
Sondes
Section 2
YSI Incorporated
Environmental Monitoring Systems Operations Manual
2-42
Monitoring Applications
If your instrument will be used in monitoring applications where data is being captured at a longer interval
(e.g. 15 – 60 minutes) to internal sonde memory, a data collection platform or a computer, you need to
activate “Autosleep RS232” as described in
Section 2.5, Sonde Software Setup
. Then follow the
instructions detailed above for the Sampling Application calibration. With Autosleep active, the calibration
will occur automatically with a display similar to that shown below.
After the warm-up time is complete, the readings just before and just after calibration are displayed. When
you press
Enter
, the screen returns to the DO Calibration menu.
ROX OPTICAL DISSOLVED OXYGEN
Place the sensor either (a) into a calibration cup containing about 1/8 inch of water which is vented by
loosening the threads or (b) into a container of water which is being continuously sparged with an aquarium
pump and air stone. Wait approximately 10 minutes before proceeding to allow the temperature and
oxygen pressure to equilibrate.
Select
ODOsat %
and then
1-Point
to access the DO calibration procedure. Calibration of your Optical
dissolved oxygen sensor in the DO % procedure also results in calibration of the DO mg/L mode and vice
versa.
Enter the current barometric pressure in
mm of Hg.
(Inches of Hg x 25.4 = mm Hg).
Note:
Laboratory barometer readings are usually “true” (uncorrected) values of air pressure and can be used
“as is” for oxygen calibration. Weather service readings are usually not “true”, i.e., they are corrected to sea
level, and therefore cannot be used until they are “uncorrected”. An approximate formula for this
“uncorrection” (where the BP readings MUST be in mm Hg) is:
True BP = [Corrected BP] – [2.5 * (Local Altitude in ft above sea level/100)]
Press
Enter
and the current values of all enabled sensors will appear on the screen and change with time as
they stabilize. Observe the readings under ODOsat %. When they show no significant change for
approximately 30 seconds, press
Enter
. The screen will indicate that the calibration has been accepted and
prompt you to press
Enter
again to return to the
Calibrate
menu.
The minor advantages and disadvantages of calibration in air-saturated water versus water-saturated air are
outlined in
Appendix M, ROX Optical DO Sensor
NOTE CAREFULLY: As opposed to the 6562 Rapid Pulse Polarographic DO sensor described above,
there is no difference between the calibration routine for sensors which will be used for sampling or
monitoring applications. Usually the Autosleep RS-232 feature in the
Advanced|Setup
menu will be
activated for ROX calibrations, but there is no problem if it is not active.
Rinse the sonde in water and dry the sonde.
===================================================================
Temp SpCond Sal DOsat DO Depth pH NH4+ N NO3- N Turbid
C mS/cm ppt % mg/L feet mg/L mg/L NTU
-------------------------------------------------------------------
Stabilizing: 38
Содержание 6 series
Страница 195: ...650 MDS Section 3 YSI Environmental Monitoring Systems Operations Manual 3 65 ...
Страница 196: ...650 MDS Section 3 YSI Environmental Monitoring Systems Operations Manual 3 66 ...
Страница 297: ...Warranty and Service Information Section 9 YSI Incorporated Environmental Monitoring Systems Operations Manual 9 5 ...
Страница 305: ...Required Notice Appendix B YSI Incorporated Environmental Monitoring Systems Operations Manual B 2 ...
Страница 319: ...Turbidity Measurements Appendix E YSI Incorporated Environmental Monitoring Systems Operations Manual E 6 ...
Страница 327: ...EMC Performance Appendix H YSI Incorporated Environmental Monitoring Systems Operations Manual H 2 ...
Страница 337: ...Chlorophyll Measurements Appendix I YSI Incorporated Environmental Monitoring Systems Operations Manual I 10 ...
Страница 341: ...Percent Air Saturation Appendix J YSI Incorporated Environmental Monitoring Systems Operations Manual J 4 ...
Страница 345: ...PAR Sensor Appendix K YSI Incorporated Environmental Monitoring Systems Operations Manual K 4 ...
Страница 359: ...ROX Optical DO Sensor Appendix M YSI Incorporated Environmental Monitoring Systems Operations Manual M 10 ...
Страница 363: ...NMEA Applications Appendix N YSI Incorporated Environmental Monitoring Systems Operations Manual N 4 ...