LaMotte 2020 ClearTrace User Manual

Page 23

6.2 Zero Calibration

The zero calibration is extremely sensitive and should not be adjusted
unless absolutely necessary. The following criteria must be met to achieve a
successful zero calibration:

1. The chamber must be completely clean and free of particulates.
2. An AMCO CLEAR TURBIDITY STANDARD, 0.0 NTU or water

passed through a 0.2 micron filter must be used.

3. There must be no air bubbles introduced through the inlet to the

chamber.

From the Calibrate menu,

use the UP/DOWN arrows to
display ZERO calibration.
Press ENTER to select.

1. Drain the sample

chamber.

2. Shut off flow to the

sample chamber.

3. Remove the chamber lid and place it

on top of the AV38.

4. Rinse the chamber with clean water

and then with a small amount of
calibration solution. (See calibration
kit instructions Code-5-0114 or code
5-0015 for procedure.)

5. Shut off the Drain.

6. Fill sample chamber with AMCO CLEAR TURBIDITY

STANDARD, 0 NTU calibration solution. The standard should
overflow the OUTLET weir located about 3/4 of the way to the top
of the sample chamber.

Calibrate
Zero

ESC

ENTER

1-Point Sample
Temperature
Exit

Drain Chamber, Shut off Inlet

Drain and Inlet are shut off:

Ready to calibrate

Sample Chamber

with Lid Removed

Be careful to pour standard directly

into the SAMPLE CHAMBER.

Do not pour standard into the

Bubble trap.

During this operation, water will

remain int he BUBBLE TRAP and

it is not necessary to remove it.

Sample Chamber

Bubble Trap