LaMotte 1964-EPA, Manual

Page: 48 / 80

11. Excessive color in a sample will absorb light and cause high readings. The user
should verify if a certain level of color will cause a significant error at the level of
turbidity being tested.
12. Observe shelf life recommendations for turbidity standards.
13. Do not use silicone oil on tubes with when testing turbidity with the TC-3000.
14. When testing at low concentrations use the same tube for the blank and the
sample.
15. Always use the positioning ring. Always insert tube into the meter chamber with the
same amount of pressure and to the same depth.
16. Occasionally clean the chamber with a damp lint-free wipe, followed by an
alcohol dampened wipe. A clean chamber and tubes are essential for reliable
results.
17. For the greatest accuracy during the calibration procedure, be sure that after the
meter is blanked and the blank is scanned as a sample, the reading is 0.00. If
not, reblank the meter and scan the blank again until it reads 0.00. When
scanning the sample, scan the calibration standard three times removing the tube
from the chamber after each scan. The readings should be consistent. Use one of
the readings to calibrate the meter. If the readings are not consistent, avoid using
an aberrant reading to calibrate the meter.
CHLORINE
The default units are ppm and the default calibration curve is for DPD Tablet reagents.
For the most accurate results, a user calibration should be performed. The letter (T) in
the upper right corner of the display indicates that the meter is in the tablet mode. To
use liquid DPD reagents, see the Set Up instructions.
ANALYSIS
TABLET DPD REAGENTS
FREE CHLORINE, COMBINED AND TOTAL CHLORINE
1. Press
*
I
OK
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
O p t i o n s
1 6 : 0 2 : 1 9 0 1 / 0 4 / 0 5
48 CALIBRATION & ANALYSIS • CHLORINE