今天跟大家分享國外原廠提供之PH電極清潔方法(附著不易去除時建議使用),也可提供給保養單位參考
PS. 清潔是治標, 使用者應先考量適合用於樣品之電極
(1)Cleaning
Cleaning methods can vary greatly depending upon the application for which the sensor is used. Some common rules
for cleaning include:
1) Never scratch or aggressively scrub the pH or ORP elements. These are delicate glass electrochemical
electrodes. They can be broken easily by mechanical force.
不可強力清潔,可先用去離子噴洗再用紙巾或軟布軟刷輕擦
2) The reference junction is a solid state non-porous cross-linked conductive polymer embedded in a porous kynar
matrix. Since the reference is solid state, it can be cleaned with aggressive chemicals. This solid state reference can also be cleaned effective by using a sharp razor edged tool.
若參考電極為Solid state type,則可使用以下幾種清潔劑
GREAT CARE SHOULD BE TAKEN NOT TO SCRATCH THE pH GLASS OR ORP ELEMENT DURING CLEANING OF THE REFERENCE JUNCTION.
Common approved cleaning solutions include:
附著未去除時, 一般建議使用之清潔劑,時間不要超過一分鐘
1.5-15% Hydrochloric Acid – (For Alkaline deposits)用於鹼性附著
2.5-15% Sodium Hydroxide – (For Organic Contaminants)
用於有機附著
3.Surfactant介面活性劑 (NON-IONIC SOAPS SUCH AS MICRO-90)
Please inquire to the factory if you plan to use any other cleaning agent.
(2)Conditioning for Calibration
清潔完一定要用去離子水泡一泡,然後泡在pH 4的緩衝溶液, 必要時可泡在飽和KCl溶液中使電極再活化,然後再校正
After the sensor has been cleaned, it must be thoroughly rinsed with deionized water to remove any residual cleaning
reagents. The sensor can then be soaked in pH 4 buffer to recondition the pH and reference elements. Some sensors
will also require a conditioning in saturated potassium chloride if the reference junction has been depleted of the ions in
the solid state conductive polymer (typical for clean water applications). Condition the sensor in saturated potassium
chloride and/or pH 4 buffer for whatever period of time is required to achieve optimal calibration results.