Project dunamet no d36
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Project DUNAMET no. D36. Tomáš Valenta Czech Metrology Institute. Project DUNAMET no. D36. the inter-comparison among Czech Republic ( CMI ) Austria ( BEV ) Hungary ( OMH ) and Slovak Republic ( SMU ) took place from May 2004 to August 2004

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Project DUNAMET no. D36

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Project dunamet no d36

Project DUNAMET no. D36

Tomáš Valenta

Czech Metrology Institute


Project dunamet no d361

Project DUNAMET no. D36

  • the inter-comparison among

    Czech Republic (CMI)

    Austria (BEV)

    Hungary (OMH)

    and Slovak Republic (SMU)

  • took place from May 2004 to August 2004

  • the inter-comparison of low pressuretest facilities for gas meters in the range from 100 m3/h to 1000 m3/h


Project dunamet no d362

Project DUNAMET no. D36

The axial turbine gas meter G650 was used for the comparison.

Manufacturer: PREMAGAS

(ELSTER –AMCO Group)

Type: DAE

Size: G650

DN150


Project dunamet no d363

Project DUNAMET no. D36

Calibration procedure:

The turbine gas meter G650 was tested in each laboratory by air in horizontal position.

It was necessary to use the upstream straightening pipe that was long at least 5x DN and the downstream straightening pipe that was long at least 3x DN.

The reference pressure from the turbine gas meter was measured from the output “pr”.


Project dunamet no d364

Project DUNAMET no. D36

The reference temperature from the turbine gas meter was measured in the distance (23)x DN downstream of the turbine gas meter.

The HF pulse emitter A1S(the pulse number 4579,88 pulses/m3) was used for the tests.

The calibration had to be performed in the laboratory where the temperature was from 19,5°C to 23,5°C. No oil lubrication was used.


Project dunamet no d365

Project DUNAMET no. D36

The turbine gas meter was tested in 8 flow rates:

1000 m3/h, 800 m3/h, 650 m3/h, 500 m3/h, 400m3/h, 300m3/h, 200 m3/h, 100 m3/h.

Error of the meterwas determined. The Erroris value which shows the relationship in percentage terms of the difference between the volume indicated by the meter and the volume which has actually flowed through the meter, to the later value.

where E is the error of the meter

Vi is the indicated volume by the meter (m3)

Vc is the real volume which has actually flowed through the meter (m3)


Project dunamet no d366

Project DUNAMET no. D36

Determination of the reference value

To determine the reference value tree different approacheswere used.

Mean:Mean is the arithmetic average of a set of numerical data.

Median:Median is the middle value of an ordered set of numerical data.

Weighted mean error (WME):

If in a series of observations a statistical weight (1/u2) is assigned to each value, a weighted mean y can be calculated by the formula:

where

xi are values of errors of meter in different laboratories in one flow rate

u (xi) are uncertainties U(k=2) of errors of meter in different laboratories in one flow rate


Project dunamet no d367

Flow ratein the meter

Mean

Median

Weighted mean error (WME)

m³/h

%

%

%

1000

-0,17

-0,14

-0,18

800

-0,03

0,01

-0,03

650

0,01

0,05

0,02

500

0,02

0,03

0,03

400

-0,03

-0,04

-0,03

300

-0,03

-0,05

-0,03

200

0,15

0,12

0,14

100

0,93

0,91

0,93

Project DUNAMET no. D36

Results:


Project dunamet no d368

Project DUNAMET no. D36

Austria (BEV)


Project dunamet no d369

Hungary (OMH)

Project DUNAMET no. D36


Project dunamet no d3610

Project DUNAMET no. D36

Slovak Republic (SMU)


Project dunamet no d3611

Project DUNAMET no. D36

Czech Republic (CMI)


Project dunamet no d3612

Project DUNAMET no. D36

Conclusion:

All participants were successful. All determined errors of meter with their uncertainties U(k=2) in every flow rate cover the reference values Mean, Median and Weighted Mean Error.


New euromet project

New EUROMET project

THIS PROJECT CAN BE REPEATED AMONG EUROMET COUNTRIES IN 2006.

Note: I would like to coordinate quick and simple inter-comparison. That is why the supposed time to make calibration and to deliver the meter to next laboratory will be only 1 week.

The form „PROPOSEDEUROMET PROJECT“

will be sent to everybody by e-mail.


Please don t applause because mr lojek is sleeping thank you for attention

Please don´t applause because Mr. Lojek is sleeping. Thank you for attention.


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