Laboratory pH Electrodes

Giorgio Bormac

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A pH electrode is a sensor with a glass membrane sensitive to H+ ion activity. This activity is converted into a proportional electrical signal. This electrical signal is then converted into pH units using a digital instrument (pH meter).

The electrodes sold by Giorgio Bormac srl are manufactured by a renowned Swiss producer and are synonymous with precision and quality. The electrode line includes a wide range of electrodes suitable for various applications, from the food sector to the chemical industry, from environmental analysis to quality control, suitable for laboratory measurements and complex industrial processes.

Contrary to common belief, there is no universal electrode; rather, there are different electrodes specific to each application. Choosing the appropriate electrode is essential for measurement quality and electrode lifespan. Using an inappropriate electrode can lead to measurement errors and significantly reduce the electrode’s lifespan.

The pH sensor consists of two electrodes, one for measurement and one for reference. The measuring electrode has a glass membrane sensitive to H+ ion activity.

The reference electrode is made with a silver wire coated with silver chloride immersed in a liquid or semi-solid electrolyte.

XS_Sensor_Lab.pdf

Certif

Technological advancements have enabled the combination of these two electrodes into a single body; a sensor made using this technology is called a monotubular combination electrode. During measurement, the electrode must operate in a vertical position, with the side filling cap open (only for electrodes with a refillable electrolyte), with the membrane and side ceramic diaphragm fully immersed in the sample. After immersion, it is necessary to shake for a few seconds and wait for measurement stability. After completing the measurement, wash the electrode with distilled water, dry with paper without rubbing, and store it in a storage solution. It is important not to store the electrode in distilled water as this makes measurement very slow and irreversibly damages the electrode.

The pH electrode is an active sensor, generating potential, so it loses its efficiency over time. The average lifespan of an electrode is from one to three years at room temperature, while at high temperatures, it drastically decreases. Another factor determining the electrode’s lifespan is the aggressiveness of the sample in which it is immersed. Extreme measurement ranges (pH 0-2 and pH 12-14) reduce the lifespan and efficiency of the measuring membrane.

Data sheet

1. XS Sensor 2-Pore K without knife	2. Knife for 2-Pore	3. Redox Electrode for pH 7 and pH 70 5MT cable + BNC	4. Redox Electrode for pH 7 and pH 70 1MT cable + BNC
5. XS Sensor Electrode 201T DHS	6. XS Sensor 2-Pore T DHS NTC with 1mt cable BNC	7. XS Sensor Standard T DHS BNC	8. XS Sensor Flow Temp-BNC DHS
9. XS Sensor 2 Pore F Temp-BNC DHS	10. XS Sensor Gel S7	11. XS Sensor Micro S7	12. XS Sensor Polymer S7
13. XS Sensor Standard ORP S7	14. XS Sensor Food Slim S7	15. XS Sensor Micro P S7	16. XS Sensor Standard BNC
17. XS Sensor Standard DIN	18. XS Sensor 2-Pore Slim S7	19. XS Sensor 2-Pore F S7	20. XS Sensor 2-Pore K with Stainless steel knife S7
21. XS Sensor 2-Pore, Stainless Steel NTC + 1mt cable BNC	22. XS Sensor 2-Pore NTC with 1mt cable BNC	23. XS Sensor 2-Pore S7	24. XS Sensor Standard S7
25. XS Sensor Flow S7	26. XS Sensor Semi Micro S7	27. XS Sensor Food S7	28. XS Sensor Zava trode S7
29. XS Sensor Flat	30. XS Sensor Standard HA S7	31. XS Sensor Standard HF S7	32. XS Sensor Polymer TIP S7
33. XS Sensor MICRO-Special S7	34. XS Sensor Standard T DIN	35. XS Sensor Standard T BNC	36. XS Sensor Standard Ag S7
37. XS Sensor Polymer PLAST	38. XS Sensor Polymer PLAST BNC	39. XS Sensor Polymer PLAST DIN	40. XS Sensor Standard KF S7
41. XS Sensor Flow Ag	42. XS Sensor 2-Pore, Stainless Steel NTC + 1mt cable DIN	43. XS Sensor 2-Pore steel S7	44. Sensor Poly Plast ORP S7
45. XS Sensor Plast ORP BNC	46. XS Sensor 2-Pore F TEMP BNC	47. XS Sensor 2-Pore F TEMP DIN (Pt1000)	48. XS Sensor Flow T BNC NTC 30K
49. XS Sensor Flow T DIN PT 1000	50. XS Sensor Food T BNC	51. XS Sensor Electrode G 210 T Pt 1000 (BNC + Banana 4 mm) Plastic Body	52. XS Sensor Electrode G 214 T Pt 1000 (BNC + Banana 4 mm) Glass Body
53. XS Sensor G 216 T	54. XS Sensor G 221 T	55. XS Sensor Elettrodo 201T – 5 m	56. pH Electrode 201T DIN plug and 1 Banana 4mm
57. Electrode RX 3mt cable for REVIO and PCD 650