Continuous methanol concentration measurement is critical in production of direct methanol fuel cell (DMFC), especially in improvement of power generation efficiency and battery life extending. The power generation efficiency is determined by the oxidation reaction rate of methanol on the electrode surface, and the oxidation reaction rate is influenced by the methanol concentration significantly.
The precise batching of methanol solution is the prerequisite of efficient electrochemical reactions and smoother electron transfer. Furthermore, it guarantees the higher output voltage and current density, finally improve the efficiency of energy conversion. Stable power output is another reason for precise control of methanol concentration. Varying power output is the outcome of fluctuations in methanol concentration. Lonnmeter methanol concentration meter is one of the best gauges to realize methanol concentration in real time, especially important in automation production line.
Measurement Methods of Methanol Concentration
No.1 Density Measurement
A density meter for liquids utilizes correlation between the density and concentration of a methanol solution to realize continuous monitoring of methanol concentration. The merits of this method lie in relative stable measurement and high accuracy according to a preset density-concentration-temperature relationship model. Contact our engineers for more parameters about the battery density meter inline.
No.2 Refractive Method
The concentration of methanol solution could be inferred by an inline densitometer or refractometer based on differences in refractive indices between methanol and its solvent. Although it's simple to operate and provides a rapid response, the refractive index varies at different temperatures. Therefore, temperature correction is necessary for accurate measurement.
No.3 Near-Infrared Spectroscopy (NIR)
A near-infrared spectrometer works on the quantitative relationship model between the absorbance and methanol concentration, performing real-time scanning of the methanol solution and measuring absorbance at specific wavelengths. In general, methanol shows specific absorption peaks within the near-infrared spectral region.
No.4 Electrochemical Sensor
An electrochemical sensor detects methanol concentration by changes in current or potential oxidation-reductions on the surface. It enables real-time online monitoring at a relative low cost for rapid response, high sensitivity and great selectivity. Nevertheless, the stability and lifespan is susceptible to contamination and environmental changes. It works in normal only with regular calibration and replacement.
No.5 Fuel Cell
Methanol concentration is able to be inferred from the current and voltage generating by a special fuel cell, in which oxidation reactions occurs to monitor methanol concentration and utilizes resources.
Contact to our engineers to get professional measurement solution of methanol concentration. Request a free quotation now!
Post time: Jan-09-2025
