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1. Index
2. CMCS at BRE
3. Development of AMS
4. Non-destructive testing of Marine Jetties
5. Fixed sensor monitoring of Diaphragm walls
6. Monitoring Buildings during Redevelopment
7. Tunnel Monitoring
8. Embankment Systems
9. Loggers
10. Tunnel Distortion Monitoring
11. In-place tilt monitoring system
12. Tunnels Interaction System
13. Re-Development of Small Properties
14. Viaducts
15. DLR at Mansion House
16. Tunnel Monitoring System (Discrete beams)
17. CTRL 240
18. Dams
19. Electro-levels
20. Movement indicators
21. Results of Charing Cross Load Cells
22. Non-destructive testing of concrete structures
23. Radio in Construction Monitoring
24. Settlement Reducing Piles
25. Land Surveying and Total Station Monitoring
26. Vibration Monitoring
27. Monitoring the complete strain history of concrete elements
28. Past CMCS Projects

What is an Electro-level?

Electro-levels (ELs) are devices for monitoring changes in inclination by means of an electrolytic fluid that can move freely relative to three or more electrodes inside a glass or ceramic sealed cavity. The resistance measured between the central and end electrodes depend on the volume of electrolyte between them, which in turn depends on the inclination of the device, see photographs.

The photographs above show +/- 6 degree Fredericks electro-levels as supplied by CMCS to Brazil for use on Dam projects, both in Brazil and China. The change in resistance due to the volume change is used to determine the change in angle through the read out unit. The linearity and sensitivity of the EL depends on the type and amount of electrolyte and the geometry of the tube and the electronic characteristics of the read unit. The power supply from the read/logging unit to the EL must be a.c.

How is it read

The diagram on the left shows the circuit used to read the range of ELs used by CMCS. The electrical resistance of each arm in the circuits is approximately 1000 ohms.

CMCS have a range of read/loggers so that they can best satisfy Customer requirements, including EMC certified units for use on railway systems.