IP68 High Accuracy 4-20mA pH Sensor Probe for Industrial Water Quality

The PH/ORP meter is a precision meter used to detect the pH/oxidation-reduction potential of liquids. It is designed with a microcomputer based on the principle of the primary battery and is simple to operate and easy to maintain. Not affected by color, turbidity, colloidal substances, oxidants and reducing agents, it is suitable for the determination of various media such as clean water, wastewater, industrial water, chemical reagents, etc., and is widely used in agriculture, environmental protection and industry.

The sensor uses a composite electrode, which can eliminate the influence of the inconstant "K" value, A long-term, stable and accurate measurement of PH is realized. The internal structure of the sensor is shown on the right.

PH meter is a potentiometric method to measure the PH of a solution, so the PH meter works in such a way that, in addition to measuring the PH of a solution, it can also measure the electromotive force of a battery. The PH is the activity of hydrogen ions in a substance, and the PH is the negative of the logarithm of the concentration of hydrogen ions.The main measuring components of PH meter are glass electrode and reference electrode. Glass electrode is sensitive to PH and reference electrode has stable potential.If you put these two electrodes of the PH meter together in the same solution, you make a galvanic cell, and the potential of this galvanic cell is the algebraic sum of the potential of the glass electrode and the reference electrode. The reference electrode potential of PH meter is stable, so in the case of temperature remains stable, the potential change of the galvanic cell composed of the solution and the electrode is only related to the potential of the glass electrode, and the potential of the glass electrode depends on the PH value of the solution to be measured, so through the measurement of the potential change, the PH value of the solution can be obtained.

• LCD display, Chinese menu operation, stable performance and strong reliability
• High-performance operational amplifier, ORP positive and negative poles are symmetrical, small drift, high accuracy
• Data is not lost after power off
• Dual 4-20mA transmission output, relay high and low alarm control output, RS485 communication Output
• Simultaneous display of PH value, temperature value, output current value, high alarm value, low alarm value

Host size

Sensor size

Why does the same sample give different readings on two pH meters?

PH measurement errors are due to pH electrode, pH meter host, and standard buffer.Due to two pH meter calibration conditions are not the same (e.g., correction made at different times), resulting in slightly different measurements, so use the same buffer at the same time. Two pH meters were used for calibration, and then the pH value of the sample was determined simultaneously.

What is a composite electrode?

An electrode that combines a pH glass electrode with a reference electrode is called a pH composite electrode.The main advantage of the composite electrode is the combination of two For one, easy to use.The structure of pH composite electrode mainly consists of electrode bulb, support rod, reference electrode, reference solution, shell and liquid Junction, electrode cap, electrode wire, joint, etc.