technical protocol for gulfmet.m.p-s1 digital pressure ...€¦ · the final report will form the...

Technical Protocol for GULFMET.M.P-S1 Digital Pressure Gauge Comparison in Gas Pressure in the Range of 0.7 MPa to 7 MPa

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TECHNICAL PROTOCOL

for GULFMET.M.P-S1

Digital Pressure Gauge Comparison in Gas

Pressure in the Range from 0.7 MPa to 7 MPa

TÜBİTAK UME

(Rev. 1)

February 21, 2017


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Contents

Contents 1. Introduction ................................................................................................................................... 3

2. Transfer Standard.......................................................................................................................... 3

2.1. Stability of Transfer Standard .................................................................................................. 5

3. Participant Laboratories ................................................................................................................. 5

4. Time Schedule .............................................................................................................................. 5

5. Transportation ............................................................................................................................... 6

6. Measurement Quantities and Points................................................................................................ 6

7. Calculation of the Comparison Reference Value .............................................................................. 6

8. Measurement Procedure ................................................................................................................ 6

8.1. Unpacking, handling, and care of the standards ....................................................................... 6

8.2. Measurement Method and Instructions .................................................................................... 7

9. Measurement Uncertainty .............................................................................................................. 8

10. Evaluation of Results and Report ................................................................................................ 8

10.1. Reporting Results................................................................................................................... 8

11. Final Report of the Comparison................................................................................................... 9

12. References .............................................................................................................................. 11

ANNEX 1* .......................................................................................................................................... 12

ANNEX 2* .......................................................................................................................................... 13


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1. Introduction

Interlaboratory comparisons are significant tools for the test/calibration laboratories to

assuring the quality of test and calibration results. Accredited laboratories and other

laboratories that operate a quality management system for their working areas are

expected to join into multi-participant intercomparisons in certain time periods to show

and assure their service quality. Interlaboratory comparisons are conducted for a number

of purposes. Determining the performances of individual laboratories for some specific

tests or measurements and to monitor laboratories’ continuing performances [1].

The comparison is planned to organize on Gas Pressure in gauge measurement mode

from 0.7 MPa up to 7 MPa. A paroscientific digital pressure gauge is selected as a

transfer standard. The comparison has been registered to GULFMET and BIPM

database as GULFMET.M.P-S1 which is piloted by TÜBİTAK UME. The pilot laboratory

is responsible for preparing the measurement instructions, checking the stability of the

transfer standard, analysing the results and preparing the final reports.

2. Transfer Standard

The transfer standard will be provided by TÜBİTAK UME.

Transfer standard is Paroscientific 745-1K Digital Pressure Gauge (Serial No: 114944)


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Figure 1. Transfer standard is a Paroscientific 745-1K Digital Pressure Gauge

The general specification of 745-1K is presented in Table 1.

Table 1. The general specifications of 745-1K

Name Digital Pressure Gauge

Measurement Range 0 – 1000 psia

Manufacturer Paroscientific, Inc.

Model No 745-1K

Serial No 114944

Pressure Connection NPT 1/4″ female

Pressure Media (operates with) Gas (nitrogen)

Transfer Standard Package

Including List

1. Paroscientific digital pressure gauge with NPT1/4″

female pressure adaptor (please try to use this

adaptor and do not remove it)

2. Battery charger (main power adaptor)


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2.1. Stability of Transfer Standard

In order to monitor the stability of the transfer standard characteristics during the comparison, UME

will perform intermediate calibrations. Circulation scheme of transfer standard is presented in

Table 2. In order to take into account a possible drift of the transfer standard, the instability of the

transfer standard will be evaluated. Since the drift rate can be different during the comparison time,

the instability will be evaluated in each loop and applied to the results of participants.

3. Participant Laboratories

The pilot institute of the comparison is TÜBİTAK UME (Turkey). The contact details of the

coordinator are given below:

Pilot Institute: TÜBİTAK Ulusal Metroloji Enstitüsü (UME)

Coordinator : Dr. Yasin Durgut

Tel: +90 262 679 50 00 (5200)

Fax: +90 262 679 50 01

E-mail: [email protected]

The participating institutes and contact persons with their addresses are presented in Table 2.

