HYDROLAB HL Série Manuel De L'utilisateur page 38

Use a solid secondary standard only to verify the calibration of the sensor on which the value is set.
Set the value of the solid secondary standard as follows:
1. Make sure that the optical surface of the sensor is clean and dry.
2. Put the sensor into a Rhodamine Calibration Dye Solution.
3. Record the sensor output voltage (0 to 5 V).
4. Clean and dry the sensor.
5. Put the solid secondary standard on the optical end of the sensor.
6. Turn the solid secondary standard until it is aligned with the indexing mark on the sensor. A
clicking sound is heard when the solid secondary standard is correctly aligned.
7. Use the supplied screwdriver to turn the screw located on the side of the solid secondary
standard. Turn the screw until the sensor output voltage is the same as the value recorded.
Note: Turn the screw clockwise to increase the voltage. Turn the screw counter-clockwise to decrease the
voltage.
15.4 Sensor guidelines
Keep deposits off the sensor for best measurements. Examine the sensor to make sure that there
are no contaminants. Keep the substances shown in
Substance
Oil, sediment or biofilms
15.5 Maintenance
15.5.1 Clean the sensor
To prevent damage to the sensor, do not use organic solvent solutions (e.g., acetone or methanol) to clean the
sensor. Organic solvents cause damage to the plastic housing and sensor lenses.
Clean the sensor after each deployment to remove unwanted material (e.g., oil, biological growth and
dirt). In addition, clean the sensor before and after calibration.
Adjust the sonde deployment time in accordance with how quickly sensor fouling occurs in the
deployment waters.
1. Clean the sensor with:
• Mild detergent
• Warm water
• Clean, soft toothbrush
• Soft cloth and/or cotton swabs
Note: Do not use dishwashing liquid to clean the sensor. Dishwashing liquid and household cleaners with skin
moisturizer can put a film on the sensor.
2. Rinse the sensor with clean water.
3. Soak the sensor in clean water for a minimum of 30 minutes.
4. Examine the optical windows. If unwanted material is seen on the optical windows, use optical
tissue or a cotton swab with soap and water to clean the optical windows.
5. Rinse the sensor with clean water.
6. If the substance cannot be removed, contact technical support.
38 English
Table 12 Contaminants
Damage
Contaminates the sensor. If the sensor is contaminated, clean the sensor.
N O T I C E
Table 12 away from the sensor.