YSI 5200A
83
YSI 5200A
82
Directions to Calibrate DO Sensor mg/L Value
A large bucket can be used when calibrating the DO mg/L reading. Be sure to
provide sample flow across the membrane by physically stirring the probe or using
a stirrer such as a stir bar. The DO sensor requires a sample flow rate of at least 3
inches (~7.62 cm) per second if using the 2.0 mil PE membrane (blue) and at least
6 inches (~15.24 cm) per second if using the 2.0 mil Teflon membrane (gray).
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
5. Place the DO probe in a water sample with a known DO concentration
(the DO mg/L value can be determined from another recently calibrated
DO instrument or from a Winkler titration).
6. Enter the DO calibration menu.
Menus → Calibration→ DO→mg/L
7. Let probe stabilize for approximately one minute.
8. After one minute, verify that the DO value shows no significant change for
approximately 30 seconds. Then, press
to complete the calibration
OR press
to cancel the calibration without saving.
9.
Use the arrow keys to select numbers on the numeric keypad, enter
the known DO value in mg/L. Press
to confirm each number selection.
10. Press
to confirm the entered value OR press
to abort the
calibration without saving any changes.
Configuring the 5200A
11. Press
to save the calibration and return to the Run Screen.
12. Rinse sensor in tap or purified water and place probe assembly in system
stream or continue calibrating other sensors.
ORP
Menus → Calibration→ ORP
The ORP sensor - figure 4.5, page 77 - is calibrated with a one point calibration.
Directions to Calibrate ORP Sensor
1. Connect probe assembly - page 60
2. Read Getting Ready to Calibrate - page 76
3. Fill calibration cup with
30 ml
of known ORP solution. We recommend
using Zobell solution.
4. Carefully immerse the sensor into the solution.
5. Gently rotate and/or move the probe module up and down to remove any
bubbles from the pH/ORP sensor.
6. Screw the calibration/storage cup on the threaded end of the probe module.
7. Enter ORP calibration menu:
Menus → Calibration→ ORP
8. Allow at least one minute for temperature equilibration.
9. After one minute, verify the ORP and temperature values show no sig-
nificant change for approximately 30 seconds. Then, press
to
complete calibration OR press
to abort the calibration and return
to calibration menu without saving any changes.
10.
Use the arrow keys to select numbers on the numeric keypad, enter
the value of the solution. Press
to confirm each number selection. The
Configuring the 5200A
