Modularized water quality multi-parameter detector
Through modular design and temperature compensation technology, the problems of difficult maintenance, poor flexibility and low reliability of traditional water quality testing instruments have been solved, achieving portability, ease of operation and high-precision measurement, and making it suitable for multiple applications in the field and laboratory.
Patent Information
- Application Number
- CN202511470339.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-15
- Publication Date
- 2026-02-24
AI Technical Summary
Traditional water quality testing instruments are difficult to maintain, lack flexibility, have low reliability, and are inconvenient to temperature compensation, which affects measurement accuracy and continuity of use.
It adopts a modular design, with a replaceable probe compartment, an integrated temperature sensor for automatic compensation, shielded cables and signal conditioning circuits, and intelligent display and communication interface to achieve convenient maintenance and high-precision measurement.
It improves the portability and ease of operation of the equipment, ensures the accuracy and reliability of measurement results, reduces maintenance and usage costs, and is suitable for multiple applications in the field and laboratory.
Smart Images
Figure CN121558091A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of water quality monitoring technology, specifically to a modular water quality multi-parameter analyzer. Background Technology
[0002] Water quality testing is a crucial step in environmental monitoring, aquaculture, wastewater treatment, and scientific research. pH value, dissolved oxygen concentration, and water temperature are the most basic and important parameters for assessing water quality. Currently, various water quality testing devices are available on the market, which can be mainly divided into single-parameter analyzers and multi-parameter analyzers based on their functions.
[0003] Traditional multi-functional water quality analyzers mostly adopt an integrated or fixed integrated design, combining multiple sensors into a single probe or main unit. These devices have the following significant drawbacks:
[0004] (1) Difficult to maintain: When a sensor (such as a pH sensor or dissolved oxygen sensor) is damaged or needs to be calibrated, the entire probe or main unit often needs to be sent back to the manufacturer for repair. The process is cumbersome, time-consuming and costly, affecting the continuity of use.
[0005] (2) Poor flexibility: Its sensor configuration is fixed, and users cannot flexibly replace or add different detection modules according to actual monitoring needs, resulting in insufficient functional expandability.
[0006] (3) Reliability issues: Water quality sensors are susceptible to contamination, aging, or damage in complex aquatic environments. The integrated design means that a local failure can paralyze the entire device, resulting in low reliability. At the same time, sensor signals are easily interfered with during transmission, affecting measurement accuracy.
[0007] (4) Inconvenient temperature compensation: The measured values of pH and dissolved oxygen are significantly affected by water temperature and require real-time temperature compensation. Many devices do not integrate temperature sensors or have imperfect compensation mechanisms, resulting in deviations in measurement results under different water temperature environments. Summary of the Invention
[0008] The purpose of this invention is to provide a modular water quality multi-parameter analyzer. The modular design improves the maintainability and expandability of the equipment, and the integration of multi-parameter sensors and temperature compensation functions ensures the accuracy and convenience of measurement. The overall structure is reasonably designed and easy to carry and operate in the field.
[0009] To achieve the above objectives, the present invention is implemented through the following technical solution: a modular water quality multi-parameter detector, including a housing, a display screen on the end face of the housing, a group of function buttons on the end face of the housing, a status indicator light on the end face of the housing, a probe compartment 1 at the front end of the housing, a probe cable 1 at the front end of the probe compartment 1, a probe 1 at the front end of the probe cable 1, a probe compartment 2 at the front end of the housing, a probe cable 2 at the front end of the probe compartment 2, and a probe 2 at the front end of the probe cable 2.
[0010] Furthermore, the left side of the housing is provided with a card slot, the end face of the card slot is provided with a handle, the right side of the housing is provided with a communication interface group, and the rear end of the housing is provided with a charging interface.
[0011] Furthermore, the inner end of the housing is provided with a main control circuit board, the end face of the main control circuit board is provided with a signal conditioning circuit, the end face of the main control circuit board is provided with a data storage chip, the end face of the main control circuit board is provided with a power management module, and the inner end of the housing is provided with a rechargeable lithium battery.
[0012] Furthermore, a pH sensor unit is provided at the inner end of probe chamber one, a dissolved oxygen sensor unit is provided at the inner end of probe chamber two, and a temperature sensor is provided at the inner ends of probe one and probe two. The temperature sensor is integrated into probe one and probe two and is used to simultaneously measure water temperature and compensate for pH and dissolved oxygen measurements.
