Twilight E2 Series User manual

Durómetro Análogo Tipo A Modelo E2A, Asker-Imada
IM-E2A

INSTRUCTION MANUAL
HOTO
INSTRUMENTS
®
Durometer
E2 Series
03/19

page 2
How the E2 durometer works
By pressing the indentor into a surface, the
material resistance force and the indentor
spring force balance, whereby the depth of
the indentor is measured providing the
hardness of the material on a scale of 100
points.
For example, if the indentor doesn’t move into the body of the durometer, the mea-
surement is zero. If the indentor moves all the way into the body of the durometer,
the measurement is 100. Results vary depending on the depth the indentor moves
into the body of the durometer. Therefore it is not consistent but increases linearly
as it indents.
E2 durometers conform to both ASTM D2240 and ISO specifications.
How to use the E2 durometer
1. Place the sample material horizontally on a hard surface.
2. Hold the durometer between both hands over the mater-
ial so that the indentor touches it.
3. Push down perpendicularly to the test material until the
presser foot makes firm contact.
4. Take a reading.
With Optional Peak Indicator
1. Make sure the peak indicator is set to zero.
2. Place the sample test material horizontally on a hard surface.
3. Hold the durometer between both hands over the material so that the indentor
touches it.
4. Push down perpendicularly to the test material until the
presser foot makes firm contact.
5. Lift the durometer and read the result from the peak
indicator.
6. Before taking another reading, reset the peak indicator to
zero and repeat the process.
Several tests should be made on a given sample and the results averaged. When
recording hardness results, the following should be noted:
1. The temperature and humidity at the time of the test.
2. The time interval (in seconds) that elapses after the presser foot makes firm
contact and the reading is made.
HOTO INSTRUMENTS

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HOTO INSTRUMENTS
How to improve measurement accuracy
The surface to be tested must be flat, clean and smooth. (The maximum allowable
surface roughness is ±0.001"). The test piece size must be at least .75" x 1.75" and
thicker than .25" (6mm). If the sample is thinner than .25" (6mm), several layers
of the same material can be stacked on top of each other (do not glue layers togeth-
er) making sure there is no air between the layers.
You may take measurements from samples that do not conform to the above
requirements, but test results should be used only as a reference.
It is recommended that you select different locations on the sample for each mea-
surement, at least .25" away from any previous measurement. Keep your measure-
ments at least .5" from all edges.
Higher readings result when pressing the durometer down fast (more force) and
lower ones when pressing down slowly. To ensure consistent measurements apply
consistent force.
Also, measurements may vary slightly if read at different times after taking the mea-
surement. For example, you may get a slightly different reading if you read the result
immediately versus 30 seconds later. Therefore, it is recommended that this aspect
of measuring be consistent.
It is recommended that readings less than 10 and above 90 be avoided.
If you are using a durometer after it has been stored for a while, press the indentor
on a surface about 20 times before using it.
IMPORTANT
Avoid applying a shock load to the indentor.
When storing, avoid environments that are humid, dusty or oily.
Do not lubricate.
Keep the indentor clean and free of scratches.
Eliminate speed and weight variables with a constant load stand.
Available with pneumatic speed control and flexible coupling or
standard weight model.

HOTO INSTRUMENTS
Checkpoint Solution
1 Is the indentor shape correct? Use an optical projector to accurately check
the shape and dimensions of the indentor.
2 Is the indicator needle firmly Press the indentor on a very hard surface so
mounted on the axle? the needle points to 100.
3 Is the indentor height correct? Make sure the needle points to zero without
any pressure on the indentor.
4 Is the durometer mechanism Height gauge is sold separately.
working properly? Use it to make sure the durometer corresponds
to the appropriate number (2, 50, 100 points).
5 Is the indentor pressure correct? Apply accurate force and make sure the
durometer indicates the specific hardness.
Troubleshooting
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INSTRUMENTS
®
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