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UT-1412
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CLEANING A PROCESS pH PROBE WITH IMPAIRED RESPONSE:
2. Inorganic Scale Deposits :
3. Organic Oil or Grease Films :
4. Plugged or Dry Liquid Juncon :
1. Short - Term :
2. Long - Term :
NOTES :
4.7 Installaon of pH Electode.
Hand-tighten only! It is not necessary to apply excessive torque to achieve a liquid tight
installation. Severe twisting of the sensor housing could cause internal damage. If necessary,
use a wrench for removal only! For valve retractable sensors.
Used pH sensors which are physically intact can sometimes be restored to an improved level of
performance. All pH sensors have a given useful life span depending on the conditions of use.
One of the following procedures may prove helpful in restoring a used pH sensor. There
important Steps as follows:
1. Initial Cleaning :
Wash with a solution of liquid detergent or enzyme detergent and warm water by gently scru-
-bbing with a soft toothbrush or soft cloth. Follow with thorough rinse in D.I or clean tap water.
Dissolve the deposit by immersing the sensor's measurement tip in dilute hydrochloric acid for
a few minutes. Repeat Step No. 1 as above.
Perform initial cleaning procedure. If film is known to be soluble in a particular organic solvent,
wash with this solvent. Repeat Step No. 1 as above. Depending on the extent of the oil or
grease contamination, it's possible that the liquid junction may be damaged beyond recovery.
Soak in 3.8M KCI solution for a minimum of 30 minutes before re-calibrating and returning
sensor to service.
STORAGE OF PROCESS pH PROBE :
Remove any observed contaminant with one of the above procedures, then soak in 3.8M KCI
solution for a minimum of 30 Minutes.
Immerse sensor measurement tip and liquid junction surface areas in 3.8M KCI. If this solution
is not available, use 4.01pH buffer, clean tap water, or lastly, a sample of the process being
measured to keep the sensor hydrated.
Fill protective cap that the pH sensor was originally shipped in with a freshly prepared 3.8M KCI
solution and insert the pH sensor tip. The sensor should be stored in an upright (vertical)
position.
Never Permit the pH sensor to dehydrate or dry out. Always keep it in a wetted environment
especially when not in a service.
Cracked or broken sensors are not repairable.
Inspect cable and connector to ensure that the insulation integrity is Intact and that there
are no signs of corrosion or contaminants on the metal components
PH INDICATOR / CONTROLLER
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