[0013] Furthermore, probe one is electrically connected to the main control circuit board via probe cable one, and probe two is electrically connected to the main control circuit board via probe cable two.
[0014] Furthermore, the display screen is electrically connected to the main control circuit board. The display screen is configured in a split-screen display mode, simultaneously displaying pH value, dissolved oxygen concentration, and water temperature data for displaying measurement data. The function button group and status indicator lights are electrically connected to the main control circuit board. The status indicator lights are configured to display power status and data transmission status. The communication interface group is used to transmit measurement data to external devices.
[0015] Furthermore, the communication interface group and the charging interface are electrically connected to the main control circuit board, and the power management module is electrically connected to the rechargeable lithium battery and the charging interface for managing power distribution and charging. The power management module is configured to monitor the power level of the rechargeable lithium battery and provide a low power warning through a status indicator light.
[0016] Furthermore, the probe compartment one and probe compartment two are configured as replaceable modular units to facilitate the maintenance or replacement of sensors. The probe compartment one and probe compartment two are connected to the housing via plug-in connectors for quick replacement and maintenance. The signal conditioning circuit is used to amplify and filter the signals collected by the probe one and probe two.
[0017] Furthermore, the water temperature data measured by the temperature sensor is used simultaneously for measurement compensation of both the pH sensor unit and the dissolved oxygen sensor unit.
[0018] Furthermore, both probe cable one and probe cable two are shielded cables to reduce signal interference.
[0019] This invention provides a modular water quality multi-parameter analyzer, which has the following beneficial effects:
[0020] 1. Superior portability and integrated design greatly improve the efficiency of field operations: Traditional water quality testing equipment often consists of multiple independent main units and probes, which are inconvenient to carry and cumbersome to connect. This patented instrument highly integrates the display screen, function button group, main control circuit, power supply, and multiple probe compartments into a single housing, forming a complete portable workstation. In particular, the slot and handle design described in claim 2 makes the device easy to grip and carry, making it ideal for mobile field monitoring, on-site emergency testing, and other scenarios. This integrated design avoids the hassle of carrying multiple separate components and frequent wiring; users only need to carry a single device to set off, and can quickly enter working mode upon unpacking, significantly reducing operational complexity and improving the response speed and work efficiency of on-site testing.
[0021] 2. High detection accuracy and data reliability ensure the scientific value of the measurement results: Accuracy is the core of the detection instrument. This design guarantees this through multiple technical means. First, claims 4 and 9 explicitly state that probe one and probe two integrate temperature sensors, and the water temperature data measured by them is simultaneously used for measurement compensation of pH and dissolved oxygen sensors. As is well known, the measurement of pH value and dissolved oxygen concentration is greatly affected by water temperature, and readings without temperature compensation have significant errors. The integrated temperature sensing and automatic compensation mechanism of this design effectively eliminates the interference caused by temperature fluctuations, and in principle, greatly improves the accuracy of key parameter measurements. Second, claim 10 states that the probe cable uses a shielded cable, which can effectively resist complex electromagnetic interference in the field environment, prevent the distortion of weak sensor signals during transmission, and ensure the purity of the signal source from the probe to the main control board. Finally, the signal conditioning circuit mentioned in claim 3 is responsible for amplifying and filtering the acquired raw signal, further improving the signal quality and laying a solid foundation for the main control circuit to perform accurate calculations.
[0022] 3. Excellent ease of operation and intelligent human-computer interaction lower the user threshold: This instrument fully considers user experience. The display screen described in claim 6 is configured in split-screen mode, which can simultaneously and clearly display pH value, dissolved oxygen concentration, and water temperature data. This allows users to obtain all key information at a glance without switching interfaces, avoiding misreading or omissions that may be caused by frequent screen switching, and greatly improving the intuitiveness of data reading and operational efficiency. In addition, the status indicator light can intuitively display the power status and data transmission status. Combined with the low battery warning function provided by the power management module in claim 7, users can keep track of the device's working status and battery level at any time, avoiding interruptions due to power depletion during critical measurement tasks, and improving the planning and reliability of work. The communication interface group facilitates the transmission of measurement data to external devices (such as computers and printers), which is convenient for subsequent data analysis, storage, and report generation.
[0023] 4. The innovative modular and maintainable design significantly extends the equipment's lifespan and reduces long-term operating costs.
