8
Total Hardness High Test Procedure
1
REMOVE STRIP
Remove one (1)
eXact
®
Strip Micro THH, Part
No. 486656
from the bottle before beginning the
test. Set the strip in a dry, convenient place and
recap the bottle immediately.
2
TURN METER ON
Press the
ZERO/ON
button to power the meter on;
the display will show all annunciators, then the
current MENU selection, followed by the last
reading.
THH
TH5
INTERFERENCES: Positive interference are observed if the test sample contains Barium. Interferences also observed if the test sample contains
Copper, Lead, Cobalt or Nickel.
*NOTE: When testing outdoors (sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing and Reading the sample.
NOTE: The Calcium and Magnesium ions react with Phthalein purple to form a purple color, directly proportional to Calcium and Magnesium concentration.
RECORD RESULT DISPLAYED
The cursor will move across the display while the meter
prepares to measure the sample. Record result
displayed (this result is automatically stored in TH5
Menu). After testing is completed, rinse cell immediately
and use brush to remove any residual from previous test.
7
ZERO METER*
Press the
ZERO/ON
button. The cursor will move
across the display, followed by
0.00 PPM
. The
sample is ready for testing.
5
SELECT TEST: TH5
Press and re-press the
MENU
button until the
display shows the parameter
TH5
.
3
DIP STRIP AND PRESS “READ”
Dip the
eXact
®
Strip Micro THH, Part No. 486656
into
the
CELL
and immediately press
READ
. This starts the
20 SECOND
countdown timer. During this time move
the strip in a gentle back and forth motion (approx. 2
strokes/sec).
Remove and discard the strip when “1”
on the display disappears*
.
6
RINSE AND FILL CELL WITH SAMPLE
Rinse the
CELL
2 or 3 times with the water sample
you will be testing - rinsing minimizes the potential
for cross-contamination from a previous test. Finally,
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4
NOTE: Test samples higher than 300 ppm of Total Hardness requires dilution (see page 15).
The pH of the sample should be between 6.9 and 7.2. If the pH is
not in this range, adjust the sample to pH 7 before doing the test.
Total Alkalinity must be in the range of 65-220ppm (as CaCO3).
