Chemical Metrology

Chemical Metrology Laboratory has been producing primary gas standards using the gravimetric method and gas standard verification according to ISO 6142-1, ISO 6143-2001, ISO 17034:2016 and ISO/IEC 17025. We are able to prepare and verify binary and multi gas component mixtures in different concentration ranges. These gas mixtures can be used for calibrating reference standards used for indoor & outdoor air quality, car & ship emissions, and industry emissions. Some common gases mixtures include methane (CH4), carbon dioxide (CO2), carbon monoxide (CO), argon (Ar), oxygen (O2), propane (C3H8), nitrogen (N2), and sulphur dioxide (SO2).

Services provided:

• Verification of gas mixtures concentration

Ground-level ozone concentration is an important air quality parameter which is monitored and reported worldwide. Chemical Metrology Laboratory has established and maintained a Standard Reference Photometer (SRP) as our primary ozone standard. Our SPR has participated at the ongoing key comparison BIPM.QM-K1 and compared well with other national primary ozone standards from different National Metrology Institutes, including National Institute of Standards and Technology (NIST), National Physical Laboratory (NPL).  The operating principle of SRP is based on UV photometry and has been designed for the production and measurement of ozone concentrations in air up to 500 nmol/mol.

Services provided:

• Calibration of ozone analysers

We have developed gas detector and analyser calibration capability. Our report is compliant to iso 17025. Our measurement is traceable to our gas mixture standards and SI unit. Our gas mixture include O2/N2, CO2/N2, CH4/N2, C3H8/N2, etc.

Services provided:

• Calibration of gas detectors and gas analysers

Chemical Metrology Laboratory has developed the capability of purity analysis for pure gases like nitrogen, oxygen, helium, carbon dioxide, carbon monoxide, methane and propane by using Gas Chromatography - Flame Ionized Detector (GC-FID) and Gas Chromatography - Pulsed Discharged Helium Ionization Detector (GC-PDHID). The core impurities analysis includes nitrogen, oxygen, hydrogen, helium, carbon dioxide, carbon monoxide, methane and other hydrocarbons. The low detection limits (LDL) of core impurities are 50 ppb of nitrogen, oxygen, hydrogen, helium, carbon dioxide, carbon monoxide, and 100 ppb of methane and other hydrocarbons.

Services provided:

• Purity analysis of pure gases
  

Chemical Metrology Laboratory has developed airborne particle count measurement capabilities for calibration of counting efficiency of particle counters which is used for air quality and clean room monitoring. The coverage is for 0.3 - 5 micron in particle diameter, with expanded uncertainty of 4% - 9%. Our report is compliant to ISO 17025. Our measurement in particle counting is traceable to SI unit. We has also developed facilities for microparticle size and shape measurement for airborne, liquid-borne and powder samples, and the capabilities in single nanoparticle mass and density measurement for liquid samples.

Services provided:

• Calibration of counting efficiency of particle counters
• Particle size and shape measurement
• Single nanoparticle mass and density measurement

Chemical Metrology Laboratory is also proactively working on the development of new measurement methods and solutions, including water quality measurement (total organic carbon, chemical oxygen demand, microplastics, and etc.), food nutrition detection and measurement, packaging material testing (polymer degradability, particle leaching, gas penetration and etc.), and additive manufacturing powder and parts measurements (Density of 3D printed parts, Powder flowability, and etc.)

Services provided:

• Improved Archimedes method for density measurement of 3D printed parts
• Bio-degradation measurement of soluble and insoluble polymers