Hach-lange FILTERTRAK FT 660 sc User Manual Manuel d'utilisateur télécharger pdf (Page 15)

Instruments made before April 2008 do not have dry standard software

installed. Software upgrades must be done by the manufacturer.

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 on page 13.

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.

3. Remove the head assembly from the body of the instrument.

4. Remove the dry standard from the protective case. Refer to Figure 8.

5. Record the serial number of the dry standard. Refer to Figure 8.

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

of the dry standard. Refer to

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.

b. Turn the dry standard

of a turn clockwise until the dry standard

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.

b. Turn the dry standard

of a turn counter-clockwise, then

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.

English 13

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Hach-lange FILTERTRAK FT 660 sc User Manual Manuel d'utilisateur Page 15

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