Operators Manual Owner manual

800-446-1500 37 www.in-situ.com
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 Classic Sensor Cap Replacement
The RDO Classic 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 a few
drops of clean water to maintain a moist storage environment.
To store the probe for more than a week, perform the following procedure.