Continuous
High Accuracy Hydrostatic Levelling System
Continuous measurements
Can be interfaced with optical system
Applications
Stability control and servo-control
of industrial machine
Structure deformation survey in civl engineering
Developed in cooperation with
ESRF, F-Grenoble, and patented, the HLS system is dedicated
to high accuracy levelling between two different ponts
which can several hundred meters apart. Based on the
communicating vessels principle, the
system uses the free surface of a liquid as an absolute
measurement reference. Each point of the network is
equipped with a sensor that measures the vertical distance
between the electrode and the altimetric reference plane.
Measurement quality and accuracy are obtained thanks
to our capacitive sensors and electronics. This equipment
is available in two versions, one "high accuracy"
version and one HLS-DE version which allows high amplitude
measurements.
Hydraulic network
The
hydraulic network is composed of the following items:
- Vessels that materialized the measurement points,
connected to one another
- By pipes that ensure hydraulic connection and atmospheric
pressures equilibrium at the different measurement points.
Various accessories are available to build up the network:
control and filling/purging device (manual or automatic),
connections, manual or automatic taps, interface plates
...
The design and the creation of a hydraulic network have
a primordial influance on the global accuracy of the
system. Our team stays at your disposal so as to define
the network that best suits to your project.
Measurement chain
The measurement chain is composed
of:
- Capacitive levelling sensors (HLS)
- Multi-systems and multi-channels rack(s) for power
supply and interface with PC
- Connecting cable
- TAP-EBC rack(s) and a hydraulic network control system
- Hydraulic network (valves, pumps, pipes ...)
- MSM software allowing to process measurements
Features of the HLS sensors
(high accuracy version)
Entirely
made of stainless steel, the sensor is equipped with
a reference base that can bear the Taylor Hobson 3.5"
sphere or an alignment scale equipped with a spheric
reference base; a combined levelling with HLS and optical
sensors is thus possible.
A temperature proble inserted in each vessel allows
to carry out corrections on measurements.
Usually integrated in the sensor head, the electronics
can be placed in an industrial box that can be located
up to 100 meters away from the sensor.
This optionbecomes a necessity in the case
of strong radiation damage or strong magnetic field.
The electronics allows to carry out:
- A distance measurement: the output voltage (0-10V)
is directly proportional to the liquid height inside
the vessel.
- A temperature measurement: a temperature probe measures
the liquid temperature at each measurement point of
the network. The output voltage (0-10V) is directly
proportional to the temperature.
| References |
HLS.xxx
2.5 |
HLS.xxx
5 |
HLS.xxx
10 |
HLS.xxx
15 |
| Measuring
Range (mm) |
2.5 |
5 |
10 |
15 |
| Sensor
resolution |
±
0.2 |
±
0.5 |
±
1.5 |
±
2.5 |
These features are the most common;
upon request, we can manufacture the sensors suited to
your application
- Operating
temperature: -10 up to +50°C
Application example
- In labotatory and for large machine used by physicists:
continuous levelling of girders or any other structure
that must be very accurately aligned
- In industry: continuous identification of calibration
benches, of control, positionning or accurate assembling
of production lines, tables ...
- In civil engineering: continuous control and survey
of structures such as dams, historic buildings, nuclear
power stations, qulifying of induced by natural events
dur to our planet life (ground sinking, daily or seasonal
thermal effects, tectonic motions, ground waters level
variation ...)
Order refernce: HLS.xxx
yy / T1- T2
xxx=
STD for integrated electronics, REM for electronics placed
in a industrial box (plus length in meters of cable between
sensors and electronics)
yy for measuring range
T1-T2 for the lowest and the highest temperatures
FOGALE nanotech also offer
complete solutions:
Topographic and metrologic engineering, topometric and
metrologic computation, installation and bringing into
service of the system, personel training and maintenance |
