YSI 556 MPS - Manual (Page 105)

YSI Incorporated YSI 556 MPS Page 99
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 General Recommendations for 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 1/2 inch of tap water in the
transport/calibration 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 1/2 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 transport/calibration 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 3.7
Transport/Calibration Cup Installation.
CAUTION: The water level has to be low enough so that none of the
sensors are actually under water. Check the transport/calibration 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 General Recommendations for 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 port with the provided port plug.
NOTE: Leave the conductivity/temperature sensor and