LaMotte TC-3000 Tri-Meter - Manual (Page 52)

Testing Tips
1. Wash tubes thoroughly afer testing to prevent staining of tubes and contamination
of future test reactions with DPD residue.
2. When using liquid DPD reagents, invert bottle in a completely vertical position to
dispense uniform drops. Do not tilt bottle at an angle.
3. Follow instructions. Obey time limits.
4. In samples with extremely high chlorine concentrations, above 10 ppm, the
reagent system will show an initial flash of dark pink color that will fade quickly.
Dilute the sample and test again.
5. When testing salt water, double the amount of reagent used. Use ten drops of
each DPD liquid reagent or two DPD tablets.
6. Oxidized manganese (permanganate) will interfere with this test. Iodine and
bromine will give a positive interference.
7. A permanganate check standard is not recommended for calibration when using
the liquid DPD reagent system.
8. The averaging option is not available for the chlorine test.
9. When testing at low concentrations use the same tube for the blank and the
sample.
10. Always use the tube positioning ring. Always insert tube into the meter chamber
with the same amount of pressure and to the same depth.
11. Occasionally clean the chamber with a damp lint-free wipe, followed by an
alcohol dampened wipe. A clean cahmber and tubes are essential for reliable
results.
COLOR
Test results are reported as cu (Color Units).
Analysis
1. Press
ON to turn the meter on.
1 . 3
2. Press
*IOK 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
52 ANALYSIS & CALIBRATION • CHLORINE • COLOR