Maintenance; Recommended Cleaning Procedure; Table 6-1 Cleaning Procedure - Honeywell 5000TC Series Operation And Maintenance Manual

6.1

Recommended Cleaning Procedure

The sensor must be kept reasonably clean to maintain measurement accuracy. The time period between
cleanings (days, weeks, etc.) is affected by the characteristics of the process solution and can only be
determined by operating experience. For example, a sensor operating in wastewater that contains oil and/or
grease may require more frequent cleaning.
Step
1 Rinse the sensor with clean, warm water.
2 Prepare a mild soap solution. Use warm water and dishwashing detergent, Borax hand soap or a similar
soap.
3 Soak the sensor for 2 to 3 minutes in the soap solution.
4
Using a small bristle brush, cotton swab (Q-tip) or pipe cleaner, scrub the entire measuring end of the
sensor to thoroughly clean the surfaces. If detergent solution cleaning cannot remove deposits on the
surfaces, use muriatic acid (or another dilute acid) to dissolve the deposits. The acid should be as dilute
as possible, but yet strong enough to clean. Experience will help determine which acid to use and how
dilute it can be. Some stubborn coatings may require a different cleaning agent. Contact the factory for
assistance in these difficult cases.
Before cleaning with acid, determine if any hazardous reaction products could form. For example, a sensor
used in a cyanide bath should not be put directly into a strong acid for cleaning because poisonous cyanide
gas could be produced. Acids are hazardous and appropriate eye protection and clothing should be worn
in accordance with Material Safety Data Sheet recommendations.
Soak the sensor in dilute acid for no more than 5 minutes. Rinse the sensor with clean, warm water
and then place the sensor back into the mild soap solution for 2 to 3 minutes to neutralize the acid.
5 Rinse the sensor in clean, warm water.
6 Calibrate the system with conductivity reference solution using the procedure in the instrument instruction
manual. If calibration cannot be accomplished, check the sensor using the procedure in Section 5.
4/00 Series 5000TC Toroidal (electrodeless) Conductivity Sensors - Operation and Maintenance

6. Maintenance

Table 6-1 Cleaning Procedure

Action
Maintenance
25