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icon displays to ensure measuring accuracy; when icon displays, the battery must be
replaced, otherwise the instrument can't work properly. To extend battery life, user can setup auto-
power off timer in Parameter Setup P6 according to usage requirements
3. Use the screwdriver to remove the four screws on the battery cover and open the battery cover.
Insert 4 pieces of “AA” alkaline battery. Please make sure the polarity is correct. Put on the battery
cover and screw tightly.
4
METER CALIBRATION
4.1
Preparation for Calibration
a)
Calibration Point
The instrument has 5 calibration points: 0 NTU, 20 NTU, 100 NTU, 400 NTU, and 800 NTU. Among
them, 0 NTU point uses AMCO 0.0 NTU calibration solution or laboratory distilled water, and the
remaining 4 calibration points use AMCO polymer solutions. Note that the cap of the 0.0 NTU solution
vial can be opened. Once the solution is invalidated, users can replace the 0.0 NTU calibration
solution or laboratory distilled water. The AMCO 0.0 NTU calibration solution can be purchased from
the supplier; For the remaining 4 calibration solutions, their vial caps are sealed and cannot be
opened. Simply dispose the solutions after they are expired and buy new ones from your supplier to
replace. See the detail in Section 7 Replacement Parts.
b) Replace zero turbidity solution
⚫
Replace with 0.0 NTU calibration solution: open the vial cap, pour out the original solution, add
1/2 distilled water, close the cap and shake the vial to rinse it and pour out the water. Repeat it
3 times. Shake off the distilled water in the vial. Pour in new 0.0 NTU calibration solution and
tighten the vial cap.
⚫
Replace with laboratory distilled water: open the vial cap, pour out the original solution, add 1/2
distilled water, close the cap and shake the vial to rinse it and pour out the water. Repeat it 3
times. Shake off the distilled water in the vial. Pour in new laboratory distilled water and tighten
the vial cap.
⚫
The accuracy of 0.0 NTU calibration solution and laboratory distilled water is same. But 0.0 NTU
calibration solution has 6 to 12 months of shelf-life, distilled water can be contaminated easily
after air contact and lose the validity in a couple of days.
AMCO 0.0 NTU solution is provided in factory configuration. For purchase details, please refer to
Section 7 Replacement Parts.
c) Clean vial surface
Apply a small drop of silicone oil on the surface of the vial and wipe it off with a micro-fiber cloth to
evenly distribute the silicone oil on the surface so as to cover smudges or scratches, which helps
light scattering. But please pay special attention to the following points:
