KPH500 High Precision PH ORP Meter with 4-20mA Output LCD Display and PVC Material for Water Quality Monitoring

The PH/ORP meter is a high-precision instrument designed for detecting the pH and oxidation-reduction potential of liquids. It operates on the principle of a primary battery and features a microcomputer for user-friendly operation and easy maintenance. Resilient against interference from color, turbidity, colloidal substances, oxidants, and reducing agents, this meter is well-suited for analyzing various media such as clean water, wastewater, industrial water, and chemical reagents. It finds widespread applications in agriculture, environmental protection, and various industries.

The sensor is equipped with a composite electrode, effectively eliminating the impact of variable "K" values and ensuring long-term stability and accuracy in pH measurements. The internal structure of the sensor is depicted on the right.

The pH meter employs a potentiometric method to measure the pH of a solution. Beyond pH measurement, this device can also assess the electromotive force of a battery. pH, representing the activity of hydrogen ions in a substance, is the negative logarithm of the hydrogen ion concentration. The core components of a pH meter are the glass electrode, sensitive to pH, and the reference electrode, which maintains a stable potential.

Combining these two electrodes in the same solution creates a galvanic cell, and the potential of this cell is the algebraic sum of the potentials of the glass and reference electrodes. The reference electrode's potential in the pH meter remains stable. When the temperature is constant, the potential change of the galvanic cell, formed by the solution and the electrodes, is solely linked to the potential of the glass electrode. The potential of the glass electrode, in turn, is influenced by the pH value of the solution being measured. By measuring the potential change, the pH value of the solution can be determined.

• 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