen, Turbidity, Suspended solids, Chlorophyll, Blue-green algae, COD ect. The connected electrode type can be automatically identified, single channel and dual
    channel configurations are available.

    It has the advantages of comfortable operation, convenient testing and wide application.


     

  • Q Does every colorimetric meter PCM200 series have to be pre-processed?

    A If the water quality is relatively simple, clean, can not be equipped with pre-treatment.
    When the water samples in the chromaticity, turbidity, suspended solids, oil and grease concentration is too large, it is recommended that the instrument should be appropriate pretreatment.

  • Q PROBEST's PTU-800 turbidity sensor and PTU-600 turbidity sensor differences

    A
    Q：PROBEST's PTU-800 turbidity sensor and PTU-600 turbidity sensor differences
     
    A: There is a difference in size, PTU-600 sensor size is smaller, and the top of the sensor has a thread;
       PTU-800 turbidity analyzer range can be selected, materials can be selected; accuracy, repeatability, resolution is better!

  • Q Can PROBEST sensors add or cut wires?

    A
    Q: Can PROBEST sensors add or cut wires?
     
    A: Digital sensors can be cut to extend or shorten the cable, but analog sensors cannot be cut (PH-500, POP-500, PEC-500, PDCL-400). Please confirm the required cable length when placing an order, so as to ensure no leakage and data transmission.

  • Q PCM200-CODcr Chemical Oxygen Demand (CODcr) Water Quality Online Monitor

    A yes Question: What is the test method of the PCM200-CODcr Chemical Oxygen Demand (CODcr) Water Quality Online Monitor?

    Answer:  The dichromate process. Under certain conditions, the mixed solution of potassium dichromate and sulfuric acid is added to the water sample, and the reaction is carried out in the digestion tank, so that the organic reducing matter in the water sample is oxidized. In the reaction, Cr6+ is reduced to Cr3+, which causes the color change of the mixed solution. The color change of the mixed sample is detected by photoelectric colorimeter, and finally converted into the content of oxygen required by the redox reaction, which is the chemical oxygen demand of the water sample under test.

    yes Question: What is the typical application?

    Answer:  On-line monitoring of municipal sewage inlet and outlet
                   On-line monitoring of pollution source outlet
                   On-line monitoring of industrial wastewater outlet.


  • Q Is there any 24V DC or 230V AC transmitter for PROBEST transmitters?

    A
    PROBEST's UNI-20, DXC-20, MUC-200 controllers are available in a special DC version that supports a wide range of voltages from 9-36VDC, with -1 added to the order number, and also in an AC version that is a wide range of voltages from 85-500VAC.

    Be sure to check whether DC or AC is required on site when placing an order.

  • Q If UNI-20, DXC-20, MUC-200 controller connected to the UVCOD can display COD, BOD, TOC values at the same time

    A
    If you want to display BOD, TOC value, when connected with PROBEST controller (transmitter) UNI-20, DXC-20, MUC-200 need to be noted in the order, can be set in the second interface display, but can not be displayed in the same interface.

  • Q Our UVCOD PUVCOD-900 PUVCOD-600 COD BOD TOC Water Analyzers Applicable Environment

    A
    Our UVCOD PUVCOD-900 PUVCOD-600 COD BOD TOC Water Analyzers, UV method is applicable to water containing organic pollutants of aromatic hydrocarbons or benzene rings, pH between 4.5 and 9, and water samples containing organic pollutants of aromatic hydrocarbons or benzene rings with stable composition.

  • Q Difference between colorimetric residual chlorine CL-201 and constant pressure residual chlorine CL-400

    A
    The principle is different, the colorimetric method CL-201 is more accurate, and the constant pressure method CL-400 mainly measures the trend. 
     

  • Q PTU-800 turbidity and PTU-600 turbidity sensor difference

    A
    There is a difference in size, PTU-600 size is smaller, and the top of the sensor has a thread;
     
    PTU-800 range can be selected, materials can be selected; accuracy, repeatability, resolution is better!

    For them also have with or without brusher for your choice to meet customers different budget need. 

  • Q Can the PROBEST sensors extend or cut wires (cables)?

    A Digital sensors are able to cut wires to extend or shorten the cable, analog sensors can not cut wires (PH-500, POP-500, PEC-500, PDCL-400).

  • Q Can ion chlorine be measured by residual chlorine or total chlorine?

    A
    Couldnt, the residual chlorine is measured by hypochlorous acid and hypochlorite; chloride ion is usually measured by ion-selective method in the market. So could choose our PISE-900 with ion chlorine. 

    https://probesti.com/ammonia-nitrogen-nh4-nitrate-no3n-potassium-ion-k-chloride-cl-fluoride-f-ion-water-analyzer-sensors.html

  • Q What are the methods of color measurement?

