18
SENSOR PREP
ARA
TION & INST
ALLA
TION
5.4. SENSOR MAINTENANCE
For correct sensor maintenance:
1. Unscrew to remove the protective shiled from the probe body and set aside.
2. Use the calibration beaker for cleaning
3. Use
HI76984942
probe maintenance kit. See section 16. ACCESSORIES for details.
Note:
If the sensors are removed from the probe body, the body of the sensors must be dried
prior to installation to prevent water from entering the sockets.
General Maintenance
• Inspect all sensor connectors for corrosion and replace sensors if necessary.
• Inspect sensor o-ring for nicks or other damage and replace the o-ring if necessary.
Use only the supplied grease as some lubricants can cause the o-ring to expand.
• After prolonged storage or cleaning, calibration of the sensors is required.
• After use rinse the probe with tap water and dry it. The pH electrode bulb and DO sensor must be
kept moist.
• Check GLP data under “Status” to ensure the sensor is still functioning properly.
pH and pH/ORP Sensor
• Remove the sensor protective shield.
• If the bulb and/or junction are dry, soak the electrode in
HI70300
Storage solution for at least
30 minutes.
• To ensure a quick response time, the glass bulb and the junction should be kept moist and not
allowed to dry. Store the sensor with a few drops of
HI70300
Storage solution or pH 4.01 buffer in
the protective cap. Tap water may also be used for a very short period (few days).
Never use distilled or deionized water to store pH sensors.
• Inspect the sensor for scratches or cracks. If any are present, replace the sensor.
• Rinse the sensor in flowing water then clean by soaking it for 1 minute in
HI70670
Cleaning solution
for mineral deposits or
HI70671
Cleaning & disinfection solution for algae, fungi and bacteria. After
cleaning, soak the sensor in
HI70300
Storage solution for 30 minutes before calibrating.