Blog

Gas leak detection with bell probe – best practice

07. February 2020

Gas leak detection with bell probe – best practice

– A field test with OLLI and bell probe – Our customers often ask us about the different probes available. While in Germany and the neighbouring countries it is a standard procedure to use carpet probes in urban areas with paved surfaces and the bell probe in unpaved areas, such...

Reading time: 5 min

Author: Bernd Esders

Correlation in our daily work

17. October 2019

Correlation in our daily work

If there is a leak outside the measuring section, the noise must always pass through the entire measuring section. It does not matter how far outside of the measuring section the leak is. If the sound velocity V is entered correctly, the result will always be L = 0.

Reading time: 4 min

Author: Bernd Esders

Introduction – Why we write a blog

14. August 2019

Introduction – Why we write a blog

Dear colleagues and interested parties in the field of measurement technology in gas and water supply! Why do we write a blog? - We are asked the same questions in conversations time and again. Quite often we are asked for our opinion on current topics, such as new and amended regulations.

Reading time: 2 min

Author: Bernd Esders

Remote Detection of Methane – Laser Infrared Spectrometry

08. August 2019

Remote Detection of Methane – Laser Infrared Spectrometry

In active laser infrared spectrometry, a laser beam (measuring laser) is aligned with a facility to be inspected and the reflected portion of the laser beam is evaluated. In a special wavelength range of about 1.635 µm, the presence of methane changes the energy and this can be detected and...

Reading time: 4 min

Author: Bernd Esders

The Principle of Correlation

05. August 2019

The Principle of Correlation

What does correlation mean and how do you find a water leak by using correlation? In water leak detection, correlation describes the measurement of time difference of sound waves via microphones. Leaking water or compressed air from a defective pipe generates a noise. The sound waves generated in...

Reading time: 3 min

Author: Lea Schwenen

Vegetative Leak Detection

02. August 2019

Vegetative Leak Detection

Vegetative leak detection is a method in which the change in vegetation indicates that there is a leak in the immediate vicinity. Although many may not be aware of it, vegetative leak detection is unconsciously part of the assessment of a gas pipe network inspection. I would like to give two...

Reading time: 3 min

Author: Bernd Esders