ChemSense pH and ORP (REDOX) electrodes with Annular PTFE ring diaphragm are particularly suitable for the most demanding and harsh applications in process and chemical industries. They are combination electrodes with double chamber and cartridge style reference system with salt reserve. A PT-1000 temperature sensor is supplied integrated with the sensor. Annular PTFE ring diaphragm is largely impervious to greater pollution loads or oily/fatty process water and wastewater.