[0024] This is one of the most advantageous features of this patent. Claim 8 explicitly states that probe compartment one and probe compartment two are replaceable modular units and are connected to the housing via pluggable connectors. This design brings multiple benefits:
[0025] Easy to maintain and replace: Water quality testing probes are consumables, and their sensitive elements will gradually age, become contaminated, or be damaged with long-term use or in poor water quality. Traditional fixed designs require sending the entire device for repair, which is time-consuming and labor-intensive. This design allows users to purchase and replace only the specific probe compartment module that is faulty or has degraded performance, making the operation simple and quick and minimizing equipment downtime.
[0026] Functional Scalability: The modular design allows for future functional expansion. Theoretically, dedicated probe compartment modules for measuring different parameters (such as conductivity, ORP, turbidity, etc.) can be developed. Users do not need to purchase a complete new device; they can simply add the corresponding modules to upgrade the detection capabilities, thus protecting the initial investment.
[0027] High cost-effectiveness: Because the core controller, display, and power system are shared, redundant investment is avoided. When a sensor fails, only the relatively inexpensive probe compartment module needs to be replaced, rather than the expensive main unit, significantly reducing long-term maintenance and operating costs. Attached Figure Description
[0028] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;
[0030] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;
[0031] Figure 3 This is a schematic diagram of the overall structure of the present invention. Figure 3 ;
[0032] Figure 4 This is an anatomical diagram of the overall structure of the present invention;
[0033] Figure 5 This is a schematic diagram of the anatomical structure of probe compartment one and probe compartment two of the present invention. Detailed Implementation
[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses consistent with some aspects of this disclosure as detailed in the appended claims.
[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0036] Example 1: Portable Rapid Water Quality Monitoring Instrument for Field Use
[0037] The detector in this embodiment mainly comprises a robust engineering plastic housing, which is IP67 dustproof and waterproof certified to ensure the safety of internal components in harsh environments such as rain, snow, and sandstorms. A high-brightness solar-powered LCD screen is embedded in the upper front of the housing, allowing for clear readings even in strong sunlight. Below the screen is a group of function buttons, including a power button, mode switch button, data save / confirm button, and up / down selection buttons. The buttons are large and easy to operate while wearing gloves. Status indicator lights, using tri-color LEDs, are located next to the button group to visually display the power-on, working, low battery alarm, and data transmission status.
[0038] Two independent probe compartments are located on the lower front side of the housing 1: Probe Compartment 1 (3) and Probe Compartment 2 (4). Probe Compartment 1 (3) houses a pH sensor unit 33, with a 5-meter-long probe cable (31) using a high-strength polyurethane double-shielded cable, connected at the end to a pH composite electrode, namely Probe 1 (32). Probe 2 (42) is similarly configured, with a dissolved oxygen sensor unit 43 inside Probe Compartment 2 (43), and probe cable 2 (41) connected to a membrane-coated dissolved oxygen electrode probe 2 (42). Crucially, both pH Probe 1 (32) and dissolved oxygen Probe 2 (42) integrate a high-precision negative temperature coefficient thermistor as a temperature sensor. This design allows the system to measure water temperature in real time and use this data for automatic temperature compensation of pH and dissolved oxygen concentration measurements, greatly improving measurement accuracy and overcoming errors caused by fluctuating outdoor water temperatures.
[0039] The left side wall of the housing 1 has an embedded card slot 11 into which a detachable portable handle 12 can be inserted for easy carrying. The right side wall of the housing 1 has a communication interface group 13, including a USB-C port protected by a rubber waterproof cover and an industrial-grade RS-485 port for long-distance, interference-resistant wired data transmission. The rear of the housing 1 has an independent magnetic charging port 14, which is electrically connected to the housing.
[0040] Opening the housing 1 reveals the main control circuit board 15 mounted in the center. The main control circuit board 15 integrates several core modules: a signal conditioning circuit 151 receives weak electrical signals from probe 1 32 and probe 2 42, amplifies and filters them, converting them into stable and accurate digital signals; a data storage chip 152 uses a high-capacity FLASH chip, capable of storing tens of thousands of sets of timestamped measurement data; and a power management module 153 intelligently manages the energy consumption of the entire system. A high-capacity rechargeable lithium battery 16 is installed at the bottom of the housing 1 to power the equipment.
[0041] Fieldwork: Investigators take the equipment to a riverbank, lake, or aquaculture pond. Remove probe 1 (32) and probe 2 (42) from container 1 and place them in the water. Turn on the power; the equipment will perform a self-test.
