Processing Magazine

‘Calomel Free’ pH Sensor Electrodes

July 10, 2012

New “Calomel Free” pH and Reference Electrodes from Sensorex offer the high performance levels of calomel electrodes without the hazardous mercury associated with the design. The mercury-free electrodes are available in a glass body or in virtually unbreakable, chemically resistant thermoplastic. The “Calomel Free” design features an Ag/AgCl-based double junction reference with a unique silver ion trap that prevents contamination with the silver-sensitive sample. The reference output is adjusted to deliver the same output as Calomel electrodes using a silver chloride reference. Versatile Calomel Free Electrodes are available in a convenient combination model featuring a pH measuring cell and reference cell in a single body, with separate reference half cells also available. They are available in both sealed and refillable reference styles. Both sealed and refillable styles are available. Gel-filled sealed references are maintenance free, while refillable designs extend electrode life with a refillable reference electrolyte.