Online acid-base analyzer(Online pH meter) is a highly intelligent continuous monitoring instrument based on electrochemical principles, which displays the pH value in real time by measuring the concentration of hydrogen ions (potential difference) in the solution. It is widely used in industries, environmental protection, scientific research and other fields.
Online acid-base analyzerThe core principle is based on the electrochemical characteristics of the primary battery:
Electrode structure: composed of pH electrode (sensing electrode) and reference electrode. The front end of the pH electrode is a special glass film with built-in buffer solution and internal electrode; There is a liquid interface (such as ceramic or glass fiber) at the front end of the reference electrode, and the internal liquid contacts the test solution through the gap.
Potential difference measurement: Hydrogen ions in the solution pass through the glass film, creating a potential difference on both sides of the electrode. The potential difference has a negative logarithmic relationship with the hydrogen ion concentration (pH value), which is converted to pH value through the Nernst equation (E=(2.303RT/F) (pHi pHs)+Eas).
Signal processing: The transmitter amplifies weak electrical signals and converts them into standard currents (such as 4-20mA) or digital signals (RS485) for secondary meter display or transmission to the control system.
Core functions:
Real time monitoring and display: synchronously display parameters such as pH value, temperature, and potential value (mV), with a resolution of 0.01pH and an accuracy of ± 0.02pH/24h.
Temperature compensation: Automatically or manually compensate for the impact of temperature on measurement results to ensure data accuracy.
Alarm and Control: Supports high and low limit alarm settings, relay output (AC220V/3A) can be linked to dosing pumps or valves to achieve automated control.
Data storage and transmission: The built-in memory can continuously record data for one month (1 hour/5 minutes), supporting RS485 communication interface for remote monitoring and data analysis.
Self diagnosis and maintenance: equipped with electrode status monitoring, error calibration prompts, watchdog program anti crash and other functions, reducing maintenance costs.