Turbidity & Total Algae Sensors - YSI ProDIGITAL User Manual

4.8
Turbidity & Total Algae Sensors
Figure 71 Sensor window
4.9
pH/ORP Sensor
The pH and pH/ORP sensors are shipped with their tips in a storage bottle containing potassium chloride (KCl)
solution. Keep this bottle for long-term storage.
Periodic maintenance is necessary to clear contamination from the sensing elements. Contaminants on the bulb and/or
junction can slow sensor response time. Clean the sensors when deposits, bio-fouling or other contamination appears
on the glass or when the sensor response time is noticeably slow. There are several methods to clean and restore the
sensor depending on the severity of fouling or contamination.
Cleaning Methods
Standard Rinse
Rinse the sensor with tap water each time it is brought in from the field. This is generally recommended for most
sensors and use cases to clear mild contamination.
If contaminants remain or the sensor exhibits a slow response time, continue with advanced cleaning.
Figure 72 Cleaning the pH and
pH/ORP sensor with dish soap
56
Clean the sensing window with a non-abrasive, lint-free cloth
If necessary, use mild soapy water.
The sensor can be stored wet or dry. For long-term storage, YSI
recommends storing the sensor dry. Install the shipping cap or sensor
guard to prevent scratches or damage to the optical sensing window.
Advanced Cleaning
For moderate contamination or slow response after advanced rinsing,
remove the sensor from the bulkhead and perform the following steps:
1. Remove any foreign matter from the sensor tip. If necessary, use a
2. Soak for 10 minutes in a mild solution of clean water and dish soap
If contaminants are removed, attach the sensor to the bulkhead and test
the response time.
If contaminants remain or response time does not improve, continue to
1 M HCl
the hydrochloric acid (HCl) soak.
moistened cotton swab to carefully remove foreign material from
the glass bulb and junction. Be careful to avoid direct contact with
the glass bulb. The bulbs are fragile and will break if pressed with
sufficient force.
(Figure 72). Rinse the sensor with tap water and inspect.
(Figure
Maintenance and Storage
71).