LaMotte 2020e, User Instruction

Page: 24 / 44

Turbidity Standards
Only use AMCO or formazin standards with the 2020. StablCal
â
standards below 50
NTU should not be used to calibrate the 2020. The diluent used in StablCal
â
standards has a different refractive index than traditional formazin standards and will
affect the results. The concentration of the calibration standard should be similar to the
expected concentration of samples that will be tested. The following standards are
available from LaMotte Company:
1480 0 NTU Standard, 60 mL (EPA and ISO)
1484 1 NTU Standard, 60 mL (EPA)
1481 1 NTU Standard, 60 mL (ISO)
1485 10 NTU Standard, 60 mL (EPA)
1482 10 NTU Standard, 60 mL (ISO)
1486 100 NTU Standard, 60 mL (EPA)
1483 100 NTU Standard, 60 mL (ISO)
CALIBRATION PROCEDURE
1. Press
*
I
ON
to turn the meter on.
1 . 3
2. Press
*
I
OK
to select
Measure
.
M a i n M e n u
* M e a s u r e
D a t a L o g g i n g
O p t i o n s
1 6 : 0 2 : 1 9 0 1 / 0 4 / 0 5
3. Rinse a clean tube (0290) three
times with the blank.
Below 1 NTU – The meter should be
blanked with a 0 NTU Primary
Standard or prepared turbidity-free
(<0.1 NTU) water. For the most
accurate results, use the same tube
for the blank and the sample.
24 ANALYSIS & CALIBRATION