Calibration Verification; Types Of Verifications - Hach FT660 sc Manual Básico Del Usuario

Figure 7 Calibrate the instrument
1 Head assembly
2 800 mNTU StablCal
3 Bubble trap

Calibration verification

Do a calibration verification immediately after every calibration. Subsequent verifications are
referenced to the initial verification.
Do a calibration verification monthly between calibrations.
A calibration verification is a check that is done to make sure that the instrument is working correctly
and calibrated.

Types of verifications

Wet or dry standards can be used to do calibration verifications.
To do a wet standard verification, refer to
To do a dry standard verification, refer to
either:
• Verification with a dry standard and software
standard software.
• Verification with a dry standard without software
have dry standard software.
Verification procedure with a wet standard
Wet standard verification is done using 1 L of StablCal Stabilized Formazin Certified Standard
(0–5500 mNTU) for this instrument . Do not use other standards. Do not use user-prepared formazin.
Note: For the best verification results, clean the instrument before doing a wet standard verification. Refer to
the instrument on page 20.
Note: On the sc controller, there is no option to set the pass or fail criteria (PFC) for a wet verification. The default
PFC is ± 50 mNTU (0.050 NTU) or 5% of the reading, whichever is greater.
14 English
®
Certified Standard
Verification procedure with a wet standard
Prerequisites for dry standard use
4 Funnel
5 Body of the instrument
6 Bubble trap cover
on page 15—Applies to instruments with dry
on page 18—Applies to instruments that do not
on page 14.
on page 15 and then
Clean