Hach-lange FILTERTRAK FT 660 sc User Manual Manuel d'utilisateur télécharger pdf (Page 17)

Table 1 Interpretation of verification values

Verification values Result identified Suggested action

± 5 mNTU of the

baseline

The instrument is

calibrated.

None

- 5 mNTU (or less) of

the baseline

2**

The instrument is not

calibrated.

1. Clean the instrument.

2. Do the verification again.

3. Recalibrate the instrument

if necessary.

4. If recalibrated, assign a

new baseline value.

+ 5 mNTU (or

greater) of the

baseline

The instrument body

may be contaminated.

There may be fluid on

the optical surface of the

dry standard.

1. Clean the body of the

instrument, bubble trap,

detector and dry standard.

2. Recalibrate the instrument.

3. Assign a new baseline

value.

If the instrument consistently does not meet the PFC, contact the

manufacturer.

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.

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 Assign a baseline value to the dry standard on page 15.

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

controller by manually recording the 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 Figure 8

on page 14

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

of the dry standard. Refer to

Figure 8 on page 14.

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

Figure 8 on page 14.

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.

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

of a turn counter-clockwise, then

remove the dry standard from the aperture plate.

c. Do steps 3–5.

8. When the instrument reading is stable, record the value.

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Hach-lange FILTERTRAK FT 660 sc User Manual Manuel d'utilisateur Page 17

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