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In the CMCs uncertainty statements, the notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a 2 + b 2]1/2
Unless otherwise stated the expanded uncertainties given below correspond to k = 2 (at a 95 % level of confidence)
Sri Lanka, MUSSD (Department of Measurement Units, Standards and Services)
Pressure ,
Gauge pressure: gas medium
:
500 kPa to 7000 kPa
Instruments for pneumatic pressure measurement
Absolute expanded uncertainty
:
5.6E1 Pa to 3.4E2 Pa
Q[50 , 0.000048] = [(50 Pa)2 + (0.000048*P )2 ]1/2 P = Gauge Pressure in Pa
The Uncertainty is expressed in Pa
Pressure balance
DKD-R 6-1 “Calibration of pressure gauges”, Edition 03/2014
MUSSD, National Metrology Institute of Sri Lanka
Approved on 01 July 2022
CMC ID :
APMP-M-LK-00000NDI-1
Mass ,
Conventional mass
:
0.1 g to 1 g
Weights
Absolute expanded uncertainty
:
1.5E-2 mg to 3.0E-2 mg
Direct comparason in air
Approved on 09 February 2026
Institute service identifier : 1.1.1
CMC ID :
APMP-M-LK-00000QSY-1
Mass ,
Conventional mass
:
1 mg to 100 mg
Weights
Absolute expanded uncertainty
:
6 µg to 1.5E1 µg
Direct comparison in air
Approved on 09 February 2026
Institute service identifier : 1.1.1
CMC ID :
APMP-M-LK-00000QSX-1
Mass ,
Conventional mass
:
10 g to 100 g
Weights
Absolute expanded uncertainty
:
6.0E-2 mg to 0.15 mg
Direct comparison in air
Approved on 09 February 2026
Institute service identifier : 1.1.1
CMC ID :
APMP-M-LK-00000QT0-1
Pressure ,
Gauge pressure: liquid medium
:
0.5 MPa to 200 MPa
Instruments for hydraulic pressure measurement
Absolute expanded uncertainty
:
0.12 kPa to 1.2E1 kPa
Q [0.12 , 0.000062] = [ (0.12 kPa)2 + (0.000062*P)2] 1/2 P= Hydraulic gauge Pressure in kPa
The uncertainty is expressed in kPa
Pressure balance
DKD-R 6-1 “Calibration of pressure gauges”, Edition 03/2014
MUSSD, National Metrology Institute of Sri Lanka
Approved on 01 July 2022
CMC ID :
APMP-M-LK-00000NDJ-1
Mass ,
Conventional mass
:
0.1 kg to 1 kg
Weights
Absolute expanded uncertainty
:
0.15 mg to 1.5 mg
Direct comparison in air
Approved on 09 February 2026
Institute service identifier : 1.1.1
CMC ID :
APMP-M-LK-00000QT1-1
Mass ,
Conventional mass
:
1 kg to 2 kg
Weights
Absolute expanded uncertainty
:
1.5 mg to 3 mg
Direct comparison in air
Approved on 09 February 2026
Institute service identifier : 1.1.1
CMC ID :
APMP-M-LK-00000QT2-1
Mass ,
Conventional mass
:
1 g to 10 g
Weights
Absolute expanded uncertainty
:
3.0E-2 mg to 6.0E-2 mg
Direct comparison in air
Approved on 09 February 2026
Institute service identifier : 1.1.1
CMC ID :
APMP-M-LK-00000QSZ-1
