The A*STAR’s National Metrology Centre (NMC) is the national measurement institute of Singapore, dedicated to advancing measurement science for an innovative and competitive economy
NMC establishes, develops, maintains and disseminates the national measurement standards traceable to the International System of Units, providing key support to a wide spectrum of industry.
Achieving the nation’s highest level of physical measurement through close collaboration with leading national and international organisation.
With a multidisciplinary team of experienced scientists and engineers and state-of-the-art facilities, NMC provides dedicated services to industry partners to meet their specific needs.
NMC believes in working in close collaboration with industry partners, to create values for them and fuel growth for the industry.
The pressure unit is realised based on physical definitions. The pressure value can be calculated from the loading weights over a piston which is so called as deadweight pressure standard or from the mercury density, local gravity and the height displacement distance in a U-tube which is so called as mercury manometer.
NMC standards are classified as:
Low pressure: 1 -13,000Pa
Medium pressure:0.01MPa to 7Mpa
High Pressure: 7MPa-400Pa
Deadweight pressure standard
Pressure reference standards
The realisation of the vacuum standard is based on the principle of dynamic pressure expansion. Vacuum levels can be calculated from the measurement of the pressure ratio across an orifice nozzle and the admitted flow rate.
Vacuum gauges can be calibrated in the range of 10-7 to 10-2 with measurement uncertainty of 1 - 1.3% of readings.
The standard is capable of calibrating high and ultra-high vacuum gauges such as penning gauge, hot cathode ionization gauge etc.
Primary high vacuum standard
Vacuum gauges used for
measurement of high vacuum systems
Reference vacuum standards
The realisation of leak standard is based on ideal gas flow. The flow rate in mole mass (N) is calculated from pressure (P), temperature (T) and volume (V) by the application of gas law N = (P*V)/(R*T), where R is the gas constant value.
Leak flow rate can be calibrated in the range of 1 x 10-12 mol/s to 1x10-6 mol/s with measurement uncertainty of 1% of readings. The standard is capable of calibrating gas leak standards; gas leak detectors; micro-flow meters; flow nozzles; etc.
Primary leak standard
Reference leak standard
Leak standard detectors
The air velocity in the wind tunnel is measured using a laser Doppler anemometer. The speed of small particles flowing with the air in the wind tunnel test section is detected by capturing the frequency of reflected light pulses when the particles pass through the laser fringes.
Air velocity meters can be calibrated in the range of 0.2 m/s to 60 m/s with the measurement uncertainty of 0.05% to 0.5% of reading. The standard is capable of calibrating air velocity standards, thermal anemometer, fan type Pitot tubes etc.
Wavelength of 532 nm;
Continuous output power of 200 mW
Air velocity meters
Air velocity meters used in the marine industry
The primary standard is developed to study novel measurement technology multiphase and high viscosity flow. The system measures and tests flowmeters using the static gravimetric measurement method.
Liquid flow meters can be calibrated in the range of 300 kg/h to 87,000 kg/h with measurement uncertainty of 0.05 %.
The standard is capable of calibrating most types of flow meters.
NMC collaborates with government agencies, manufacturers, and end users to conduct R&D works to explore measurement solutions for liquid flow measurement issues, and also provides consultancy and training on flow measurements.
Liquid flow measurement system
Static gravimetric standard
R&D and Consultancy services
The primary gas flow standards are established to calibrate all kinds of gas flow standards and meters in closed conduits, such as mass flow meter/controller, rotameter, turbine meter, sonic nozzle, ultra sonic flow meter and laminar flow meter, etc.
Gas flow meters can be calibrated with measurement uncertainty of 0.5 % in the low flow range of 1 sccm to 50,000 sccm and mid flow range of 3 to 110 m3.
Low-range primary gas flow standard
High-range primary gas flow standard
Mass flow controller
Ultrsonic flow meter
The primary pressure standard using the large area piston gauges of 35 mm and 50 mm generates precisely known pressure which is derived from loading masses and effective areas of piston & cylinder.
In order to acquire the accurate pressure, the piston and cylinders are precisely characterized. The new standards are capable of performing automatic calibration hence to reduce the possible human interference to the measurement and errors.
The standards are able to calibrate absolute and relative pressure instruments.
Measurement range: 0.01 to 10 MPa
Measurement uncertainty: better than 30 ppm
National Metrology Centre
1 Science Park Drive
T: +65 6279 1900
F: +65 6279 1992/1993
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