YSI, Incorporated
Model 85
11
SECTION 5 CALIBRATION
5.1 CALIBRATION OF DISSOLVED OXYGEN
To accurately calibrate the YSI Model 85 you will need to know the approximate altitude of
the region in which you are located.
1. Ensure that the sponge inside the instrument's
calibration chamber is wet. Insert the probe into
the calibration chamber.
2. Turn the instrument on by pressing the
ON/OFF
button on the front of the instrument.
Press the
MODE
button until dissolved oxygen
is displayed in mg/L or %. Wait for the
dissolved oxygen and temperature readings to
stabilize (usually 15 minutes is required).
3. Use two fingers to press and release both the
UP ARROW
and
DOWN ARROW
buttons at the same time.
Calibration/Storage
Chamber
4. The LCD will prompt you to enter the local altitude in hundreds of feet. Use the arrow
keys to increase or decrease the altitude. When the proper altitude appears on the LCD, press
the
ENTER
button once.
EXAMPLE:
Entering the number 12 here indicates 1200 feet.
5. The Model 85 should now display
CAL
in the lower left of the display, the calibration
value should be displayed in the lower right of the display and the current % reading (before
calibration) should be on the main display. Make sure that the current % reading (large
display) is stable, then press the
ENTER
button. The display should read
SAVE
then should
return to the Normal Operation Mode.
Each time the Model 85 is turned off, it may be necessary to re-calibrate before taking
measurements. All calibrations should be completed at a temperature which is as close as
possible to the sample temperature. Dissolved oxygen readings are only as good as the
calibration.
Summary of Contents for 85
Page 6: ...Introduction Section 1 YSI Incorporated Model 85 2 ...
Page 10: ...Preparing the Meter Section 2 YSI Incorporated Model 85 6 ...
Page 12: ...Preparing the Probe Section 3 YSI Incorporated Model 85 8 ...
Page 14: ...Overview of Operation Section 4 YSI Incorporated Model 85 10 ...
Page 18: ...Calibration Section 5 YSI Incorporated Model 85 14 ...
Page 23: ...Making Measurements Section 7 YSI Incorporated Model 85 19 ...
Page 24: ...Making Measurements Section 7 YSI Incorporated Model 85 20 ...
Page 28: ...Maintenance Section 9 YSI Incorporated Model 85 24 ...
Page 36: ...Discussion of Measurement Errors Section 11 YSI Incorporated Model 85 32 ...
Page 43: ...Warranty and Repair Section 13 YSI Incorporated Model 85 39 ...
Page 45: ...Accessories and Replacements Section 14 YSI Incorporated Model 85 41 ...
Page 47: ...Specifications Appendix A YSI Incorporated Model 85 43 ...
Page 53: ...Required Notice Appendix C YSI Incorporated Model 85 49 ...
Page 55: ...Conversion Chart Appendix D YSI Incorporated Model 85 51 ...
Page 59: ...Calibration Values Table Appendix F YSI Incorporated Model 85 55 ...