    A The color measurement methods are platinum-cobalt color measurement method and dilution multiple method (GB 11903-1989). The two methods should be used independently, and there is generally no comparability between the measured results. The platinum-cobalt color measurement method is suitable for the determination of clean water, slightly polluted water and slightly yellow water, as well as cleaner surface water, groundwater, drinking water and reclaimed water, wastewater after advanced treatment, etc. The dilution multiple method is usually used to determine the Chroma of industrial wastewater and surface water with serious pollution.

    The platinum-cobalt color measurement method is a standard unit of chromaticity, commonly known as 1 degree, when 1L water contains 1mg Pt (IV) and 2mg cobalt chloride (II) Hexahydrate. A standard Chroma unit is prepared by adding 0.491 mg K2PtCl6 and 2.00 mg CoCl2_6H 2O to 1L water, also known as the platinum-cobalt standard. Standard chromaticity units can be obtained by adding standard platinum-cobalt reagents several times. Owing to the high price of potassium cobalt chloride, K2Cr2O7 and CoSO4_7H2O are usually used to prepare standard solution of alternative Chroma according to certain proportion and operation steps. When measuring the Chroma, the Chroma of the water sample can be obtained by comparing the water sample to a series of standard liquids with different Chroma.

    The dilution multiple method is to dilute the water sample with optical pure water to nearly colorless and then move it into the colorimetric tube. Under the white background, the color of the water sample is darker than that of optical pure water with the same liquid column height. If the difference is found, dilution is carried out until the color can not be detected. At this time, the dilution multiple of the water sample is the value expressing the color intensity of the water, and its unit is double.

    https://probesti.com/china-wholesale-manufacturer-real-time-digitlal-color-water-quality-test-monitoring-instruments-sensors-and-meters-for-color-measurement-for-drinking-water.html

  • Q What is the Chroma of Water?

    A The Chroma of water is the standard when measuring the color of water.
    The Chroma in water quality analysis usually refers to the true color of water, that is, the color produced by soluble substances in water samples. Therefore, before determination, water samples need to be clarified, centrifuged or filtered with 0.45 um filter membrane to remove SS, but not with filter paper, because the filter paper can absorb part of the color of water.

    The result of the determination of the original sample without filtration or centrifugation separation is the apparent color of water, that is, the color produced by both soluble and insoluble suspended substances. In general, the apparent color of water can not be measured and quantified by platinum-cobalt color measurement. Usually, the characters such as shade, tone and transparency can be described by words, and then determined by dilution multiple method. The results measured by platinum-cobalt color measurement and the Chroma values measured by dilution multiples are often not comparable.

    https://probesti.com/china-wholesale-manufacturer-real-time-digitlal-color-water-quality-test-monitoring-instruments-sensors-and-meters-for-color-measurement-for-drinking-water.html

  • Q PROBEST Small Water Talk - What is chemical oxygen demand?

    A In the water treatment industry, we often hear COD, which refers to the amount of oxygen required by organic substances in water. The COD in water is mainly from human and animal excretion, industrial wastewater, agricultural fertilizers ect. The level of COD can reflect the concentration of organic matter in the water to determine if the water quality meets the standard.
    I have this PROBEST COD online analyzer series, with a variety of advantages, to meet all your needs!
     
    First, convenient, PROBEST probe direct immersion measurement, no sampling and pre-process, short response time, can achieve continuous measurement. The sensor's built-in cleaning function reduces maintenance.
     
    Second, environmental protection, in the measurement process does not require chemical reagents, will not cause second pollution!
     
    Third, the measurement range is wide, with xenon lamp light source penetration is strong, in the case of high suspended matter, the light source can still penetrate, to achieve the max. measurement range of 0 ~ 2000mg/l. PROBEST PUVCOD-900 could meet your requirements. We also have other model other ranges for your choice. 
     
    Fourth, the inclusion of turbidity compensation, which can eliminate turbidity interference to a certain extent and ensure the accuracy of the measurement value.
     
    Fifth, with solid state calibrator and corresponding software functions, it can realize rapid product calibration without standard liquid.
     
    The sensor is suitable for continuous monitoring of organic matter in sewage treatment process, online real-time monitoring of water quality in and out of sewage plants, and continuous online monitoring of surface water, industrial sewage discharge and fishery sewage discharge.
     
    COD is an important to measure the concentration of organic matter in water, which is of great significance to protect water environment and maintain ecological balance. Hope you pay attention to COD and join protect our water environment.
     

  • Q Drinking Water Turbidity Monitoring

    A
    Measuring Turbidity
     
    Turbidity is typically measured using a turbidimeter, which quantifies the amount of light scattered by particles in the water. The unit of measurement is called a 'nephelometric turbidity unit' (NTU). Lower NTU values indicate clearer water, while higher values indicate cloudier water.
     
