YSI 5200 - Manual (Page 117)

YSI Incorporated 115 5200 Recirculating System Monitor
Section 12. Storage
Proper storage between periods of usage will not only extend the life of the sensors, but will also ensure
that the unit will be ready to use as quickly as possible in your next application.
12.1 Short Term Storage
No matter what sensors are installed in the instrument, it is important to keep them moist without actually
immersing them in liquid. Immersing them could cause some of them to drift or result in a shorter
lifetime.
YSI recommends that short term storage of all multi-parameter instruments be done by placing
approximately ½ inch of tap water in the calibration/storage cup that was supplied with the instrument,
and by placing the probe module with all of the sensors installed into the cup. The use of a moist sponge
instead of a ½ inch of tap water is also acceptable, as long as its presence does not compromise the
attachment of the cup to the probe module. The calibration/storage cup should be sealed to prevent
evaporation.
NOTE: Ensure that an o-ring is installed in the o-ring groove on the threaded end of the probe module
body. See Figure 4-9 Calibration/Storage Cup Installation.
CAUTION: The water level has to be low enough so that none of the sensors are actually under water.
Check the calibration/storage cup periodically to make certain that the water is still present or the sponge
is still moist.
NOTE: If the storage water (tap water) is accidentally lost during field use, environmental water can be
used.
12.2 Long Term Storage
12.2.1 Probe Module Storage
1. Remove the pH or pH/ORP sensor from the probe module and store according to the individual
sensor storage instructions found in Section 12.2.2 Sensor Storage.
2. Seal the empty pH/ORP port with the provided port plug.
NOTE: Leave the conductivity/temperature sensor and dissolved oxygen sensor in the probe
module.
3. Follow the individual sensor storage instructions below in Section 12.2.2 Sensor Storage.
12.2.2 Sensor Storage
Temperature/Conductivity Sensor
No special precautions are required. Sensor can be stored dry or wet, as long as solutions in contact with
the thermistor and conductivity electrodes are not corrosive (for example, chlorine bleach). However, it is
recommended that the sensor be cleaned with the provided brush prior to long term storage. Refer to
Section 11.4.4 Temperature/Conductivity Sensor Cleaning.
pH and Combination pH/ORP Sensor
The key to sensor storage is to make certain that the reference electrode junction does not dry out.
Junctions which have been allowed to dry out due to improper storage procedures can usually be