LaMotte 2020 ClearTrace - Manual (Page 20)

6. CALIBRATION
NOTE: The unit should be on for 30
minutes to allow the lamp to warm up
before begining calibrations or taking
measurements.
6.1. Span Calibration
To calibrate the span for the Turbidity
System:
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 the sample chamber with AMCO Clear Turbidity Standard, 20
NTU calibration solution. The standard should overflow the
OUTLET weir located about ¾ of the way to the top of the sample
chamber. As an alternative a formazin 20 NTU calibration standard
may be prepared from a stock solution of 4000 NTU formazin and
used within 24 hours. Refrigerate when stored.
7. After filling the sample chamber with the standard, wait for the
reading to settle (less than a minute depending on the filter setting).
8. Perform a 1-point
sample calibration as
shown in the following
menu tree.
The complete calibrate menu
for the turbidity and
suspended solids is shown.
19
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
Calibrate
1-Point Sample
MENU ESC ENTER
Zero
Temperature
Exit t
t
t
t
t
t
t t
Figure 5.15: The complete calibrate menu for turbidity