15
SENSOR PREP
ARA
TION & INST
ALLA
TION
4. Continue to tighten the locking threads with the small hex key supplied in the maintenance kit
until the sensor is secured tightly against the probe body.
5. The sensors have to be conditioned and calibrated before use.
6. Screw the protective shield onto the probe body, to protect the sensors.
Note:
To maintain a waterproof probe, if a sensor is not installed a plug must be inserted.
5.4. SENSOR MAINTENANCE
For correct sensor maintenance:
1. Unscrew the protective shield from the probe body and set it aside.
2. Use the calibration beaker for cleaning.
3. Use
HI76981952
probe maintenance kit. See ACCESSORIES section for details.
General Maintenance
• Inspect all sensor connectors for corrosion and replace sensors if necessary.
• Inspect sensor o-rings for nicks or other damage and replace sensor if necessary.
Use only the supplied grease as some lubricants can cause the o-rings 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 must be kept moist.
Dry the EC sensor.
• Check GLP data under “Status” to ensure the sensor is still functioning properly.
pH & pH/ORP Sensor
• Remove the sensor protective cap. Do not be alarmed if any salt deposits are present. This is normal
with pH/ORP electrodes and they will disappear when rinsed with water.
• Shake down the sensor as with a clinical thermometer to eliminate any air bubbles inside the glass
bulb.
• If the bulb and/or junction are dry, soak the electrode in
HI703004
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
HI703004
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.
