Pressure

The Laboratory is equipped with pressure balances, pressure controllers and precision quartz Bourdon pressure gauges to provide pressure calibration services.

The Laboratory can provide oil pressure calibration services in the gauge mode from 0.5 MPa (5 bar) to 140 MPa (1,400 bar) for pressure gauges, transducers and pressure transmitters. The Laboratory can also provide gas pressure calibration services in both absolute and gauge modes from 1 kPa (0.01 bar) to 7 MPa (70 bar).

The submitted instrument should be in a clean condition.

For gas pressure calibration, the pressure medium will be nitrogen.

Calibration is generally performed by applying pressures of known values to the unit under test in sufficient number of steps (normally about 7) distributed throughout its usable range, from lower test values to maximum calibration value, and then decreased backwards to initial test value.

Electronic barometer can also be calibrated by this Laboratory, provided that the electronic barometer has a connection for input pressure. Calibration is performed at five points from 800 hPa to 1100 hPa under both rising pressure and falling pressure conditions.

The pressure connections of the submitted instruments should be as follows :

N.P.T.	B.S.P.	A.P.I.	Metric
1/8 in	1/8 in	1/8 in	M12 x 1.5
1/4 in	1/4 in	1/4 in	M20 x 1.5
3/8 in	3/8 in	3/8 in
1/2 in	1/2 in	1/2 in

Calibration charges

	Fee in HK$
Pressure gauge.	$3270
Pressure transducer or transmitter.	$3270
Electronic barometer.	$3060

 

Enquiry Telephone: (852) 2829 4835

e-mail: tkchan@itc.gov.hk