18.3 Calibration
C A U T I O N
Chemical exposure hazard. Obey laboratory safety procedures and wear all of the personal protective
equipment appropriate to the chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
C A U T I O N
Chemical exposure hazard. Dispose of chemicals and wastes in accordance with local, regional and
national regulations.
Calibrate the sensors before initial use, at regular intervals and after sensor maintenance or
modifications. Periodically, do a calibration check to make sure that measurements are still within
tolerance range.
Refer to the Hydrolab Operating Software Manual for instructions on how to do the tasks that follow:
• Start a sensor calibration.
• Start a sensor calibration check.
• Set the calibration mode.
• Select the measurement units shown during calibration and calibration checks.
• Look at the calibration history.
To look at the Hydrolab Operating Software Manual, start the Hydrolab Operating Software, click
Help and select Hydrolab Operating Software Help.
When a calibration or a calibration check is started, the step-by-step instructions for the sensor show
on the display.
18.4 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 Table 15 away from the sensor.
Table 15 Contaminants
Substance Damage
Oil, sediment or biofilms Contaminates the sensor. If the sensor is contaminated, clean the sensor.
18.5 Maintenance
18.5.1 Clean the sensor
N O T I C E
To prevent damage to some sensors, do not use solvents that dissolve plastic to clean the sensors.
Note: It may be necessary to clean the sensor more frequently if the sensor is used in environments with sediment
(i.e., silt), mineral precipitate, biofilms, barnacles or pollutants such as oil.
1. Clean the sensor with:
• Mild detergent
• Non-toxic, degreasing solution, such as Simple Green
®
(A registered trademark of Sunshine
Makers, Inc.)
• Warm water
• Clean, soft toothbrush
• Soft cloth and/or cotton swabs
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