LaMotte 2020 ClearTrace - 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.
22
Calibrate
Zero
MENU ESC ENTER
1-Point Sample
Temperature
Exit
t
t
t
t
t
t
t t
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