Manual Temperature Adjustment - Gardco EZ ZAHN Dip Viscosity Cup Series Instruction Manual

Effl ux time to the nearest 0.1 second can be read from the conversion chart provided in this
manual or a formula can be used as follows:
1. Select the formula relating viscosity to time of effl ux in seconds when viscosity in centistokes is
known.
2. Substitute the standard label value for centistokes for "V" in the equation and solve the equation.
The resulting value is design effl ux (drain) time in seconds.
NOTE: This determined effl ux time is for the standard at 25.00°C (77.00°F) only*.
3. Make a minimum of three determinations with the cup in question on the applicable standard,
adhering to the method of use prescribed in the product leafl et or in the applicable ASTM method,
and calculate the average effl ux time.
NOTE: Pay particular attention to temperature at time of measurement. Use a thermometer that
can be read to the nearest 0.1°C or 0.2°F. Experimental results should NOT be compared against
determined design effl ux time unless temperature at time of measurement was within ± 0.2° of
25.0°C or ± 0.4° of 77.0°F*. The standard oils change in viscosity between 3% and 8%, depending
on the viscosity of the standard, for each degree change in temperature from 25°C*.
4. Compare the experimentally determined effl ux time with the design effl ux time. If experimental
results were at 25.0°C or 77.0°F*, the comparison should be within the following limits:
* With the exception of the Parlin Cups whose Viscosity in Centistokes is measured at 23°C.
Gardco EZ™Zahn (ASTM) Dip Cups ... 3%
Gardco S90/Zahn Sig. Dip Cups .......... 5%
Gardco Mini Ford Dip Cups .................. 4%
Gardco/Fisher Dip Cups ....................... 2%
Gardco/Fisher Standard Cup................ 2%
Gardco Standard Ford Cups ................ 2%
Gardco Standard Ford Dip #3 .............. 3%
Gardco Standard Ford Dip #4 .............. 2%
Gardco Standard Ford Dip #5 .............. 3%
For the technician who does not have automatic temperature control equipment the following procedure
may be useful with dip type cups: If the oil to be used is below temperature, place the bottle with the
cap slightly loosened no closer than about one foot from an incandescent desk lamp. This will slowly
raise the temperature of the oil. When within about one degree of measuring temperature, transfer
the required amount of the oil to a glass container of suffi cient height and diameter to accommodate
the viscosity cup. (Glass is recommended due to its low rate of temperature conductance.) Place the
viscosity cup to be used in the oil in the glass container so that it comes to the same temperature as
the oil and place a thermometer, preferably glass, in the oil which can also be used as a stirring rod. If
necessary to elevate the temperature slightly, simply hold the glass snugly in the hand while stirring the
contents gently and observing the change in temperature. If necessary to lower the temperature, dip the
bottom of the glass container for a few seconds in water that is 10 to 20 degrees lower than measuring
temperature and continue gentle stirring while the temperature slowly lowers. With a little practice it is
possible to make measurements very close to the target temperature.

MANUAL TEMPERATURE ADJUSTMENT

Paul N. Gardner • www.gardco.com • (954) 946-9454
Gardco/ISO Cups ................................. 2%
Gardco/ISO 8mm Cup .......................... 3%
Gardco/ISO Dip Cup............................. 3%
Gardco/DIN Cup ................................... 3%
Gardco/DIN Dip Cup............................. 3%
Gardco Parlin #1 Cup ........................... 3%
Gardco Parlin #2 Cup ........................... 3%
Gardco Parlin #3 Cup ........................... 3%
Gardco Parlin #4 Cup ........................... 5%
VISCOSITY
11