A reliable ISO direct manufacturer with CE ROHS certificate.     Please contact    WaterAnalyzer@probesti.com  WaterMonitor@probesti.com    Probest@Probest.cn

FAQ

  • 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 Why Probest is with so many 10+ years colleagues?

    A
    Why we are happy to be a member of Probest Water Monitoring Sensors Factory?

    1. Because our team is united, we have a pretty good atmosphere.
     
    2. Because our boss is thinking about us and treating us like family. Probest is warm team.

    3. Because we always have the opportunity to learn so we can always grow.

    .......
    As we are enjoying our work, enjoying our life!
  • Q How does your company PROBEST ensure quality?

    A
    PROBEST strictly according to the following processes for each product produced by the company for quality control:
     
    First, ISO whole process quality control system, 6S management system
     
    1). Supply Chain Management
    Implementation of supplier certification system
    Dual-source supply strategy for key components
    Raw material batch traceability system
     
    2)Production process control
    A[Incoming Material Inspection] --> B[Process Inspection] --> C[SPC for Key Workstation] --> D[Aging Test] --> E[Final Inspection OQC].
    Establish quality gate control points (IQC/PQC/OQC)
    CPK requirements for key processes
    Implementation of “three inspection system” (self-inspection / mutual inspection / special inspection)
    Laboratory Assurance
    Regular calibration of testing equipment (MSA analysis)
    Retain all test raw data in ERP series
    All can be traced with SN
     
    Second, certification and standards compliance
    Mandatory certification: CE
    Enterprise standards industry standards: ISO (water quality instruments)
     
    Third, quality data visualization
    Establish real-time quality Kanban:
     
    Fourth, Continuous Improvement Mechanism
    PDCA cycle
     
    Fifth, Monthly quality analysis meeting
    8D report response time ≤72 hours
    Corrective action verification rate 100%
    Customer participation in improvement
    Establishment of customer quality committee
     
    Sixth, Integrity safeguard measures
    Welcome to the site random, sampling, monitoring
     
  • Q Quality control

    A
    We are proud to announce that PROBEST has successfully achieved all 2025 business goals! With strong momentum, we have officially kicked off the journey toward our 2026 strategic objectives.
     
    Quality is the cornerstone of PROBEST's development. We implement a full-cycle quality control system covering every critical stage:
     
    • Incoming Material Inspection: We strictly screen high-quality raw materials, rejecting non-conforming inputs to lay a solid foundation for superior products.
    • In-process Quality Assurance: We conduct real-time monitoring and strict testing during production, ensuring every manufacturing step complies with our rigorous standards.
    • Pre-shipment Verification: Before delivery, all products undergo comprehensive inspection and testing to guarantee they meet customer requirements and industry benchmarks.
     
    Our pricing is based on high-quality raw materials and strict quality control. Compared with cheaper alternatives, our products ensure better durability and performance, which helps you reduce after-sales issues.
     
    We sincerely wish all our partners continued success, prosperity and all-round growth in the new year. Let’s join hands to plant the seeds of cooperation and harvest fruitful results together!
  • Q What are your contract principles? Does it support a long-term win-win cooperation model?

    A We PROBEST always adhere to the contractual principle of *"Fair and Mutual Benefit, Long-term Win-Win ”*.

    Whether as a supplier or a buyer, we are committed to building a transparent and balanced partnership to ensure that the interests of both parties are maximized.
  • 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 What does the Environmental Association do?

    A What does the Environmental Association do?

    As an authoritative certification service organization, the Environmental Association is always committed to providing professional and comprehensive certification services for enterprises. The scope of its audit is not only limited to quality management system, but also covers a wide range of fields such as environmental management, occupational health and safety, information security, etc., aiming to assess the comprehensive strength and compliance of enterprises in an all-round way.
    The strict audit by the Environmental Association further confirmed the reliability of PROBEST's factory in production management, quality control and compliance operation, especially in the field of research and development and production of water quality analyzers, PROBEST has shown excellent technical strength and rigorous production attitude, which fully reflects its professionalism as a high-quality production enterprise.
  • Q Why choose Probest a Direct Factory as Long-term Partner?

