Hach FT660 sc Manuel D'utilisation De Base page 19

5. Put the head assembly on the body of the instrument.
6. When the instrument reading is stable, record the value.
This value is one of three values that will be used to calculate an average value. The average
value will be the final baseline value.
7. Prepare the dry standard to be measured again.
a. Remove the head assembly from the body of the instrument.
b. Turn the dry standard
aperture plate.
c. Do steps 3–5.
8. When the instrument reading is stable, record the value.
9. Do step 7 again.
10. When the instrument reading is stable, record the value.
11. Calculate and record the average of the three recorded values. The average value is the final
baseline value for the dry standard for this specific instrument.
12. Near the final baseline value, record the serial number of the instrument and the serial number of
the dry standard. Refer to
Note: The final baseline value for the dry standard is applicable only for the combination of the dry standard
and the instrument used to measure the dry standard.
13. Remove the dry standard from the instrument.
a. Remove the head assembly from the body of the instrument.
b. Turn the dry standard
aperture plate.
c. Put the head assembly on the body of the instrument.
14. Put the dry standard in the protective case.
Verification procedure with dry standard without software
1. Do steps 1– 5 of Assign a baseline value to the dry standard
2. When the instrument reading is stable, record the value.
3. Use Table 1 on page 18 to identify the result and what action should be done.
Note: Table 1 on page 18 assumes a PFC (pass or fail criteria) of ± 5 mNTU.
4. Remove the dry standard from the instrument.
a. Remove the head assembly from the body of the instrument.
b. Turn the dry standard
aperture plate.
c. Put the head assembly on the body of the instrument.
5. Put the dry standard in the protective case.
Calibration and verification history
The calibration and verification history logs contain information on the last 12 calibrations and the last
12 verifications.
To access the calibration history logs, select Sensor Setup, [Select Sensor], Calibrate, Cal History.
To access the verification history logs, select Sensor Setup, [Select Sensor], Calibrate, Verification.
Push confirm to move through a history log. After all 12 entries are shown, the display goes back to
the menu. Push BACK to go back to the menu.
A verification history entry shows the:
• Value of the certification standard used
• Turbidity reading at verification
1
/ of a turn counter-clockwise, then remove the dry standard from the
8
Figure 8 on page 17.
1
/ of a turn counter-clockwise, then remove the dry standard from the
8
1
/ of a turn counter-clockwise, then remove the dry standard from the
8
on page 18.
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