Hitachi ZW 310-6 Operator's Manual page 355

 How to Use Test Kit
IMPORTANT: Measure time precisely to obtain the
correct test results. Use a stop watch or watch
with a second hand. If the reagent color change is
checked too early or too late, correct measurement
results will not be obtained. If coolant is
maintained based on incorrect check data, damage
to the engine may result.
1. Use coolant collected from the radiator or the engine
drain cock for checking. Wait to cool the collected
coolant temperature to 10 to 54 °C (50 to 129.2 °F)
before checking.
2. As soon as one test paper is taken out of the plastic
container, close the cover correctly. Do not touch the
area coated with the reagent. If the area has already
changed to light brown use another test paper.
3. Dip the test paper into the collected coolant for one
second. After taking up the test paper, desiccate the
extra coolant.
4. Wait 45 seconds. Then, compare the changed
reagent color on the test paper with the color
specimen and determine the coolant concentration
by following procedures.
1) Take a record of the anti freeze concentration by
comparing the color on reagent section (1) with
the anti freeze color specimen printed on the test
paper plastic box (III).
2) Take a record of concentration by comparing
the color on reagent section (2) with the SODIUM
MOLYBDATE color specimen printed on the test
paper plastic box (III).
3) Take a record of concentration by comparing
the color on reagent section (3) with the SODIUM
NITRITE color specimen printed on the test paper
plastic box (III).
5. Complete all color comparison check within 75
seconds after dipping the test paper into the coolant.
MAINTENANCE
6. In case the reagent color corresponds to that
between the color specimens, take the intermediate
value. If it is difficult to determine which value should
be taken, adopt the lighter color side concentration
as a safer value.
7. Using the concentration check table, find the
intersection between the recorded SODIUM
MOLYBDATE concentration and the SODIUM NITRITE
concentration.
This intersection shows the coolant additive agent
concentration per 3.78 L (1 US gal) of the coolant.
8. The colored concentration values in the
concentration check table printed on the test paper
box represents the values to be applied when the LLC
concentration is 50%. When the LLC concentration is
40% or less, do not determine by color. Determine by
figure values.
9. Record the measured coolant additive agent
concentration value on the maintenance record
sheet as reference data when performing next
maintenance services.
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