YSI 5200A
81
YSI 5200A
80
ment’s selected range is in mS, then the value of the calibration solution must
be entered as mS, not µS. 1,000 µS = 1 mS. For example, if the solution is
10,000 µS at 25°C and the 5200A has selected 0-20 mS for the calibration
range, enter 10 mS as the calibration solution value.
11. Press
to confirm the entered value OR press
to abort the
calibration and return to calibration menu without saving any changes.
12. Press
to save the calibration and return to the Run Screen.
13. Remove the calibration/storage cup from probe assembly.
14. Rinse sensor and calibration/storage cup with clean water before calibrat-
ing the next sensor system and before reinstalling the probe assembly in
the system water.
DO
Menus → Calibration→ DO
To determine which sensor is the DO sensor, See YSI probe assembly 5562 - figure
4.5, page 77 or YSI probe assembly 5561 - figure 3.11, page 35.
Calibrate the DO sensor using a one point calibration. Calibration can be done in
% Saturation (%Sat) or mg/L. Calibrating in %Sat automatically calibrates mg/L
and vice versa so it is only necessary to calibrate one or the other, not both. For
both ease and accuracy, YSI recommends calibrating in %Sat.
Salinity compensation for mg/L readings is obtained from either the conductivity
sensor, if installed and enabled - page 178, or from the user entered ppt value in
the DO sensor setup menu - page 172.
Directions to Calibrate DO Sensor %Sat Value
1. Connect Probe Assembly - page 60.
2. Read Getting Ready to Calibrate - page 76.
3. Wait at least 10-15 minutes after the 5200A is powered on, or after the
DO sensor is serviced, before calibrating. (This allows enough time for
the DO sensor to stabilize).
4. If not using a Conductivity sensor or if the conductivity sensor is disabled,
enter the salinity (ppt) value of the water to be monitored in DO Sensor
Setup menu. This will result in accurate DO mg/L readings.
Menus → Sensor Setup→ DO→ppt
Configuring the 5200A
5. Enter the local elevation in the DO Sensor Setup menu, if not already
configured.
Menus → Sensor Setup→ DO→Elevation
6. Follow these instructions to create a 100% water-saturated air environment
for DO sensor calibration:
For the 5562 probe assembly - page 77:
•
Place approximately 3 mm (~ 1/8”) of water in the bottom of the
calibration/storage cup.
•
Next, engage only 1 or 2 threads of the calibration/storage cup to
ensure the DO sensor is vented to the atmosphere. Note: Make
sure that the DO sensor is not immersed in water and that there
are no water droplets on the membrane.
For the 5561 probe assembly - 35:
•
Moisten the sponge in the calibration/storage chamber with a
small amount of clean water. Do not use too much water! The
idea is to create a 100% humid environment.
•
With the sensor guard installed, place the sensor into the cali-
bration/storage chamber. Make sure that the DO sensor is not
immersed in water and that there are no water droplets on the
membrane.
7. Enter DO calibration menu
Menus → Calibration→ DO→Sat
8. Allow approximately 10 minutes for the air in the calibration cup to be-
come completely water saturated and for the temperature to equilibrate.
9. After 10 minutes, verify that the DO reading shows no significant change
for approximately 30 seconds. Then, press
to complete the calibra-
tion OR press
to abort the calibration without saving.
10. Press
to save calibration and return to Run Screen.
11. Remove the calibration/storage cup from probe assembly.
12. Rinse sensor in tap or purified water and place probe assembly in monitor-
ing location or continue calibrating other sensors.
Configuring the 5200A