Table 2. Participants

Country Institute Acronym Shipping Address Contact Person

Turkey TÜBİTAK

Ulusal Metroloji Enstitüsü

TÜBİTAK UME

TÜBİTAK Ulusal Metroloji Enstitüsü (UME)

TÜBİTAK Gebze Yerleşkesi

Barış Mah. Dr. Zeki Acar Cad. No:1

41470 Gebze-Kocaeli, TURKEY

Yasin Durgut

[email protected] Tel: +90 262 679 50 00

4. Time Schedule

The measurements with the transfer standard should be performed strictly in accordance with the

schedule given below. In the case of not foreseeable problems which may require a change of the

schedule its amendment will be suggested and agreed with the participants and the pilot

laboratory. Measurement schedule is given in table 3.


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Table 3. Circulation Time Schedule

Acronym of Institute

Country Estimated

Starting Date Time for measurement

and transportation

TÜBİTAK UME Turkey 01.06.2017 30 days

5. Transportation

For transportation, the instrument is packed in a special case.

A courier service can be used for transportation. Hand-carrying to the next participant is also

possible.

Each participant is responsible for the costs of sending the instrument to the next laboratory.

6. Measurement Quantities and Points

The quantities to be measured and the measurement points are given in Table 4.

Table 4. Measurement quantity and points

Quantity Measurement Points

Pressure (Gas)

(0, 0.7, 1.4, 2.1, 2.8, 3.5, 4.2, 4.9, 5.6, 6.3, 7.0) MPa

7. Calculation of the Comparison Reference Value

The Comparison Reference Value (CRV) for each measurement point will be calculated using the

results of the pilot institute.

8. Measurement Procedure

8.1. Unpacking, handling, and care of the standards

When the transfer standard arrives at the participating laboratory the transfer standard should be

checked for any damage and missing items. A full set of items is described in Table 1.

Participants shall send an e-mail to the pilot laboratory ([email protected]) notifying

about:

mailto:[email protected]


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Name of Laboratory

Date of receipt of the transfer standards by the laboratory

If any physical damage of the standards, in particular scratches and rust on transfer

instrument is available or not

If there is any missing item in the package

After finishing the measurements, transfer standard should be packaged carefully. When

dispatching the package, each participant has to give the transportation details to the next

participant and to the pilot laboratory. Each participant is responsible for the costs of sending the

instrument to the next laboratory as detailed in measurement schedule in Table 3.

8.2. Measurement Method and Instructions

Latest, twenty-four hours before starting the measurements, test instrument should be

placed at the same place with the reference instrument where measurements will be

carried out.

Test instrument should be connected to the main power supply and switched on by

pressing the ON/OFF button for warming up and stabilization for two (2) hours before the

measurement.

Three (3) preloading exercises up to 7 MPa (full scale) should be done before

measurement. Waiting time at the full scale is one (1) minutes and waiting times between

preloading are two (2) minutes during the preloading exercises. Please see Figure 1.

After preloading exercises finished, wait for 5 minutes for stabilization before measurement.

Make the instrument zero. At the beginning of each cycle, the instrument should be zeroed.

Following steps are done to zero the instrument:

Press “Menu” button. Use arrow keys to choose “Tare Menu” and enter. Use arrow keys

and choose “Tare” and enter. Now it’s written ‘’updating’’. After this procedure, the test

instrument displays zero. Also, refer to user manual if necessary.

Each participant should carry out 3 calibration cycles. Each cycle should be conducted in

an ascending, and then descending sequence of ten (10) pressure points. Comparison

scheme is given in Figure 1. Nominal pressure points for comparison measurement are

0 MPa, 0.7 MPa, 1.4 MPa, 2.1 MPa, 2.8 MPa, 3.5 MPa, 4.2 MPa, 4.9 MPa, 5.6 MPa,

6.3 MPa and 7 MPa.


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At each calibration point, after loading the nominal pressure, wait for thirty (30) seconds for

the stabilization and follow the test display for 15 seconds and take the test reading after

reading is been stabilized.

The resolution of test standard is adjusted into 1 millibar.

Measurements will be done in gauge mode.

Measurements should be done at environmental conditions of temperature (20 ± 1) °C and

relative humidity (50 ± 25) %rh.

Place the transfer instrument in a horizontal position. Connect the transfer standard to the

reference standard. Try to adjust height difference between the test and the reference

standards as close to zero as possible.

Environmental conditions that affect measurements should be noted and reported together

with results.

