Xylem 6-Series Multiparameter - Manual (Page 130)

Sondes Section 2
YSI Incorporated Environmental Monitoring Systems Operations Manual 2-124
AMMONIUM, NITRATE AND CHLORIDE
The active element in the ammonium and nitrate ion selective electrode (ISE) sensors is a polyvinyl
chloride (PVC) membrane that is impregnated with the reagent that provides specificity for either
ammonium or nitrate. The useful life of this sensor can be reduced if the membrane is stored immersed in
water. Thus, storage in dry air is recommended for long term storage. While dry air is slightly preferable
for general storage, the short-term storage of these sensors in the sonde, with the entire sensor array in
moist air, will have no significant detrimental effect on the life of the membrane. Remove the sensor
module from the sonde and cover the vacant port with the provided plug. Place the sensor back in the
storage boot that was provided, and set aside in room air.
The chloride ISE sensor utilizes a solid state membrane that provides specificity. For long-term storage, the
module should be removed from the sonde, wiped clean with moist lens cleaning tissue, and placed in its
storage boot to prevent abrasion.
TURBIDITY, CHLORPHYLL, BGA-PC, BGA-PE, AND RHODAMINE WT
No special precautions are necessary for either the short or long-term storage of these YSI optical probes.
However, for long-term storage, the user may wish to remove the probe from the sonde, replace it with a
port plug, and store the probe in dry in air to minimize any cosmetic degradation of the probe body and to
maximize the life of the wiper.
DEPTH AND LEVEL
No special precautions are required for the sensor itself, but see instructions above with regard to
maintaining a dry atmosphere in the vent tube. Sensors can be stored dry or wet, as long as solutions in
contact with the strain gauge sensor port are not corrosive (for example, chlorine bleach).
Recommendations are identical for short-term and long-term storage.