Hach DR/850 - CYANURIC ACID Turbidimetric Method

165
Method 8139
CYANURIC ACID (7 to 55 mg/L) For water, pools and spas
Turbidimetric Method
1. Enter the stored
program number for
cyanuric acid.
Press:
PRGM
The display will show:
PRGM ?
Note: For most accurate
results, perform a Reagent
Blank Correction using
deionized water (see
Section 1).
2. Press: 24 ENTER
The display will show
mg/L, CYACD and the
ZERO icon.
3. Fill a sample cell
with 25 mL of sample
(the blank).
Note: Filtering is required
for highly turbid samples.
4. Place the blank into
the cell holder. Tightly
cover the sample cell
with the instrument cap.
5. Press: ZERO
The cursor will move to
the right, then the
display will show:
0 mg/L CYACD
Note: If Reagent Blank
Correction is on, the
display may flash “limit”.
See Section 1.
6. Fill another cell with
25 mL of sample.
7. Add the contents of
one Cyanuric Acid 2
Reagent Powder Pillow
(the prepared sample).
Swirl to mix.
8. Press TIMER
ENTER
A three-minute reaction
period will begin.
Note: A white turbidity will
form if cyanuric acid is
present.
Note: Accuracy is not
affected by undissolved
powder.