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Reference Manual
00809-0100-3389
4
Maintenance
Rosemount
and free of debris and sediment at all times. The frequency of cleaning by wiping or
brushing with a soft cloth or brush is determined by the nature of the solution being
measured. Remove sensors from the process periodically and check them in buffer
solutions.
WARNING
PRESSURE AND TEMPERATURE
Before removing the sensor, be absolutely certain that the process pressure is reduced to
0 psig and the process temperature is lowered to a safe level!
If the sensor will not calibrate, refer to your transmitter reference manual for proper test
procedures. If you determine that the sensor has failed, discard and replace it.
4.1
Clean electrode
If the electrode is coated or dirty, clean as follows:
Procedure
1. Remove the sensor from process.
2. Remove the sensor from process as instructed in
3. Wipe the glass bulb with a soft, clean, lint free cloth or tissue. If this does not
4. Wash the glass bulb in a strong detergent solution and rinse it in clean water. If this
5. Wash the bulb in a dilute 5% hydrochloric acid solution and rinse with clean water.
6. Following the Warning above, wash the glass bult in dilute 5% hydrochloric acid
7. Buffer calibrate the sensor.
Reference Manual
™
389/389VP sensors require minimum maintenance. Keep the sensors clean
remove the dirt or coating, go to
remove scale.)
does not clean the glass bulb, go to
WARNING
CORROSIVE SUBSTANCE
The solution used during the following step is an acid; handle with care. Follow the
directions of the acid manufacturer. Wear the proper protective equipment. Do not
let the solution come in contact with skin or clothing. If contact with skin is made,
immediately rinse with clean water.
Soaking the sensor overnight in the acid solution can improve cleaning action.
Replace the sensor if it cannot be cleaned.
solution and then rinse it thoroughly with clean tap water. Replace the sensor if it
cannot be clean. If the glass bulb appears clean, proceed to
Retractable version
Step 4
(detergents clean oil and grease; acids
Step
5.
Maintenance
February 2019
Step
7.
31
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