Hach FT660, FT660SC User Manual
DOC272.53.90012
Instruction Sheet
FT660 and FT660sc dry standard quick check verification
Safety Information
Please read this entire document before unpacking, setting up, or operating this
equipment. Pay attention to all danger and caution statements. Failure to do so could
result in serious injury to the operator or damage to the equipment.
Make sure that the protection provided by this equipment is not impaired, do not use or
install this equipment in any manner other than that specified in this document.
Electrical equipment marked with this symbol may not be disposed of in European public disposal systems after
12 August of 2005. In conformity with European local and national regulations (EU Directive 2002/96/EC),
European electrical equipment users must now return old or end-of life equipment to the Producer for disposal at no
charge to the user.
Note: For return for recycling, please contact the equipment producer or supplier for instructions on how to return
end-of-life equipment, producer-supplied electrical accessories, and all auxiliary items for proper disposal.
General Information
This instruction sheet gives directions on how to use a dry standard to verify the
calibration of a FilterTrak 660 sc or FT660.
This instruction sheet is divided into two main sections:
Product Overview
The dry standard is based on the light scatter at very low turbidity levels and typically
measures between 15 and 75 mNTU. It has an assignable range through 1000 mNTU.
The value is very reliable when the dry standard is prepared and used as instructed.
Prerequisites
• Section 1 gives instructions on how to enable the dry standard software. It also
gives instructions on how to do dry standard verifications with the software. This
applies only to FT660 sc instruments.
• Section 2 gives instructions on how to do the general dry standard verification
procedure on instruments (including the FT660 sc) that do not use the dry
standard software. The procedure can be done on FT660 instruments that use the
AquaTrend
criteria, and the verification value.
®
controller by manually recording the baseline value, the pass / fail
In order to use the dry standard, FT660 and FT660 sc instruments must be fitted with a
special aperture plate. FT660 sc instruments can also be upgraded with software that
automatically finds and stores baseline and verification values.
Instruments made before April 2008 can be retrofitted with the necessary aperture plate
which can be installed by the customer. Refer to the instructions supplied with the aperture
plate. Software upgrades must be done by a Hach technician.
Starting in April of 2008, the dry standard aperture plate and software will be installed on
all FT660 sc laser turbidimeters at the time of manuifacture.
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FT660 and FT660sc dry standard quick check verification
Section 1 Verification of FT660 sc with dry standard and software
The FT660 sc software is designed to find and store a baseline value for the dry standard.
A baseline value must be found after the initial calibration. This value will be referenced for
subsequent verifications until the next calibration. When the instrument is recalibrated for
any reason, a new dry standard baseline value must be found.
Note: When not in use, keep the dry standard in the protective case.
1.1 Enable the dry standard software
1. From the sc100 menu, choose SENSOR SETUP.
2. Choose the sensor for which the dry standard is to be enabled.
3. Choose the CALIBRATE option and then select VERIFICATION.
4. Choose CVM SELECT and press ENTER.
5. Choose ENABLE and press ENTER.
6. Press ENTER to return to the CALIBRATION menu.
7. Select VERIFICATION, P/F Criteria to set the Pass or Fail Criteria to a value other
than the recommended default of ± 5 mNTU.
Note: The P/F Criteria menu option appears only if the CVM is set to ENABLE.
8. Use the arrow keys to adjust the PFC value and press ENTER. The allowable range is
between 5 mNTU (the default value) and 250 mNTU.
1.2 Assign a baseline value to the dry standard
Note: Assignment of a baseline value can be done only after the instrument has been
successfully calibrated.
1. Once a successful calibration has been done and the operator initials have been
entered, the display shows VERIFY CAL? Press ENTER to begin the verification
process.
2. Choose DRY for the verification type and press ENTER.
3. Remove the turbidimeter head. Refer to Figure 1 on page 3.
4. Remove the dry standard from the protective case and record the serial number
etched into the dry standard collar. Refer to Figure 2 on page 4. The serial number
must be entered to determine a baseline value.
5. Inspect the dry standard glass rod to make sure it is clean and free of chips and
scratches. Clean the device with the disposable wipes provided.
6. Dry the top
7. Insert the dry standard into the aperture plate. Make sure the alignment pin fits into the
notch. Refer to Figure 2 on page 4.
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/3 of the dry standard and the top surface. Refer to Figure 2 on page 4.
FT660 and FT660sc dry standard quick check verification
8. Rotate the dry standard approximately 1/8 of a turn to the right until the dry standard
locks into position. Refer to Figure 2 on page 4.
9. Dry off the remainder of the glass to remove any fingerprints and oils.
10. Place the turbidimeter head on the body. Make sure the head is correctly positioned
and press ENTER.
11. Enter the digits of the dry standard serial number and press ENTER.
12. Allow the instrument reading to stabilize. Press ENTER to accept the reading as the
baseline value.
Note: The user does have the option to push ENTER before the reading becomes stable.
However, this may cause inaccurate baseline values.
13. Remove the dry standard, replace the head and press ENTER to continue to
Measurement Mode. Place the dry standard back into the protective case.
Figure 1 Remove turbidimeter head
1 FT660 body 2 FT660 head
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