InPro 4850i pH/ORP Probes

The InPro 4850i pH sensor is available in 120 mm and 225 mm lengths.

A special pH sensor is needed for chlor-alkali processes because these processes are very though on pH electrodes: chlorine poisons sensor reference systems, crystalized brine and precipitated impurities clog diaphragms, and the environment corrodes contacts. Additionally, the high-impedance output signal of sensors designed for the process is highly susceptible to interference. In short, sensors perform poorly and fail quickly.

The InPro 4850i dual-membrane pH electrode answers all these problems. Its reliability, longevity and low maintenance ensure exceptional measuring performance, no matter how tough it gets.

The key features of the InPro 4850i pH sensor that make it suitable for chlor-alkali processes are:

• Sodium-reference (pNa) system. The electrode features a sodium-sensitive glass membrane which is charged by the sodium ions in the brine. The sensor uses the sodium concentration of the brine itself as a reference.
• The absence of a diaphragm ensures stable measurement and eliminates drift. The pNa reference system is hermetically sealed; there is no diaphragm, therefore no oxidants can enter the electrode and attack the reference system.
• Digital output provides 100% signal stability. The InPro 4850i features Intelligent Sensor Management (ISM). This technology transmits a digitized signal from the sensor to the transmitter. As the signal is digital, it is low impedance so arrives at the transmitter unaffected by electrical interference.
  

The InPro 4850i family of pH sensors integrate with any appropriate METTLER TOLEDO transmitter. These include the M300, M400 and M800 transmitters. The transmitter you choose depends on your environment and complete measurement requirements. The exact transmitter for your application should be selected in consultation with your local METTLER TOLEDO representative.