User Manual

TB400-EU-EN V1.1 10/13

Calibration

A complete calibration will require testing with both 0 NTU and 100 NTU test solutions.

Notes: Before calibrating, gently shake the test solution bottle for approximately two seconds.

Ensure that the sides of the bottle are clean and dry to prevent measurement errors.

Calibration Procedure (0 NTU)

1. Insert the Zero NTU solution bottle into the testing chamber, line up the white marks, and

close and latch the cover. Turn on the meter and Press and hold the "CAL" button until the

LCD displays "CAL" then release the “CAL” button.

2. Wait one second and then the LCD will display:

Note: If the LCD does not display zero when using "0 NTU" liquid, press the "ZERO" button

continuously until the LCD displays a zero value.

3. The meter is now ready for "0 NTU" calibration.

4. Momentarily press "CAL" button. The LCD will flash CAL for about 10 seconds and then show

the following display:

5. The LCD will then display:

6. The Zero NTU calibration is complete. The meter is now ready for the 100 ntu calibration.

CAL

ntu

0.00

CAL ntu

CAL

0.00 ntu

100

CAL ntu