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  • Q What is the Water analysis Monitoring instruments

    A
    Water analysis monitoring instruments, also known as water quality testing equipment or meters, are used to assess water quality by measuring various parameters such as pH, dissolved oxygen, conductivity, turbidity, COD, and concentrations of different chemicals and contaminants

    These sophisticated instruments are designed to measure physical, chemical, and biological parameters of water.

     Water quality analyzers are sophisticated instruments designed to measure various parameters in water, providing insights into its purity and safety. 
     

  • Q What's the difference between DXC20 & UNI20 water transmitter

    A As to DXC20 & UNI20 water transmitters, both are with dual channels and signle channels for your choice. 

    With the same function, Single or Dual-channel transmitter, measured parameters include PH, DO, ORP, conductivity, turbidity, SS, chlorophyll, blue-green algae and other parameters. And realize the plug and play of the
    sensor, the configuration is flexible and convenient.
    Both with the same Features
    Achieve plug and play of sensors, quick and convenient electrode installation and replacement.
    Simple to use, reliable results, interface operation instructions can reduce operation errors.
    LCD screen visual operation, with Chinese and English bilingual navigation menu, rich and comprehensive interface content.
    With 4 ~ 20mA, MODBUS RS485 multiple data output methods.
    Automatically prompt error and alarm information, and realize the upload of alarm signal.
    The transmitter supports wall-mounted installation/panel installation/ pinch tube installation.
    Existing time display, data storage and historical data viewing functions.
    Optional data wireless transmission module.

    Diffence:
    DXC20 is neutral type for OEM, ODM. 
    UNI20 is with PROBEST logo, for our distributors. 

  • Q Does calibrating the pH electrode ensure accurate measurements?

    A Yes, to ensure accurate and precise pH measurements, in-line pH electrodes require regular calibration intervals that are dependent on the process conditions.

    A typical two-point calibration should be performed every two weeks using pH 4.01 and pH 7.00 technical buffers from Probest.

    The results of the calibration provide valuable information about the electrode’s health. The slope and offset values are then used to adjust the electrode for precise pH measurement until the next calibration is due.

  • Q What is the lifespan of a pH electrode?

    A
    Since pH is very much related to the place of use, pH electrodes are marketed as wearing parts without warranty.
     
    At the same time, the service life of in-line pH electrodes is largely dependent on the process conditions. pH electrodes have a service life ranging from a few days to more than a year without degradation of performance.

    However, exposure to highly alkaline process conditions and extreme temperatures can shorten the life of the electrode.

    We are pleased that the pH we sell at PROBEST, customer feedback has been used for over 6 years and is still good, my feedback has been used for over 2 years and is still good.
    Be sure to tell the APPLICATION of use and choose the right PH electrode.

  • Q How does a pH electrodes work?

    A A pH electrode works by measuring the difference in electric potential in mV between a glass membrane or X-Chip and the reference electrode in a solution.

    pH electrodes work by measuring the potential difference in mV between a glass membrane or X-chip and a reference electrode in a solution.
     
    The pH-sensitive portion of the electrode detects the activity of the hydrogen ions at its tip. The silver/silver chloride reference electrode is in contact with the solution through a septum or open junction, providing a stable reference potential. The pH value is then calculated from the potential difference using the calibration parameters of the pH sensor (stored on the sensor for digital ISM sensors and on the transmitter for analog pH sensors).

    Trust PROBEST chanagable PPH-500B ph online Sensor (Changable type) is your best choice for some cases. 
    And we also have other types for your choice, for the complex industry, also for the pure water test. 
     

  • Q What is the range of the PROBEST PUVCOD-900 instrument?

    A PROBEST PUVCOD-900 instrument has three different ranges base on different optical paths for your choice:

     COD (using KHP calibration)：
    0~2000mg/l COD (2mm)
    0~1000mg/l COD (5mm)
    0~90mg/l COD (50mm)

  • Q What are the choices of materials for the contact parts of the PUVCOD instrument? Are they corrosion resistant?

    A
    We offer a variety of material configurations to suit different water quality environments for the PUVCOD-900. 
     
    Housing 316L stainless steel (standard), titanium alloy (high salt/strong acid environments) for salty-water. 

  • Q Is the PUVCOD tester optical type? What is its measuring principle?

    A Yes. PUVCOD is optical type. Optical measurements require no reagents and are easier to maintain, making them suitable for long-term online monitoring.

    Based on the UV absorption reaction by organic matter, the PUVCOD-900 Spectromete Organic  On-Line Analyzer uses the 254 nm spectral absorption coefficient SAC254 to measure the content of soluble organic compound in the water, and it can be converted to COD or BOD values under certain conditions. This method allows continuous monitoring without any reagents.