[0042] Real-time measurement and display: The main control circuit board 15 collects and processes data from three sensors through the signal conditioning circuit 151. The display screen 2 activates a split-screen display mode, with the upper half simultaneously displaying the current pH value and dissolved oxygen concentration in large characters, and the lower half displaying the water temperature and battery level. The status indicator light 22 illuminates green, indicating normal operation. This display method allows users to obtain all key parameters at a glance without switching interfaces.
[0043] Automatic temperature compensation: The built-in temperature sensor monitors the water temperature in real time. The algorithm within the main control circuit board 15 automatically calls the pre-stored compensation curve to correct the original measured values of pH and dissolved oxygen, and outputs the final result after temperature compensation, ensuring scientific and reliable data.
[0044] Data Recording and Battery Life: Investigators save data using function key group 21. The data is stored in data storage chip 152. A powerful power management module 153 optimizes power consumption, and together with a high-capacity lithium battery 16, it can support continuous operation for more than 24 hours. When the battery is low, the power management module 153 detects a voltage drop and drives the status indicator light 22 to flash red, issuing a low battery warning.
[0045] Modular maintenance: If the pH probe 32 is accidentally damaged during use, maintenance personnel do not need to disassemble the entire housing or send it for repair. Simply unscrew the fixing knob of the probe compartment 3 to remove the entire probe compartment 3, including the sensor unit 33 and cable 31, as a module from the housing 1. Then, replace it with a new, functionally identical probe compartment module, which is connected to the main control circuit board 15 via its standard pluggable connector. The entire process can be completed in minutes, greatly reducing maintenance time and costs, making it particularly suitable for use in remote field environments.
[0046] Data export: After returning to the base, the data can be quickly exported to a computer for further analysis via the USB-C port of communication interface group 13, or connected to a remote monitoring node via the RS-485 interface.
[0047] Example 2: Laboratory Benchtop High-Precision Water Quality Analyzer
[0048] This embodiment optimizes the basic structure of Embodiment 1 for laboratory applications. The enclosure 1 is designed as a more stable benchtop structure with anti-slip pads on the bottom, allowing it to be placed stably on a laboratory table. The end face of enclosure 1 also features a large touchscreen display 2, supporting gesture operation and numeric keypad input for easy input of sample numbers and annotations. The function button group 21 is simplified to a few physical shortcut keys, while the status indicator lights 22 indicate the device calibration and communication status.
[0049] This embodiment features a higher degree of modularity. The front of housing 1 is no longer limited to two probe compartments, but instead incorporates four standardized module slots. Two of these slots house the pH probe compartment module (probe compartment one 3) and the dissolved oxygen probe compartment module (probe compartment two 4), respectively. Their internal structures are similar to those in embodiment one, but the electrode materials and electrolytes of sensor units 33 and 43 have been optimized for long-term, high-precision measurements, resulting in longer lifespans and better stability. Probe cables 31 and 41 are high-quality, low-noise shielded cables, effectively isolating interference from other electronic equipment in the laboratory.
[0050] The other two slots are idle, or can be used to install other types of sensor modules according to user needs, such as a conductivity probe module or a redox potential probe module. These modules have the same mechanical and electrical interfaces as probe compartment 3 and probe compartment 4, with pluggable connectors, achieving true "plug and play". The firmware of the main control circuit board 15 can automatically identify the type of inserted sensor module and load the corresponding measurement interface and calibration menu on the display screen 2.
[0051] The right side of the enclosure 1 features a rich array of communication interfaces, including multiple USB-A ports, a Gigabit Ethernet port, a Wi-Fi / Bluetooth module, and a standard RS-232 interface. This allows the instrument to be easily integrated into a laboratory information management system. The charging port 14 is a high-power DC input port, allowing for continuous operation with the power adapter connected.
[0052] Inside the enclosure 1, the main control circuit board 15 is the core. Its signal conditioning circuit 151 employs a high-precision circuit composed of an instrumentation amplifier and a multi-stage active filter, resulting in extremely low noise and ensuring the accuracy of weak sensor signal acquisition. The data storage chip 152 has a large capacity and can be set to automatically back up. The power management module 153 is primarily designed with linear voltage regulation, providing an extremely clean and stable operating voltage, which is fundamental to high-precision measurement. The rechargeable lithium battery 16 mainly serves as a power outage protection power supply, ensuring that data is not lost in the event of a sudden power failure.
