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© AMETEK, Inc.
3.1 Measuring standards
To have a high flexibility, MINIFLASH FP(H) VISION offers you five different measuring modes:
Two of them are ASTM Standard methods: ASTM D6450 and ASTM D7094
Standard method ASTM D6450
The ASTM D 6450 method was published in year 1999 after a round robin test to compare ASTM D 93 and ASTM D
6450. The correlation between these two methods is without significant bias.
The repeatability and reproducibility is even better for ASTM D 6450 (r = 1.9°C, R = 3.1°C).
3.1.2 Standard method ASTM D7094
In year 2001 a new round robin test was performed to test not only pure substances. There were also contaminated
samples included. The next table shows a few results from the round robin test.
The results of this round robin showed an excellent
correlation between ASTM D 93 and ASTM D 6450 even
for contaminated samples. Since measuring parameters
for ASTM D6450 were slightly changed and a new sample
cup for 2 ml sample had been used a new revision of the
standard was published in year 2004. This revised
standard is called ASTM D7094.
As there is no bias between ASTM D7094 and ASTM D93 A
the following note is part of ASTM D7094.
Based on the sample set used in the 2001 cooperative test program, no statistically significant
bias was observed in the temperature range from 35°C to 150°C between this method and ASTM
Test Method D93 A. The repeatability and reproducibility for D93 A for this sample set (excluding
lube oils) were r=4.1°C and R=6.9°C.
In comparison, the repeatability and reproducibility of ASTM D7094 was r = 4.1°C and R = 5.5°C.
ASTM D7094 repeatability and reproducibility was calculated including lube oils.
For more information on round robin tests and the standard methods ASTM D6450 and ASTM
D7094 feel free to ask the local representative or directly Grabner Instruments.
Sample Method
Substance
Gasoline
D93 A /°C
D7094 /°C
dT /°C
Jet A(1) 0.25% 47.4 47.3 -0.1
Jet A(2) 0.4% 42.9 43.3 0.4
Jet A(2) 0.7% 39.8 39.0 - 0.8
Diesel(2) 0.3% 55.2 55.8 0.5
Diesel(1) 0.5% 47.7 48.4 0.7
repeatability 4.1 4.1
reproducibility 6.9 5.5
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