YSI Professional Plus, Калибровочные советы, Страница: 10 / 28

2. Rinse the sensor in clean water, wipe with a cotton swab moistened with clean water (not DI water), and then
re-rinse with clean water. To be certain that all traces of the acid are removed from the sensor crevices, soak
the sensor in clean tap water for about an hour with occasional stirring.
If biological contamination of the reference junction is suspected or if good response is not restored by the above
procedures, perform the following additional cleaning step:
CAUTION : Do not mix the acid from the previous step with the chlorine bleach in the following step. A toxic
gaseous product can form from the reaction between the acid and the chlorine bleach. Be certain to copiously
rinse the sink and drain system of acid after its disposal and before the disposal of chlorine bleach.
1. Soak the sensor for approximately 1 hour in a 1:1 dilution of commercially available chlorine bleach.
2. Rinse the sensor with clean water and then soak for at least 1 hour in clean tap water with occasional stirring
to remove residual bleach from the junction. (If possible, soak the sensor for a period of time longer than 1
hour in order to be certain that all traces of chlorine bleach are removed.) Then re-rinse the sensor with clean
water and retest.
Prior to reinstalling the sensor, dry the port and sensor connector with compressed air. If you suspect port
contamination, follow the instructions in the Cleaning a Sensor Port section of this document before reinstalling
the sensor.
If your pH sensor is still not calibrating after performing a sensor cleaning, contact your local YSI Representative
r a YSI Authorized Service Center. o
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