YSI 600LS - User Manual - Manual (Page 117)

Sondes Section 2
YSI Incorporated Environmental Monitoring Systems Operations Manual 2-111
reading in air is near zero, and quite likely, is a very different reading in the water. The filter for the
conductivity readings will likely disengage when the sonde is first placed in the river water, but stay
engaged for the temperature and dissolved oxygen readings.
The filters for turbidity, chlorophyll, and rhodamine WT are somewhat different. For these sensors, the
filter is temporarily disengaged during mechanical wiping so that when wiping is finished, the reading is
the most current. The filter then reengages if possible. Optical sensor readings are frozen to the output
during wiping so that “bad” values are not output.
A value of 0.001 for the threshold roughly corresponds to the following changes in sensor readings:
Temp: 0.1 °C
Conductivity in the 100 mS/cm range: 0.1 ms/cm
Conductivity in the 10 mS/cm range: 0.01 ms/cm
Conductivity in the 1 mS/cm range: 0.001 ms/cm
Conductivity in the 100 µS/cm range: 0.1 us/cm
Dissolved Oxygen: 0.2 percent air saturation
pH, ORP, Ammonium, Nitrate and Chloride: 0.6 mV
A value of 0.01 for the threshold roughly corresponds to a 10NTU change in turbidity. A value of 1.0 for
the chlorophyll and rhodamine WT sensors threshold effectively means that the filter will be engaged under
all conditions.
2.10 CARE, MAINTENANCE AND STORAGE
This section describes the proper procedure for storage of the sensors that will maximize their lifetime and
minimize the time required to get the sonde ready for a new application. This section will describe interim
or short-term storage between applications where the sonde is being used at a regular interval (daily,
weekly, biweekly, etc.). and long term storage, (e.g., over-the-winter), where the sonde will not be used on
a regular basis for several months.
In the descriptions and instructions below, it is assumed that the user has retained the vessels (bottles,
boots, etc.) in which the individual sensors were stored on initial delivery. If these specific items have been
misplaced or lost, they can be replaced by contacting YSI Technical Support. Alternatively, the user may
have similar (and equally acceptable) storage equipment on hand even though it was not part of the original
YSI package. Common sense should be the guide on substitution of storage vessels.
REMEMBER: DO NOT ATTEMPT TO GAIN ACCESS TO THE INTERNAL CIRCUITRY OF
THE SONDE.
2.10.1 SONDE CARE AND MAINTENANCE
The YSI 6570 Maintenance Kit is available for use with your sonde. The kit includes several items that will
be helpful or necessary to perform the proper routine maintenance on your sonde.
The 6570 Maintenance Kit includes two types of O-rings (for probes and cable connector),
probe/installation/replacement tools, two cleaning brushes for the conductivity sensor, O-ring lubricant, and
a syringe for cleaning the depth sensor port.
The 6570 Maintenance Kit can be ordered from any authorized YSI dealer, or directly from YSI. See
Appendix C for details.