Humidity - Training Course

Jan  Nielsen

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Humidity - Training Course

Registration and date of the course

Price: 1850 EURO

Humidity is among the most important parameters in connection with measurements related to applications regarding indoor climate and ventilation or storing of food products, industrial and medical gases, textile, paper and many other products requiring a humidity within certain limits. The last 15 years the development of humidity sensors and apparatus has matured to a level where traceable calibration is beneficial to all industries in which humidity and moisture measurement and control are important. This three-day course covers measurement of humidity and calibration of humidity measuring instruments. The emphasis is to ensure that you can apply the techniques and knowledge at your own workplace.

Who should attend?
The course is relevant to any personnel who uses humidity sensing devices as a part of laboratory testing, plant installation or monitoring and maintenance tasks. The course is designed for senior technicians, engineers and technical staff from a wide range of industries as well as calibration and testing laboratories establishing measurement traceability under an ISO quality system.  The course is suitable for participants with or without previous measuring experience. The course curriculum is applicable to both calibration and manufacturing processes. Participants should have a basic level of mathematics: multiplication, division, uses of graphs and tables and be acquainted with GUM uncertainty analysis.

Course content
The course curriculum is based on Danish Technological Institute’s experience in designing test setups, calibration in various fields and as a leading partner in industrial development for Danish and international companies. This experience includes measurement of humidity, flow, pressure, mass and force among others, as well as operation of data acquisition systems.

The course covers the use, practical and theoretical aspects of humidity measurements, calibration and maintenance with emphasis on measurements of relative humidity and dew point. You will learn in detail about the most common instrumentation and about methods and guidelines for calibrations and measurements that you can immediately use at your workplace. The course is designed to be highly interactive to enable you to benefit from the experience of the other participants and the presenters. There will be a number of theoretical examples and exercises during the course as well as hands-on measurements and time is also included to give the participants an opportunity to discuss specific problems. The course includes an exam, a certificate of participation and a certificate of the exam result.

Course Outline


Day one

Day two

Day three

Session 1

Welcome, introduction and definitions. Measuring units.

Dewpoint chilled mirror hygrometer (L+HO)

Calibration of humidity sensors. Climate chambers. Salts (HO+L)

Session 2

Conversion between units. Molliere diagrams (L+TE)

Psychrometers (L+TE)

Calibration of humidity sensors continued. Introduction to one-, two-pressure and flow mixing (HO+L)

Session 3

Computational software (L+TE)

Impedance based hygrometers and other types of hygrometers (L)

Exam, evaluation of course, exam results and goodbye (TE+L)


L – Lecture,  TE – Theoretical exercise,  HO – Hands-on exercise

After the course you will have obtained:

  • Knowledge about concepts for humidity measurements
  • An understanding of the principles of operation of humidity sensors and their instrumentation, especially psychrometers, dewpoint mirror meters and impedance based sensors.
  • An overview of physical principles, treatment of uncertainties, surveying of environmental chambers and issues concerning calibration.
  • The insight needed to identify various sources of error that affect humidity measurements and tips and tricks for recognising the problems.

A comprehensive booklet on the topics is included in the course fee.

Furthermore you will have learned about:

  • Why measurements sometimes do not work out the way you wanted them to
  • Measurement design
  • Making measurements traceable
  • Principles of calibration
  • Assessing the uncertainty in measurements

Why participate?
Air humidity directly affects the moisture content of materials. Poor humidity control affects product quality and weight as well as causing inefficient energy usage. The presence or absence of water influences a vast range of physical, chemical and biological processes, is of widespread importance and can be crucial to product quality, reliability and lifespan. The primary aim of this course is to provide information that enables users to choose the right equipment and methods meeting their needs and to install, use and calibrate their humidity sensing devices correctly. All concepts in the course are treated in a practical and pragmatic matter ensuring direct knowledge to value.