Figure 2. Comparison Measurement Scheme

9. Measurement Uncertainty

The uncertainty of measurement must be calculated according to Guide to the Expression of

Uncertainty in Measurement (GUM) document [2].

All contributions to the measurement uncertainty should be listed in the report submitted by each

participant.

10. Evaluation of Results and Report

10.1. Reporting Results

Important Remark: After measurements have been done, each participant should prepare

and sent to pilot laboratory Annex 1 and Annex 2 in two weeks.

Annex1 includes the following information.


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Participant laboratory information

Notes of inspection of the package (e.g. Damages, any problems)

Reference instrument information (manufacturer, model, serial no, measurement

range, traceability information, uncertainty)

A detailed description of how the measurements were performed (general procedure, a

schematic/photo of the experimental set-up, the duration of the temperature stabilization at

(20 ± 1) °C etc.).

Date of receipt and dispatch of the transfer standard

Dates of measurements

Measurement environmental conditions (temperature, relative humidity, atmospheric

pressure)

Annex 2 is for reporting measurement results in the frame of the comparison. While Annex 1 is

asked to be sent preferably in Word format, Annex 2 is asked to send in Excel format.

11. Final Report of the Comparison

The pilot institute is responsible for the preparation of a comparison report. The draft version of

the comparison report will be issued within two months after receiving the participant report by the

pilot institute. The draft report will be sent to the participants for discussion and approval. This

draft will be confidential to the participants. The participants will have one week to send their

comments on Draft Report. After revisions if available and approval of the Draft Report, it will be

published as the Final Report. The Final Report will form the basis for the publication of results.

Comparison results will be evaluated according to the En value which is calculated by Equation

(1) stated at ISO/IEC 17043 “Conformity assessment — General requirements for proficiency

testing” [1] standard.

(1)

xlab: Participant laboratory measurement result,

xref: Pilot laboratory measurement result,

Ulab: Participant laboratory measurement uncertainty,

Uref: Pilot laboratory measurement uncertainty

22reflab

reflab

n

UU

xxE


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The laboratory measurement results will be utilized according to the En criteria. The treatment of

the results based on the value of En will be made in the following way:.

If │En│≤ 1 then it is successful

If │En│> 1 then it is unsuccessful


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12. References

[1] ISO/IEC 17043 “Conformity assessment — General requirements for proficiency testing”,

International Standardization Organization”, 2010

[2] Guide to the Expression of Uncertainty in Measurement (GUM), September 2008


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ANNEX 1*

*Annex1 should be prepared in MS Word format and sent by e-mail to pilot laboratory within

2 weeks after the measurements.

Participant laboratory and its full address

Contact person name, e-mail, phone

Notes of inspection of the package (e.g. Damages,

missing items any problems)

Reference

instrument

information

Manufacturer

Model

Serial no

Measurement range

Traceability information

A detailed description of how the measurements

were performed

(general procedure, a schematic/photo of the

experimental set-up, the duration of the temperature

stabilization at (20 ± 1) °C etc.).

Date of receipt of the transfer standards by laboratory

Date of dispatch of the transfer standards from

laboratory

Date of measurements

Measurement

environmental

conditions

Temperature (°C)

Relative humidity (%rh)

Atmospheric pressure (hPa)


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ANNEX 2*

*Annex2 should be prepared in MS Excel format and sent by e-mail to pilot laboratory within 2

weeks after the measurements

CALIBRATION RESULTS

Nominal Pressure

/MPa

Reference Pressure

/MPa

Test Pressure

/MPa

Error

/MPa

u(ref)

/MPa

u(r)

/MPa

u(fo)

/MPa

u(b)

/MPa

U

/MPa

0

0.7

1.4

2.1

2.8

3.5

4.2

4.9

5.6

6.3

7.0

7.0

6.3

5.6

4.9

4.2

3.5

2.8

2.1

1.4

0.7

0

Remarks for Annex 2

Nominal Pressure Nominal pressure value in MPa in increasing and decreasing directions

Reference Pressure Reference pressure value in MPa

Test Pressure Test pressure value displayed by transfer standard in MPa

Error Error value in MPa.

It is calculated as (test pressure-reference pressure)

u(ref) Reference instrument standard uncertainty (k=1)

u(r) Test instrument resolution standard uncertainty (k=1)

u(fo) Zero error standard uncertainty (k=1)

u(b) Repeatability standard uncertainty (k=1)

U (e) Expanded measurement uncertainty (k=2)

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