  • Q How to monitor COD? What is the Role of Water Quality Instruments?

    A

    Water quality instruments are automated devices that continuously monitor Chemical Oxygen Demand (CODmn), a measure of organic pollution in water. They use advanced techniques like UV absorption or laser spectroscopy to estimate CODmn, providing real-time data for industrial or environmental monitoring.
    These instruments are precise and reduce manual labor, making them suitable for settings like wastewater treatment plants. However, they are costly and require regular maintenance.

    For example, the COD analyzer by PROBEST offers constant online measurement, supporting wastewater treatment monitoring.

    How Do Colorimetric and Titration Methods Measure CODmn?

    Colorimetric Method: This involves reacting a water sample with potassium permanganate (KMnO4). After the reaction, the color intensity of the remaining KMnO4 is measured using a spectrophotometer, determining the CODmn from the color change. It's simple and quick but can be less accurate due to interference from the sample's color or turbidity, as noted in a study using N,N-diethyl-p-phenylenediamine for measurement.

    Titration Method: Here, the water sample is reacted with KMnO4, and the remaining KMnO4 is titrated with a standard reducing agent, like sodium oxalate, to calculate the amount consumed, reflecting CODmn. This method is highly precise but time-consuming and requires skilled operators, as described in standard methods.

    What Are the Differences Between These Methods?

    These methods differ in automation, precision, speed, and suitable scenarios:

    Automation vs. Manual Operation: Water quality instruments are automated, ideal for continuous monitoring, while colorimetric and titration methods are manual, requiring laboratory setup.

    Precision: Titration offers the highest precision, water quality instruments provide good accuracy depending on technology, and colorimetric is less precise due to potential interferences.

    Speed: Instruments deliver the fastest results, colorimetric is quicker than titration but still needs preparation, and titration is the slowest.

    Suitable Scenarios: Instruments are best for real-time industrial or environmental monitoring, colorimetric suits routine lab testing where speed matters, and titration is used in research or regulatory compliance needing high precision.

  • Q Detailed product knowledge about water quality analyzer

    A
    Water quality analyzer is a kind of equipment used to monitor and measure various chemical and physical parameters in water, which is widely used in many fields, such as environmental protection, water treatment, water industry and so on. The following is the detailed product knowledge about water quality analyzer:
     
    Classification and function
    Water quality analyzer is divided into multi-parameter tester MP301 MUC200 and single-parameter tester according to its function. Multi-parameter analyzer can simultaneously measure a variety of water quality parameters, such as pH, dissolved oxygen, conductivity, turbidity, etc., while the single-parameter analyzer focuses on a single parameter measurement. 
    As to parameters, such as the Dissolved Oxygen Meters, Do Sensor, UVCOD BOD sensors, NH4H Sensor, Turbidity Sensor, Residual Chlorine Analyzer, Total Chlorine Analyzer, Turbidity Meter, TP, TN ect..

  • Q What applications can PROBEST's water quality analyzers be used for?

    A
    Water Monitoring Analysis Applications:

    Water source monitoring: to ensure the safety of drinking water
     
    Environmental protection monitoring station: monitoring environmental water quality
     
    Municipal water treatment process: monitor water quality treatment effectiveness
     
    Municipal water quality monitoring: ensuring the quality of water supply
     
    Rural tap water monitoring: ensuring rural drinking water safety
     
    Circulating cooling water management: widely used in industrial cooling systems
     
    Swimming pool water management: ensuring water safety in swimming places
     
    Factory aquaculture: monitoring water quality to optimize the aquaculture environment, etc.

  • Q What is the minimum number of parameters that can be connected to the MP301? What is the maximum number of sensors that can be connected? What additional parameters can be added?

    A At least one sensor can be connected individually. The maximum number of sensors that can be connected to the MP301 is 6. It can also display the temperature and add pressure sensors.
    Max is 6sensors+pressure+temp. could be connected, please help check what parameters do you need?
    When choose Mp301, please kindly also let us know for saltywater or freshwater monitoring?

    MP301 multi-parameter online analyzer: suitable for long-term on-line online monitoring, measuring up to 8 parameters simultaneously, including: Temperature, Depth, pH, ORP, Conductivity & Salinity & TDS, Turbidity, DO, Chlorophyll, Blue-green algae, Ammonia nitrogen, Nitrate, Chloride, Fluoride. Optional accessories such as bluetooth module, battery pack, and handheld communicator are also available for easy portable measurement.

    Application
    Multi-Parameter water quality online monitoring of rivers, lakes and reservoirs.
    Water quality online monitoring of drinking water source, ground water and sea water.
     

  • 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.

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