Hitachi ZW 310-6 Operator's Manual page 354

 Precautions for Using CC2602 Test Kit
Maintain coolant temperature to 10 to 54 °C (50 to
129.2 °F) while checking. Otherwise, incorrect color
change may result.
Compare the reagent color with the color specimen
to measure the concentration in daylight. In case it
is difficult to specify the color concentration through
the comparison of the reagent color with the color
specimen, adopt the lighter side concentration as a
safer value.
The reagents provided in the test kit are sensitive to
light, heat, and excessive moisture so that they should
be stored in a plastic container. Unless the test papers
are used, be sure to close the container cover correctly.
Avoid to expose the test kit to the direct ray of the sun
while storing and maintain the ambient temperature of
the storing place to 32 °C (89.6 °F) or lower.
(SODIUM
MOLYBDATE
LEVEL)
MAINTENANCE
The effective life time of the reagent is printed on the
upper section of the CC2602 container.
Do not use any reagents after the effective life time
expires.
If the reagent color has changed to light brown or pink,
avoid using such reagent.
If the color specimen was spoiled, wipe stain with a
cloth. Do not use any soap or solvent.
The reagent color continues to change from soon after
being dipped into coolant and stops after it is dried up.
Therefore, measure the coolant concentration within
the specified time range.
Concentration Check Table
% GLYCOL/FREEZEPOINT (°F)
DCA Unit/3.78L (1 US gal)
(DCA UNITS PER GALLON)
(SODIUM NITRITE LEVEL)
7-76