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NMISA maintains a realisation of Coordinated Universal Time (UTC), called UTC (ZA), for South Africa, Eswatini & Lesotho. The current time is :  

South African Standard Time (SAST) is defined as UTC + 2 hours. The current time is : for South Africa, Eswatini & Lesotho. The current time is :


NMISA's Temperature & Humidity Section has internationally recognised expertise and facilities aimed at improving the practical measurement of temperature and humidity. We help establish and maintain the International Temperature Scale of 1990, ITS-90. For the safe and effective operation of industrial processes, accurate measurement of temperature and Humidity is crucial. We support industrial measurements through a wide range of activities including research, industrial partnerships, consultation, and training.

We support industrial measurements through a wide range of activities including research, industrial partnerships, consultation, and training. We offer calibrations against the South African National Standards that are validated through international co​mparisons. We provide cost-effective, impartial, quality assured solutions: from everyday measurements to those at the extremes of sensing technology, such as temperatures above 2000 °C, or humidity in an extreme range. We work with a variety of sectors including aerospace, manufacturing, space, medical and pharmaceutical​

Key Fac​​ts

The kelvin, unit of thermodynamic temperature, ​is defined by fixing the numerical value of the Boltzmann constant k to 1.380 649×10−23 J⋅K−1. This unit is equal to kg⋅m2⋅s−2⋅K−1

Relative humidity (RH) is a ratio, expressed in percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated at the same temperature.​​

How we can help y​​ou

The Section offers measurement, calibration, training ​​and consultation services as listed below:

  • Calibration of contact thermometers from -196 °C to 1555 °C:

    • ​​platinum resistance thermometers (PRTs) can be calibrated from -196 °C to 660 °C.

    • thermistors from 0 °C to 60 °C.

    • thermocouples from -80 °C to 1555 °C and

    • liquid-in-glass thermometers from -25 °C to 280 °C.

  • ​​Calibration of infrared radiation thermometers from 0 °C to 1600 °C and blackbody radiation sources from 0 °C to 2000 °C.

  • Traceability for contact thermometry is obtained from thermometric fixed point cells from the triple point of argon (Ar) (-189.344 2 °C) to the freezing p​oint of copper (1084.62 °C). (Pt-Rh thermocouples are calibrated at the melting point of palladium (1553.5 °C) using the wire-bridge method.

  • Development of calibration methods and transfer traceability to industry and African NMIs.

  • Dissemination of temperature scales by calibration of temperature sensors. 

  • Provide a link between the African region and the rest of the world's NMIs through comparison measurements in temperature and humidity.

  • Fixed points calibration of standard platinum resistance thermometers from Ar to Al points.

  • Calibration of other contact thermometers in the temperature range from -80 °C to 1600 °C.

  • Fixed point calibration of thermocouples in the temperature range from Sn to Pd points.

  • Calibration of surface thermometers in the temperature range from 0 °C to 450 °C.

  • Calibration of radiation thermometers and blackbody radiation sources from 0 °C to 2000 °C.

  • Calibration of hygrometers, saturated salt solution and humidity related measuring equipment from 5 %rh to 95 %rh.

  • Calibration of dewpoint meters from -75 °C to +70 °C.

  • Calibration of water activity meters from 0,05 aw to 0,95 aw.

  • Traceability for radiation thermometry is obtained from contact thermometers up to 500 °C and from a spectrally characterised monochromatic radiation thermometer calibrated at the freezing point of silver (961.78 °C) or copper (1084.62 °C) from 600 °C.

  • Temperature and Humidity metrology practical training to industry and African national metrology institutes.

  • Provide training through internships and bursary programmes.

  • Supports fair trade, by underpinning an internationally respected measurement infrastructure in South Africa.​

Development of National Standards

  • Primar​​​y traceability for contact thermometry

  • The national measurement traceability for ear radiation thermometers

  • Radiation​ thermometry and black body source measurement in the sub-zero temperature range

  • The national measurement traceability for Thermal imager

The T​​eam

​​Name and Surname
​Designation​ ​Email ​Telephone
​Dr Nonhlanhla Precious Maphaha 
Section Head: Temperature and Humidity​​

+27 ​12 947 2832​
Regina Mnguni
​Metrologist: Temprature &: ​​Humidity
​+27 12 947 2856
Yanga Ntolosi
Scientist (Temperature & Humidity)
+27 12 947 2896
​Dr Efrem Kebede Ejigu
Scientist: Humidity & Thermometry
+27 12 947 2748
​​Matome Maloba​

Scientist / Engineer Thermometry

Temperature and Humidity

​+27 12 947 2806
​Dorothy Segwatibe​Scientist : Temperature and Humidity
+27 12 947 2744


  • S​​ANAS Specialised Technical Committee (STC) meetings every year

  • AFRIMETS Technical committee meeting every year

  • APMP Technical committee meeting every year

  • CCT Technical committee meeting every two years​


Please use the following information ​​to contact us.