    A

    Choosing a factory as a long-term partner over a trader company can offer several advantages, especially if you are a professional sourcing agent. Here are some key reasons why you might prefer a factory:

    1. Cost Efficiency

    • Lower Costs: Factories typically offer lower prices because you are buying directly from the manufacturer, eliminating the middleman (trader) markup.

    • Transparent Pricing: You can often negotiate better terms and understand the cost structure more clearly when dealing directly with a factory.
       

    2. Quality Control

    • Direct Oversight: Working directly with a factory allows you to have more control over the production process, ensuring that quality standards are met.

    • Customization: Factories are usually more flexible when it comes to customizing products to meet specific requirements.
       

    3. Production Capacity

    • Scalability: Factories generally have the capacity to scale production up or down based on your needs, which is crucial for long-term partnerships.

    • Consistency: Direct access to the production line ensures that you can maintain consistent quality and supply over time.
       

    4. Communication and Relationship Building

    • Direct Communication: Dealing directly with the factory reduces the risk of miscommunication and allows for quicker resolution of issues.

    • Stronger Relationships: Building a direct relationship with the factory can lead to better cooperation, trust, and long-term collaboration.
       

    5. Innovation and Development

    • R&D Collaboration: Factories often have R&D departments that you can collaborate with to develop new products or improve existing ones.

    • Technological Advancements: Factories are usually at the forefront of technological advancements in their field, which can be beneficial for your product line.
       

    6. Supply Chain Control

    • Transparency: You have better visibility into the supply chain, which can help in managing risks and ensuring timely delivery.

    • Logistics: Direct coordination with the factory can streamline logistics and reduce lead times.
       

    7. Compliance and Certifications

    • Regulatory Compliance: Factories are more likely to have the necessary certifications and comply with industry standards, which is crucial for certain markets.

    • Ethical Standards: Direct oversight ensures that ethical and environmental standards are met, which is increasingly important to consumers.
       

    8. Long-Term Strategic Partnership

    • Joint Growth: A long-term partnership with a factory can lead to joint growth opportunities, such as co-branding or exclusive product lines.

    • Stability: Factories are generally more stable and reliable partners compared to traders, who may switch suppliers frequently.
       

    9. Risk Management

    • Lower Risk: Dealing directly with a factory reduces the risk of fraud or misrepresentation, which can be higher with traders.

    • Contingency Planning: Factories are better equipped to handle disruptions and can work with you to develop contingency plans.
       

    10. Intellectual Property Protection

    • Confidentiality: Factories are often more willing to sign non-disclosure agreements (NDAs) and protect your intellectual property.

    • Control: You have more control over the production process, reducing the risk of your designs or technologies being copied.

      That's why we need to find a factory as our partner, Probest is your best choice for water monitoring analyzer. We can also offer fast delivery, fast team service and quality control. Contact PROBEST. 

  • 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 How to find a reliable long-term cooperation partner?

    A Building trust over time by consistently meeting obligations, being transparent, and showing commitment. Trust isn't built overnight, so patience is necessary. 

    To find a reliable long-term cooperation partner, follow this structured approach:
     
    1. Define our Needs and Values
    Clarify Objectives: Identify our business goals, required resources, and the specific skills we seek in a partner.
     
    Align Values: Prioritize partners who share your core values (e.g., integrity, innovation) to ensure cultural compatibility.
     
    2. Source Potential Partners
    Networking: Attend industry events, via google, via LinkedIn. Visit website. 
     
    Referrals: Seek recommendations from trusted contacts to pre-vet candidates.
     
    Industry Presence: Target organizations with strong reputations and thought leadership in your field.
     
    3. Vet Candidates Thoroughly
    Track Record: Review case studies, client testimonials, and past collaborations. Google, linkedIn are the best way to audit. 

    Probest is a direct factory, Believe in karma and credit first! Contact us.
  • 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 About PROBEST product lead time

    A
    Q:About PROBEST product lead time?
     
    A: Conventional moisture meters in small quantities, PROBEST will have rolling stock, but the products are 100% tested into the warehouse, and will be tested and calibrated again, and packaged before shipment. So the regular is 2-10 days. Please provide inventory verification.
    As Probest is the first-hand first-source direct water analyzer monitoring machines maker. Welcome to have online zoom meeting or visit onsite. 
     

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