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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 Fast Sensor Cap Replacement
The RDO Fast 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.