Hach FT660 sc Manual Básico Del Usuario página 13

Starting in April of 2008, the aperture plate and dry standard software
will be installed on instruments at the time of manufacture.
Verification with a dry standard and software
This procedure includes instructions on how to:
• Enable the dry standard software and set the pass or fail criteria for
verification
• Find and save a baseline value for the dry standard using the dry
standard software
• Do a dry standard verification using the dry standard software
Find and save the baseline value for the dry standard immediately after
the instrument is calibrated and after every subsequent calibration. Refer
to Assign a baseline value to the dry standard
The baseline value is referenced for subsequent calibration verifications
until the next calibration.
Note: When not in use, keep the dry standard in the protective case.
Enable the dry standard software
1. From the Main menu, select Sensor Setup, [Select Sensor],
Calibrate, Verification, CVM Select, Enable.
2. To set the pass or fail criteria to a value other than the recommended
default (± 5 mNTU):
a. Select Verification, P/F Criteria.
Note: The P/F Criteria menu option is available only if CVM is set to
ENABLE in step 1.
b. Use the arrow keys to change the PFC (pass or fail criteria) value
and confirm.
The PFC range is 5–250 mNTU.
Assign a baseline value to the dry standard
1. After the instrument is calibrated and the operator initials have been
entered, the display shows "VERIFY CAL?". Confirm to start the
verification process.
2. Select DRY for the verification type and confirm.
on page 13.
3. Remove the head assembly from the body of the instrument.
4. Remove the dry standard from the protective case. Refer to
5. Record the serial number of the dry standard. Refer to
6. Clean, dry and inspect the dry standard.
a. Use the disposable wipes provided to clean the dry standard.
b. Use a dry cloth to dry the top
Figure 8.
c. Make sure that the glass of the dry standard is free of chips and
scratches.
7. Install the dry standard.
a. Put the dry standard in the aperture plate. Make sure that the
locking pin goes in the notch in the aperture plate. Refer to
Figure 8.
1
b. Turn the dry standard /
8
locks in position.
c. Use a dry cloth to remove any fingerprints and oils from the glass
of the dry standard.
8. Put the head assembly on the body of the instrument.
9. Enter the serial number of the dry standard, then confirm.
10. When the instrument reading is stable, confirm to accept the reading
as the baseline value.
11. Remove the dry standard from the instrument.
a. Remove the head assembly from the body of the instrument.
1
b. Turn the dry standard /
8
remove the dry standard from the aperture plate.
c. Put the head assembly on the body of the instrument.
12. Confirm to go to Measurement Mode.
13. Push HOME to show the online measurements.
14. Put the dry standard in the protective case.
Figure
Figure
1
/ of the dry standard. Refer to
3
of a turn clockwise until the dry standard
of a turn counter-clockwise, then
English 13
8.
8.