[0053] Multi-parameter extended measurement: Laboratory personnel need to simultaneously measure the pH, DO, and conductivity of a water sample. They simply insert the conductivity probe compartment module into an available standardized slot. The system automatically recognizes this, and the conductivity reading immediately appears on display screen 2, displayed alongside pH, DO, and temperature. This enables flexible and low-cost expansion from two-parameter to multi-parameter measurements.
[0054] High precision and stability: The instrument is placed on a laboratory bench free from strong electromagnetic interference and connected to mains power. The high-precision signal conditioning circuit 151 and stable linear power supply provide optimal operating conditions for the sensor. During measurement, the built-in temperature sensors of probe one 32 and probe two 42 provide real-time, accurate water temperature data, compensating for pH and DO, ensuring the comparability and accuracy of water sample data at different temperatures, fully meeting the laboratory's requirements for data accuracy.
[0055] Convenient calibration and data management: Multi-point calibration can be easily performed via the touchscreen 2. A rich set of communication interfaces 13 allows for diverse data export methods: reports can be printed directly via USB, data can be uploaded to LIMS in real time via network, or data can be sent to a tablet for on-site analysis via Wi-Fi. This significantly improves laboratory efficiency.
[0056] Efficient maintenance and upgrades: When a sensor needs to be sent to the metrology institute for calibration, or when its performance deteriorates, laboratory personnel only need to remove the entire probe compartment module containing that sensor for repair or replacement, without affecting the operation of other sensor modules and the main unit. When upgrading instrument functions, only a new sensor module needs to be purchased and inserted, without replacing the entire main unit, thus protecting the investment.
[0057] Example 3: Emergency Monitoring System Integrated into a Mobile Platform
[0058] This embodiment demonstrates the application of the patented concept at the system integration level. The main body of the detector is designed as a compact, lightweight "black box" module. The housing 1 is made of aluminum alloy, balancing lightweight design with electromagnetic shielding performance. The end face of housing 1 no longer requires a large display screen and physical buttons; instead, it features a small status indicator light 22 and a micro USB interface for debugging. All operational commands and data input / output are completed through the communication interface.
[0059] Probe compartments 3 and 4 are designed as streamlined modules that fit snugly against the housing 1 to reduce drag during water movement. The probe cables 3141 are extremely short, directly securing probes 32 and 42 to specific locations on the unmanned surface vessel or drone pod, ensuring the sensors are submerged. Temperature sensors are also integrated into both probes.
[0060] The communication interface group 13 on the right side of the housing 1 is key to this embodiment, providing a multi-functional aviation connector that integrates data, power, and control commands. This connector directly interfaces with the main control system of a mobile platform, such as an unmanned surface vessel (USV). Through this interface, the USV both powers the detector and receives real-time water quality data from it. The rechargeable lithium battery 16 inside the housing 1 primarily serves as a backup power source, ensuring that the device can complete its final data storage in the event of an unexpected external power outage.
[0061] The main control circuit board 15 inside the enclosure 1 is optimized for low power consumption and strong anti-interference. The signal conditioning circuit 151 uses ultra-low power components while ensuring accuracy. The data storage chip 152 is used for data buffering. The power management module 153 has a wide voltage input capability to adapt to power fluctuations in the mobile platform. Crucially, the firmware of the main control circuit board 15 is pre-configured with standard Modbus RTU or custom serial communication protocols, enabling easy integration and control by external systems.
[0062] System Integration and Deployment: Following a pollution incident, rescue personnel quickly install this detector onto the unmanned surface vessel (USV) via its aviation plug communication interface group 13. The USV's main control system supplies power to the detector and sends a "start measurement" command through this interface.
[0063] Automatic navigation and in-situ measurement: The unmanned surface vessel (USV) enters the target water area according to a preset route. The detectors operate continuously, with probe 32 and probe 42 performing in-situ measurements of the water. The integrated temperature sensor operates in real time to ensure temperature compensation for pH and DO data.
[0064] Real-time data transmission and decision-making: After the measurement data is processed by the signal conditioning circuit 151, it is sent back to the unmanned surface vessel's main control system in real time by the main control circuit board 15 through the communication interface group 13. The unmanned surface vessel then transmits the data to the rear command center in real time via a 4G / 5G network. A dynamic heat map with pH and dissolved oxygen concentration distribution can then be displayed on the large screen in the command center.
[0065] Rapid Response and Source Tracing: Through real-time data, commanders can quickly determine the location, extent, and spread trend of pollution plumes, providing crucial first-hand information for decision-making and enabling rapid source tracing and effective handling.
