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FAQ#118 – Is it possible to use the reference reading (zero reading) taken with a digital inclinometer probe as a reference reading for another digital inclinometer probe?

No, this is not possible.
Sisgeo calibrates each probe individually, but each probe has its own small different properties, that have a certain influence on the readings.

The international standard ISO 18674-3, describing the reference reading, states that:
«It is good practice to take an additional reference measurement with an independent probe that can be used as a backup».
The direction suggested by the standard is therefore clear: if you change the measurement probe, you must take a new reference measurement with the new probe.

However, with the KLION inclinometer data management software, Sisgeo offers a possibility to compare data from different probes. The method proposed by KLION can be applied by accepting 3 strong assumptions (see also the KLION software user manual, starting on page 43):
1 – there was no movement between the first measurement with the new probe and the last reading with the old probe, so they can be considered to be coincident.
2 – the international standard ISO 18674-3 considers measurements taken with different probes to be non-comparable.
3 – international publications suggest not using this approach: the correct procedure when starting measurements on an existing inclinometer tube with a new probe is to start a new data analysis and processing by acquiring a new reference measurement.

By accepting these assumptions, it will be possible to apply the ‘new probe’ function.

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Sisgeo Piezometers: Comprehensive Solutions for Groundwater Monitoring

What You’ll Learn:

  • Detailed overview of Sisgeo’s range of piezometer technologies including vibrating wire and electric piezometers, outlining their operating principles, installation methods, and suitability for diverse site conditions.
  • Selection of piezometer filters, emphasizing materials and designs that conform to ISO 18674-4 standards.
  • Integration of piezometer data with automated acquisition systems.
  • Best practices for calibration and maintenance standards.

When:Thu, Jul 31, 2025 3:00 PM – 4:00 PM CEST
Language: English

Sisgeo presents the new MD-Profile IPI with 360° calibration
Discover the next generation of In-Place Inclinometers for geotechnical monitoring!

The new MD-Profile 360° features:

  • new removable pressors available for 3 different tube ID
  • new triaxial calibration over the entire 360° range
  • even stronger connectors

When: 27/05/2025 3:00 PM – 3:30 PM GMT+1
Language
: English