MAN-MD-H-0507-01
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11
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4.5 Instrument Calibration
For routine work, only the blank calibration (0.10NTU) shall be performed. The complete
calibration procedures, should be defined by the user, according to its quality program.
There are two calibrations options, guided and free cal, only one of those should be used to
calibrate the unit, in case both are used, the last one will be saved and will be the one used for readings.
To perform a full calibration you will need diluted formazin Standards in the
0.10 NTU, 20 NTU,
100 NTU and 800 NTU, or Stabilized primary Standards in the same concentrations.
NOTE: The Standard vials must be perfectly cleaned before each measurement, using a tissue
or soft absorbent equivalent paper.
4.5.1 Guided Cal
1. Press and Hold
MENU
key for 3 seconds.
You will see ID
– Identification; Use the ▲ or ▼ keys to
select Calibrate, then press
READ
to enter it.
2.The display will show guided cal, press
READ
to enter
it.
3.the unit will request you to insert the 0,01 NTU standard and apress
READ,
after it reads this
standard and store its value, it will request you to insert the 20,0 NTU standard and so on, until the
1000,0 NTU standard is read.
If by acident you place the same standard or an standard with a close NTU value on the vial
chamber, the unit will alert you with the” Same Standard?' warning. In this case, replace
the standard for the correct one and proceed
.
NOTE 1: Ailing the vial mark with the instrument arrow.
NOTE 2: After the calibration, perform standard readings for verification, and if needed repeat
the calibration procedure.
NOTE 5: Storing the standards:- Do not store it in high temperature, or direct sun light.
