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MicroPurge® Flow Cell Quick Calibration Guide
MP25 & MP25T
Sensor Calibration
To Start:
7. Connect Sonde to the Bluetooth Battery Pack and then connect to your tablet or smartphone through the
TM
MicroPurge
8. After the sonde has successfully connected, press Settings> MicroPurge Sonde > Calibrate.
9. Set up the MP25 sonde in the calibration stand that slips over the edge of the carrying case and remove the
bottom cap from the storage/calibration cup.
To Calibrate:
1. Select Parameter to Calibrate, then press Calibrate
2. Enter Calibration Standard into the text field and hit done on the keypad.
3. Pour Calibration Standard into storage/calibration cup until sensors are fully submerged.
4. Wait up to 1 minute for number to appear on lower right corner of dialog box.
5. Hit OK
After this point the application will bring up another dialog box to calibrate to a second standard if applicable
(e.g., pH or turbidity). Follow the same steps above for the second standard. After successful calibration of
second standard the application will prompt for a third standard calibration for pH; this is not necessary but is
recommended for a more accurate data representation.
To Calibrate Barometric Pressure for HDO (choose one method):
15. Set the BP by typing in the correct pressure, if known, into the first test box. If entered the elevation will be
automatically estimated and shown in the second box. This value should correlate with your current elevation.
16. The BP can be estimated by entering the altitude into the second text box. If entered the BP will automatically
be estimated and shown in the first box.
Common Calibration Parameters and Standards
Sensor
Standard Method of Calibration
Temperature
Never requires calibration
pH / pH Reference
2 or 3 points
ORP
1 Point
1 Point
Conductivity
calibration not required
Reference Electrode
Depth
Adjust for barometric pressure
Turbidity
2 points
calibrate at 100% saturated water
HDO (Optical DO)
App. (See section 3.2 in the MP25 O&M Manual for more details.)
Available Calibration Solutions
N/A
pH 4, pH 7, pH 10
ORP Standard Solution, such as
ZoBell's or Light's solution
CD Standard, 0.5 Molar, 58670 Micro S
CD Standard, 0.1 Molar, 12856 Micro S
CD Standard, 0.01 Molar, 1412 Micro S
CD Standard, 0.001 Molar,147 Micro S
N/A
N/A
0 NTU, 10 NTU, 100 NTU, 400 NTU
DI water shaken vigorously to
oxygenate
Comments
pH 7, pH 10 most common
ORP standards can range from
200 – 475 mV, any will work
brackish/saltwater borderline
brackish water typical
freshwater very pure
fresh/glacial water
replace pH electrolyte
solution at routine calibration
Recalibrate at deployment
site for best accuracy
calibrate near expected value
set BP before calibrating,
recalibrate at deployment site
for best accuracy
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