It was decided at the EURAMET TC-M meeting in Torino in
2006 to realize a comparison in gauge and absolute
pressure up to 200 kPa as it would allow a link to the
CCM.P-K6 and CCM.P-K2 comparisons to be established. This
project interested a lot of laboratories from the
beginning with 23 participants, 22 of which have
submitted results. The circulation of the transfer
standard began in July 2009 and lasted until January
2012. No major problems occurred during the transport.
The measurand of the comparison is the effective area of
a piston-cylinder determined in gauge and absolute
pressure from 25 kPa to 200 kPa with pressure steps of 25
kPa. The transfer standard is a gas lubricated tungsten
carbide piston-cylinder with an effective area of ~9.8
cm2, fabricated by DH Instruments and compatible with a
PG-7601 pressure balance. Some participants used their
own pressure balance while a pressure balance with a
reference vacuum sensor has been circulated for the
participants not equipped with this system.
One participant (SMU, Slovakia) has never provided the
measurement results and another participant (FORCE
Technology, Denmark) submitted a revised set of
measurement results after the pilot laboratory mentioned
that the equivalence was not met.
After the determination of the reference value, all the
22 participants who delivered the results in gauge
pressure demonstrated equivalence respective to the
reference value on most of the range. In absolute
pressure the equivalence is demonstrated, for all nominal
pressures, by all 17 participants who submitted results.
The comparison is linked to the CCM.P-K6 for gauge
pressure and to CCM.P-K2 for absolute pressure. The link
does not strongly affect the equivalence of the results
and an excellent degree of equivalence is achieved in
gauge and absolute pressure.
- gauge pressure
- absolute pressure
- effective area
- pressure balance
- measurement uncertainty