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Care and Maintenance
Maintenance Schedule
For best results, send the instrument to the manufacturer for factory calibration every 12 to 18 months.
User-Serviceable Parts
The user-serviceable parts on the instrument include the O-rings, the pH/ORP sensor, and the RDO Sensor Cap.
O-rings
The instrument has several O-rings that can be maintained by the user in order to keep moisture from entering the instrument
and damaging the electronics. Apply a very thin layer of vacuum grease to new O-rings upon installation. The O-rings are
located in the following areas.
1
Connector
2
Instrument housing
3
pH sensor
4
RDO Sensor
RDO Sensor Cap Replacement
The RDO Sensor Cap has a 1-year typical life (15 months of total usage) after the sensor takes its first reading, or 36 months
from the date of manufacture. Follow the instructions included in the RDO Sensor Cap Replacement Kit. Replacement caps
are available from In-Situ Inc. or your authorized In-Situ distributor.
pH/ORP Sensor Replacement
To replace the pH/ORP sensor or to refill the reference junction, follow the instructions in the pH/ORP Sensor Instruction
Sheet that is included with the replacement sensor.
Instrument Storage
To store the probe for a week or less, place the probe in the calibration cup with at least 10 mL of clean water to maintain a
moist storage environment.
To store the probe for more than a week, perform the following procedure.
1. Remove the pH/ORP sensor and place the orange pH port plug into the empty pH/ORP port to prevent any
humidity from entering the probe.
2. Locate the sensor storage bottle in which the pH sensor was originally shipped.
3. Open the bottle and remove the O-ring.
4. Add enough pH storage solution or pH 4 solution to cover the sensor bulb (about 10 mL).
5. Slide the O-ring onto the sensor, and then slide the bottle cap over the sensor as shown.
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