High Precision Electrolevel Tiltmeter TILT 2000

Applications

The instrument has been specifically designed as a substitute for the pendulum or to be additional to it, where the use of pendulums is not possible, either due to cost or due to suitability of the structure. The tiltmeter is a viable alternative, both from a technical and economic point of view.

The instrument is also used for measuring deformation in very tall and slender structures.

Among its multiple applications are:

• Dams
• Bridges
• Viaducts
• Minarets
• Towers
• Chimneys
• Skyscrapers
• Walls
• Other

Features and Benefits

The tiltmeter TILT2000 was designed and built to pass a series of functional tests in particular regarding electrical and environmental conditions; as proof, various tests were performed on a sample of instruments and briefly summarized below:

Tests in climatic chamber

The behavior of the instrument was monitored in varying temperatures and constancy of behaviour and return to initial values were tested. The following tests were performed:

1. thermal cycles in climatic chamber as required by standard CEI 50-3
2. change in temperature and humidity cycle (not referable to normalized cycles). In both cases, measurements at the beginning and at the end of the cycles were taken, taking as reference measurements made with our bubble level clinometer (range 60 ‘, precision 2 “).

The instruments showed constant behavior and an excellent return to initial values at the end of the cycle; there is still however the need during the installation phase, to make provision to protect the group with insulation and to take appropriate precautions to minimize the effect of temperature during normal monitoring..

Fatigue test

We checked the behavior of the instrument when subjected to fatigue testing through sinusoidal vibrations.

The tests were performed according to CEI 50-6, test Fe.

The fatigue tests were carried out in 20 sinusoidal vibrations cycles in two directions (vertical and horizontal in the direction of measurement), in scanning 2-100 Hz, with severity:

• 0.75mm peak amplitude in the 2-9Hz range
• 0.2g (1.96 m / sq) of peak acceleration in 9-100Hz range

For tests of insensitivity to vibrations, we carried out two readings for each examined frequency: 1, 2, 5, 10, 55 Hz, for the vertical direction; 0.5, 1, 2, 5, 10, 20, 30, 55 Hz, for the horizontal direction. This with the above severity.

During tests, the average values experienced deviations generally lower than 1% F.S. with the exception of tests at 10 Hz where more significant changes to measurements were detected (10%).

There was no evidence of loosening of the instrument or mechanical damage at the end of the fatigue tests.

Electromagnetic compatibility tests (ref. ENEL GLI-EMC) insulation Impulse (GLI 01) – Severity level: 3

• Common mode application: Outcome OK
• Differential mode application: Outcome OK (The impulse is cutoff due to the presence of transient suppressors mounted between the two test circuit terminals)

The test was performed in common mode excluding the protective devices.

Immunity to transients with high energy content (GLI 08)

• Level of severity: 3

Test performed with output signal of about 12 mA (equivalent to a 0 ‘inclination)

• Common mode application: Outcome OK
• Differential mode application: Outcome OK

Transient immunity muted with f = 0.1MHz and F = 1MHz (GLI 0.4)

• Severity level: 3

Test performed with output signal of approximately 12mA (equal to a 0 ‘inclination) (common mode) to f = 0.1MHz: Outcome OK

• Power circuit: Outcome OK
• Signal circuit: slight influence; e%=1.56 differential mode f = 0.1MHz: Outcome OK
• Power circuit: Outcome OK
• Signal circuit: Outcome OK(common mode)to f = 1MHz: Outcome OK
• Power circuit: Outcome OK
• Signal circuit: slight influence; e%=0.69 to f = 1MHz: Outcome OK
• Power circuit: Outcome OK
• Signal circuit: slight influence; e%= 0.25%

Immunity to series of sinusoidal waves in low voltage with f = 0.01 to 1 MHz (0.6 GLI)

• Severity level 3.

Test performed with output signal of approximately 12mA (equal to a 0 ‘inclination).

• Power circuit: Outcome OK
• Signal circuit: Outcome OK
  During the preliminary test in variable frequency, there were slight variations of signal frequency around 70kHz and 450KHz.

Note

The slight variations occuring, during the application of the disturbance were such that the signal variation does not trigger alerts and/or alarms.