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Sensor Response Factor (SRF)
The Sensor Response Factor is created based off the calibration that was executed. This will tell the user how
near or far each individual sensor is out of specification, and may need possible replacement if number is far
enough out of specification. When you press the OK button to accept a calibration, the MP25 automatically
accepts your calibration if the SRF is between 60% and 140%. If the SRF falls outside that range, you will be
cautioned to check your standard value, make sure the sensor is clean, make sure the reading has stabilized, etc.
You can elect to accept any SRF value and continue with calibration.
Calibrating barometric pressure for Dissolved Oxygen (DO)
There are two ways to calibrate the Barometric Pressure (BP) on the MP25 or MP25T. NOTE: The MP25 and
MP25T sondes do not have depth sensors installed so the
Get BP
or
Check BP
buttons will not operate.
Method 1: 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. If you know the elevation at your location, the
calculated value in the second box should correlate with that elevation.
Method 2: 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.
