Digital water flow meter

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1. Laboratory equipment and flow measurement for hydrogen production by electrolysis of water

The laboratory equipment for hydrogen production by electrolysis of water usually uses a single small skin chamber fixture, mainly operated at atmospheric pressure. The main equipment includes a controllable hydrogen power supply, fixture type electrolytic cell, alkali circulation pump, voltmeter, and flowmeter. Flow measurement can be achieved through bubble flowmeter or volumetric flask+drainage method. The laboratory equipment consists of a laboratory electrolysis water hydrogen production device with a single friend holding pure chamber fixture as the core. The internal reaction area is usually 5 × 5cm or 10 × 10cm, mainly used for electrode material performance testing. Due to the difficulty in achieving effective pressure holding during normal pressure operation, the system design needs to simplify the pressure control process. The core equipment includes: controllable hydrogen power supply: providing stable current, supporting voltage/current regulation to meet different testing needs. Fixture type electrolytic cell: fixing electrode material to ensure stable reaction interface, and internal structure for easy observation of gas production. Alkali solution circulation pump: maintains electrolyte circulation, prevents local concentration polarization, and improves reaction efficiency. Voltage meter: Real time monitoring of the operating voltage of the electrolytic cell, assisting in the analysis of electrode overpotential. Flow meter: Directly measuring hydrogen/oxygen production rate is a key tool for calculating hydrogen production efficiency. Figure: A typical single chamber fixture electrolysis device that s

upports multi-channel synchronous testing and multi-channel testing capability. The device supports the simultaneous operation of multiple electrolysis chambers and achieves efficient comparative testing through parallel design. For example, the hydrogen production performance of different electrode materials or electrolyte formulations can be tested simultaneously, significantly improving experimental efficiency. The characteristics of atmospheric pressure operation determine that flow measurement needs to be adapted to low-pressure environments. Common methods include: bubble flowmeter: manual type: by observing the number of bubbles passing through a specific scale tube per unit time, combined with temperature/pressure correction to calculate volumetric flow rate. Suitable for rough measurement or teaching demonstrations. Figure: Manual bubble flowmeter, estimating flow rate band number through bubble counting. Display type: integrated sensor and digital display module, can output flow value in real time, with an accuracy of ± 3% and a measurement range of 0.5-1000mL/min. It supports NIST standard calibration and is suitable for precision scenarios such as gas chromatography. Image: Digital bubble flowmeter, supporting real-time measurement and data traceability. Capacity bottle+drainage method: The produced gas is introduced into a capacity bottle filled with water, and the gas production is calculated based on the volume of discharged water. It is necessary to use a stopwatch to record the time. The formula is: hydrogen production rate (mL/min)=discharged water volume (mL)/time (min). This method is low-cost, but requires manual operation and is suitable for low-frequency or confirmatory experiments. The digital bub

1. Laboratory equipment and flow measurement for hydrogen production by electrolysis of water

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