HF scientific MicroTPW Field Portable Turbidimeters - Manual (Page 15)

MicroTPI & MicroTPW (5/10)
Rev. 1.9
9
8. Insert the 0.02 NTU standard into the sample well and press down until the cuvette
snaps fully into the instrument. Align the indexing ring with the arrow on the
instrument (see section 4.2 if the standard is not already indexed).
9. Press and hold the
↵ button while making fine adjustments to the indexing. Release
the button to initiate the calibration. The display will now show a 30 second count
down
10. When the instrument has completed the calibration on the 0.02 NTU standard, the
instrument returns to the read mode and is ready to read.
Notes : 1. Exiting the calibration mode may be done at the end of any step by pressing
the CAL button. The instrument will store any of the values calibrated prior to
exiting.
2. Any of the three calibration points (1000 NTU, 10 NTU & 0.02 NTU) can be
selected for individual calibration by using the ▲ &▼buttons.
3. The required calibration values are set in software and can not be changed.
4.4 Calibration Error
If the screen shown below is displayed after calibration, the internal diagnostics have
determined that the calibration standards were bad or that they were inserted in the wrong
order. Either check the standards and recalibrate or restore the factory calibration as
mentioned below.
4.5
Restore Factory Calibration
If the above display appears and it can not be corrected by recalibration, the operator can
restore the factory calibration. Please note that the instrument may operate with reduced
accuracy until a new calibration can be performed.
Push and hold the ▲button. Now push and release the
↵
button then release the
▲button. The instrument will turn itself off when completed. When the instrument is
turned on again the error screen will be gone.