Hach POLYMETRON 8310 Benutzerhandbuch Seite 17

6.1 Maintenance schedule
Table 5 shows minimum times for regular maintenance tasks. Perform maintenance tasks more
frequently for applications that cause electrode fouling.
Task
Clean the sensor on page 17
Examine the sensor for damage
Calibrate the sensor
6.2 Clean the sensor
Pre-requisite: Prepare a mild soap solution with warm water and dishwashing detergent, Borax
hand soap or a similar soap.
Examine the sensor periodically for debris and deposits. Clean the sensor when there is a buildup of
deposits or when performance has degraded.
1. Use a clean, soft cloth to remove loose debris from the sensor.
2. Rinse the sensor with clean, hot water.
3. Soak the sensor for 2 to 3 minutes in the soap solution.
4. Use a soft bristle brush to clean the entire measuring end of the sensor.
5. To remove bacteria or algae, rinse the sensor with a chlorinated cleaning product (e.g., diluted
bleach).
6. To remove grease or oil, rinse the sensor with methanol or ethanol.
7. To remove metallic hydroxide deposits, soak the sensor for a maximum of 10 minutes in a 20%
nitric acid solution.
8. Rinse the sensor with water and then return to the soap solution for 2 to 3 minutes.
9. Rinse the sensor with clean water.
10. Calibrate the sensor.
Section 7 Troubleshooting
7.1 Intermittent data
During calibration, data is not sent to the datalog. Thus, the datalog can have areas where the data is
intermittent.
7.2 Examine the sensor
Frequent calibration is not necessary. If the measurements are not stable, do the steps that follow:
1. Examine the wire connections of the sensor cable.
2. Examine the sensor installation. Refer to the "A" and "B" installation examples in
on page 8.
3. Do the steps in Test the contacting conductivity sensor
Table 5 Maintenance schedule
90 days
X
X
Set by regulatory agencies or experience
on page 18.
1 year
Mounting
English 17