    Regulations and Guidelines
     
    To maintain safe and clean water, regulatory agencies such as the Environmental Protection Agency (EPA) have set guidelines for acceptable turbidity levels in drinking water. These guidelines ensure that water treatment facilities adhere to specific standards to provide the public with safe drinking water.
     
    Impact on Drinking Water Treatment
     
    Turbidity directly affects the efficiency of water treatment processes. High turbidity levels can overwhelm treatment systems, leading to inadequate removal of contaminants. Thus, controlling turbidity is crucial to ensuring the effectiveness of water treatment methods.
     
    How to Reduce Turbidity
     
    Reducing turbidity involves a combination of preventive measures and appropriate land use practices. Some effective strategies include:
     
    Buffer Zones: Implementing buffer zones near water bodies can reduce soil erosion and sediment runoff, consequently lowering turbidity levels.
     
    Sediment Basins: Constructing sediment basins in construction sites can capture sediment-laden runoff before it reaches water bodies.
     
    Riparian Vegetation: Planting native vegetation along riverbanks stabilizes soil and reduces sediment runoff.
     
    FAQs
     
    Is turbidity solely caused by human activities?
     
    Turbidity can result from both natural processes and human activities. Natural sources include erosion, while human activities like construction, mining, and agriculture can significantly contribute to elevated turbidity levels.
     
    Can high turbidity lead to health issues?
     
    Yes, high turbidity levels can indicate the presence of harmful microorganisms and pollutants. Consuming water with high turbidity can lead to gastrointestinal issues and other health problems.
     
    How does turbidity impact underwater life?
     
    Turbidity can disrupt aquatic ecosystems by blocking sunlight needed for photosynthesis. This affects the growth of aquatic plants and, consequently, the entire aquatic food chain.
     
    Are there any immediate visible signs of high turbidity?
     
    Water with high turbidity often appears murky or cloudy. In extreme cases, it might have a distinct color due to suspended particles.
     
    What role does turbidity play in water treatment?
     
    Turbidity affects the efficiency of water treatment processes. High turbidity can overwhelm treatment systems, leading to inadequate removal of contaminants and impurities.
     
    How can I measure turbidity at home?
     
    While not as accurate as professional equipment, you can measure turbidity at home using simple DIY methods like the 'Secchi disk.' This involves lowering a marked disk into the water until it disappears from view, and then measuring the depth at which it vanishes to gauge turbidity.
     
    Conclusion
     
    Turbidity water quality serves as a vital metric for assessing the cleanliness and safety of water bodies. Its impact on water potability, aquatic ecosystems, and treatment processes underscores its significance in maintaining the health of both humans and the environment. By understanding turbidity and taking measures to reduce it, we can ensure the availability of clean and safe water for generations to come.
     
    What instruments are good for drinking-water turbidity monitoring? 
    PLTU-700 PLTU-600 Low range turbidity monitoring for drinking-water.

  • Q What is turbidity and why is it important?

    A
    Turbidity is a measure of water clarity how much the material suspended in water decreases the passage of light through the water. Suspended materials include soil particles (clay, silt, and sand), algae, plankton, microbes, and other substances. These materials are typically in the size range of 0.004 mm (clay) to 1.0 mm (sand). Turbidity can affect the color of the water.
     
    Higher turbidity increases water temperatures because suspended particles absorb more heat. This, in turn, reduces the concentration of dissolved oxygen (DO) because warm water holds less DO than cold. Higher turbidity also reduces the amount of light penetrating the water, which reduces photosynthesis and the production of DO. 

    Sampling and equipment considerations
    Turbidity can be useful as an indicator of the effects of runoff from construction, agricultural practices, logging activity, discharges, and other sources. Turbidity often increases sharply during a rainfall, especially in developed watersheds, which typically have relatively high proportions of impervious surfaces. The flow of stormwater runoff from impervious surfaces rapidly increases stream velocity, which increases the erosion rates of streambanks and channels. Turbidity can also rise sharply during dry weather if earth-disturbing activities are occurring in or near a stream without erosion control practices in place.

    Regular monitoring of turbidity can help detect trends that might indicate increasing erosion in developing watersheds. However, turbidity is closely related to stream flow and velocity and should be correlated with these factors. Comparisons of the change in turbidity over time, therefore, should be made at the same point at the same flow.
     
    A turbidity meter consists of a light source that illuminates a water sample and a photoelectric cell that measures the intensity of light scattered at a 90 angle by the particles in the sample. It measures turbidity in nephelometric turbidity units or NTUs. Meters can measure turbidity over a wide range from 0 to 1000 NTUs. A clear mountain stream might have a turbidity of around 1 NTU, whereas a large river like the Mississippi might have a dry-weather turbidity of around 10 NTUs. These values can jump into hundreds of NTU during runoff events. Therefore, the turbidity meter to be used should be reliable over the range in which you will be working.  Probest PTU-800 turbidity meters could be for the range 4000NTUs. 


     

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