[0066] System reliability and maintainability: Shielded cables 31 and 41 and the metal enclosure 1 effectively resist electromagnetic interference generated by the unmanned surface vessel's motors, etc. The modular design also plays a significant role here: if a sensor is damaged by a collision during a mission, the entire damaged probe compartment module can be replaced simply by unscrewing a few screws, ensuring that the monitoring system can quickly regain operational capability, which is crucial for emergency monitoring where every second counts.
[0067] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power. The main controller can be a conventional known device such as a computer for control. The detailed description of known functions and components is omitted in the specific implementation of this disclosure. To ensure the compatibility of the device, the operating methods used are consistent with the parameters of commercially available instruments.
[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A modular water quality multi-parameter analyzer, comprising a housing (1), characterized in that: The end face of the housing (1) is provided with a display screen (2), the end face of the housing (1) is provided with a function key group (21), the end face of the housing (1) is provided with a status indicator light (22), the front end of the housing (1) is provided with a probe compartment one (3), the front end of the probe compartment one (3) is provided with a probe cable one (31), the front end of the probe cable one (31) is provided with a probe one (32), the front end of the housing (1) is provided with a probe compartment two (4), the front end of the probe compartment two (4) is provided with a probe cable two (41), the front end of the probe cable two (41) is provided with a probe two (42).
2. The modular water quality multi-parameter analyzer according to claim 1, characterized in that: The left side of the housing (1) is provided with a card slot (11), the end face of the card slot (11) is provided with a handle (12), the right side of the housing (1) is provided with a communication interface group (13), and the rear end of the housing (1) is provided with a charging interface (14).
3. The modular water quality multi-parameter analyzer according to claim 1, characterized in that: The inner end of the housing (1) is provided with a main control circuit board (15), the end face of the main control circuit board (15) is provided with a signal conditioning circuit (151), the end face of the main control circuit board (15) is provided with a data storage chip (152), the end face of the main control circuit board (15) is provided with a power management module (153), and the inner end of the housing (1) is provided with a rechargeable lithium battery (16).
4. The modular water quality multi-parameter analyzer according to claim 1, characterized in that: The inner end of probe chamber one (3) is provided with a pH sensor unit (33), the inner end of probe chamber two (4) is provided with a dissolved oxygen sensor unit (43), and the inner ends of probe one (32) and probe two (42) are provided with temperature sensors. The temperature sensors are integrated in probe one (32) and probe two (42) and are used to simultaneously measure water temperature and compensate for pH and dissolved oxygen measurements.
5. The modular water quality multi-parameter analyzer according to claim 1, characterized in that: The first probe (32) is electrically connected to the main control circuit board (15) via the first probe cable (31), and the second probe (42) is electrically connected to the main control circuit board (15) via the second probe cable (41).
6. The modular water quality multi-parameter analyzer according to claim 1, characterized in that: The display screen (2) is electrically connected to the main control circuit board (15). The display screen (2) is configured to split-screen display mode, simultaneously displaying pH value, dissolved oxygen concentration and water temperature data, for displaying measurement data. The function button group (21) and status indicator (22) are electrically connected to the main control circuit board (15) respectively. The status indicator (22) is configured to display power status and data transmission status. The communication interface group (13) is used to transmit measurement data to external devices.
7. The modular water quality multi-parameter analyzer according to claim 2, characterized in that: The communication interface group (13) and the charging interface (14) are electrically connected to the main control circuit board (15) respectively. The power management module (153) is electrically connected to the rechargeable lithium battery (16) and the charging interface (14) for managing power distribution and charging. The power management module (153) is configured to monitor the power of the rechargeable lithium battery (16) and provide a low power warning through the status indicator (22).
8. The modular water quality multi-parameter analyzer according to claim 1, characterized in that: The probe compartment 1 (3) and probe compartment 2 (4) are configured as replaceable modular units to facilitate the maintenance or replacement of sensors. The probe compartment 1 (3) and probe compartment 2 (4) are connected to the housing (1) via plug-in connectors for quick replacement and maintenance. The signal conditioning circuit (151) is used to amplify and filter the signals collected by probe 1 (32) and probe 2 (42).
9. The modular water quality multi-parameter analyzer according to claim 4, characterized in that: The water temperature data measured by the temperature sensor is used for measurement compensation of both the pH sensor unit (33) and the dissolved oxygen sensor unit (43).
10. The modular water quality multi-parameter analyzer according to claim 1, characterized in that: The probe cable 1 (31) and probe cable 2 (41) are shielded cables to reduce signal interference.