IOP 019B.0
Effective Date: 1/26/2017
Page 7 of 8
2.
pH sensor - The key to pH sensor storage, short or long-term, is to make certain
that the sensor does not dry out. Sensors which have been allowed to dry out due
to improper storage procedures may be irreparably damaged by the dehydration
and will require replacement. You can try to rehydrate the sensor by soaking it
(preferably overnight) in a potassium chloride solution or a pH 4 buffer before
attempting to calibrate. To store the sensor, remove it from the cable and seal the
vacant port with a port plug. Fill the original shipping/storage vessel (plastic
boot or bottle) with buffer 4 solution and then submerge the sensor into the
solution. The sensor should remain submerged in the solution during the storage
period; therefore, make certain that the vessel is sealed to prevent evaporation
and periodically check the vessel to ensure the sensor does not dry out.
MAINTENANCE:
I.
Routine cleaning of pH sensor at the end of each treatment session or when pH response is slow
A.
Use clean water and a soft clean cloth, lens cleaning tissue, or cotton swab to remove all
foreign material from the glass bulb or platinum button. Then use a moistened cotton
swab to carefully remove any material that may be blocking the reference electrode
junction of the sensor.
B.
Soak the sensor for 10-15 minutes in clean water (Not DI water. Soaking in DI water will
shorten the life span of the probe) containing a few drops of commercial dish washing
liquid. Gently clean the glass bulb and platinum button by rubbing with a cotton swab
soaked in the cleaning solution. Rinse the sensor in clean water, wipe with a cotton swab
saturated with clean water, and then re-rinse with clean water.
II.
Additional cleaning when good pH response is not restored using Step I
A.
Soak the sensor for 30-60 minutes in one molar hydrochloric acid. Rinse the sensor in clean
water, wipe with a cotton swab saturated with clean water, and then re-rinse with clean water.
To be certain all traces of acid are removed, soak the sensor in clean water (Not DI water.
Soaking in DI water will shorten the life span of the probe) for about an hour with occasional
stirring.
B.
If biological contamination of the reference junction is suspected or good response is not
restored, soak the sensor for approximately 1 hour in a 1:1 dilution of household chlorine
bleach. Rinse the sensor with clean water and then soak for at least 1 hour (more if
possible) in clean water (Not DI water. Soaking in DI water will shorten the life span of
the probe) with occasional stirring to remove residual bleach from the junction. Then re-
rinse the sensor with clean water and retest.
III.
For additional troubleshooting, see user manual.
REFERENCE:
User Manual for YSI Pro 1020
Quick Start Guide for YSI Pro 1020
Calibration Tips for YSI Professional Plus Multiparameter Water Quality Meter
