Hach FT660 sc Manuel D'utilisation De Base page 18

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.
Verification values
± 5 mNTU of the baseline
- 5 mNTU (or less) of the
23
baseline
+ 5 mNTU (or greater) of the
baseline
Verification with a dry standard without software
This procedure includes instructions on how to:
• Assign an initial baseline value to the dry standard without dry standard software
• Do a dry standard verification without dry standard software
Find and store the baseline value for the dry standard immediately after the instrument is calibrated
and after every subsequent calibration. Refer to
on page 18.
The baseline value is referenced for subsequent calibration verifications until the next calibration.
Note: This procedure can be done on instruments that use the AquaTrend
baseline value for the dry standard, pass or fail criteria (PFC) for verification and verification value.
Note: When not in use, keep the dry standard in the protective case.
Assign a baseline value to the dry standard
1. Remove the head assembly from the body of the instrument.
2. Remove the dry standard from the protective case. Refer to
3. 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
c. Make sure that the glass of the dry standard is free of chips and scratches.
4. 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
b. Turn the dry standard
c. Use a dry cloth to remove any fingerprints and oils from the glass of the dry standard.
2
If the instrument consistently does not meet the PFC, contact the manufacturer.
3
A significantly low value is 25% or less of the expected value. A significantly low value may
occur because the light source or detector is not working correctly. If the verification value is
consistently significantly low, send the instrument to the manufacturer for service.
18 English
Table 1 Interpretation of verification values
Result identified
2
The instrument is calibrated.
The instrument is not calibrated.
The instrument body may be
contaminated.
There may be fluid on the optical
surface of the dry standard.
1
/ of the dry standard. Refer to
3
Figure 8 on page 17.
1
/ of a turn clockwise until the dry standard locks in position.
8
Suggested action
None
1. Clean the instrument.
2. Do the verification again.
3. Recalibrate the instrument if necessary.
4. If recalibrated, assign a new baseline
value.
1. Clean the body of the instrument, bubble
trap, detector and dry standard.
2. Recalibrate the instrument.
3. Assign a new baseline value.
Assign a baseline value to the dry standard
®
controller by manually recording the
Figure 8
Figure 8
on page 17.
on page 17.