In-situ Aqua TROLL 600 Operator's Manual page 68

Reinstall reference
junction and wipe sensor
body dry.
If necessary, thoroughly clean the sensor connector to remove filling solution: Using a
disposable pipette, fill the connector with isopropyl alcohol (70% to 100%), Shake to dry.
Repeat 3 times. Dry overnight. When thoroughly dry, calibrate the sensor.
Replacing the Junction
Replace the junction when the sensor fails to calibrate with a reasonable slope and offset, even after you
have replaced the filling solution.
1. Unscrew the reference junction and discard.
2. Replace the filling solution and screw in a new reference solution.
3. Soak for 15 minutes, then calibrate the sensor.
Keep the junction damp at all times to avoid a lengthy re-wetting process.
Cleaning
Begin with the gentlest cleaning method and continue to the others only if necessary. Do not directly wipe
the glass bulb. To clean the pH sensor, gently rinse with cold water. If further cleaning is required, consider
the nature of the debris.
To remove crystalline deposits:
1. Clean the sensor with warm water and mild soap.
2. Soak the sensor in 5% HCl solution for 10 to 30 minutes.
3. If deposits persist, alternate soaking in 5% HCl and 5% NaOH solutions.
To remove oily or greasy residue:
1. Clean the sensor with warm water and mild soap.
2. Methanol or isopropyl alcohol may be used for short soaking periods, up to 1 hour.
3. Do not soak the sensor in strong solvents, such as chlorinated solvents, ethers, or ketones, such as
acetone.
To remove protein-like material, or slimy film:
1. Clean the sensor with warm water and mild soap.
2. Soak the sensor in 0.1 M HCl solution for 10 minutes and then rinse with deionized water.
After cleaning, rinse the sensor with water, and then soak overnight in pH 4 buffer.
1-970-498-1500
Soak sensor in tap water
for at least 15 minutes.
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