HF scientific MicroTPW Field Portable Turbidimeters - Manual (Page 14)

MicroTPI & MicroTPW (5/10)
Rev. 1.9
8
4.3 Calibration Procedures
The following procedure is recommended to perform a full range calibration. Ensure that
the calibration standards have been indexed prior to proceeding.
1. Select the calibration function of the instrument by pressing the CAL button once.
The “CAL” icon will be illuminated on the display with “1000” flashing indicating
the standard required for this step of the calibration.
2. Insert the 1000 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).
3. 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.
4. When the instrument has completed the calibration on the 1000 NTU, it will briefly
display 1000 to indicate that it was calibrated and then prompts for the 10 NTU
standard with a flashing “10.0”.
5. Insert the 10.0 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).
6. 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 60 second count
down.
7. When the instrument has completed calibration on the 10.0 NTU, it will briefly
display 10.0 to indicate that it was calibrated and then prompts for the 0.02 NTU
standard with a flashing “0.02”.