Hach FT660 sc Manuel D'utilisation De Base page 15

1. From the Main menu, select Sensor Setup, [Select Sensor], Calibrate, Verification, Perform Ver.
2. Select the available Output Mode (Active, Hold or Transfer) from the list box and confirm.
3. Select WET for the verification type and confirm.
4. Enter the turbidity value that is on the label of the StablCal Standard bottle and confirm.
5. When the display shows "DRAIN AND CLEAN BODY. ENTER TO CONT.", fully flush the body of
the instrument with water that is less than 50 mNTU (0.05 NTU).
a. Remove the head assembly and bubble trap cover from the body of the instrument. Refer to
Figure 7 on page 14.
b. Put an empty container under the instrument.
c. Remove the drain plug from the bottom of the body of the instrument. Refer to
on page 7.
Note: There is no risk of laser exposure with the drain plug removed. The laser is disabled when the head
assembly is removed.
d. Fully flush the body of the instrument with water that is less than 50 mNTU (0.05 NTU).
e. Install the drain plug in the instrument.
6. Prepare the StablCal standard. Refer to
7. Put a funnel at the end of the bubble trap and slowly put the StablCal Standard in the funnel to fill
the body. Confirm. Refer to
8. Put the bubble trap cover and head assembly on the body of the instrument.
9. When the turbidity reading is stable (and after greater than 5 minutes), confirm to accept the
reading.
10. If "GOOD VER" (good verification) is shown:
a. Select ENTER INITIALS and confirm.
b. Enter operator initials and confirm.
c. Select RETURN SENSOR TO MEASURE MODE and confirm.
11. If "BAD VER" (bad verification) is shown:
a. To do the calibration verification again, confirm.
Note: If the verification fails two times, "Please Recalibrate" is shown, then the display returns to the
Calibrate Menu. Verification cannot be done until the instrument is recalibrated.
b. To exit, push BACK.
Note: The bad verification is saved in the verification history.
Prerequisites for dry standard use
In order to use the dry standard, the instrument must have a special aperture plate. Refer to
on page 17. The instrument can also have a software upgrade to install dry standard software.
Instruments made before April 2008 do not have the special aperture plate. Customers can order and
install the special aperture plate. Installation instructions are provided with the aperture plate.
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
on page 16.
Prepare the StablCal
Figure 7 on page 14.
Assign a baseline value to the dry standard
Figure 1
®
Standard on page 12.
Figure 8
English 15