Geosense VWLSS-200 Bedienungsanleitung
V1.7 January 2021
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VIBRATING WIRE
LIQUID SETTLEMENT SYSTEM
VWLSS-200
SETTLEMENT SYSTEMS
2
V1.7 January 2021
CONTENTS
1.0 INTRODUCTION
1.1 General description
2.0 CONFORMITY
3.0 DELIVERY
3.1 Packaging
3.2 Handling
3.3 Inspection
3.4 Storage
4.0 INSTALLATION
4.1 Preparation for Installation
4.2 Installation of Plate Mounted Sensors
4.3 Push-in Installations
5.0 DATA HANDLING
5.1 Monitoring the Settlement System Readings
5.2 Data reduction
5.3 Typical Calibration Sheet
6.0 MAINTENANCE
7.0 TROUBLESHOOTING
8.0 SPECIFICATION
9.0 SPARE PARTS
10.0 RETURN OF GOODS
11.0 LIMITED WARRANTY
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V1.7 January 2021
1.0 INTRODUCTION
This manual is intended for all users of Vibrating Wire Liquid Settlement System
(VWLSS-200) manufactured by Geosense and provides information on its installation,
operation and maintenance.
1.1 General Description
The Vibrating Wire Liquid Settlement System (VWLSS-200) is used to monitor
settlement or heave in soils and other structures such as embankments, earth & rockfill
dams. A typical installation is shown in Figure 1, below.
The main components are a fluid reservoir, liquid filled tubing and a vibrating wire
pressure transducer, mounted on a plate or, for a borehole application, attached to an
anchor.
The vibrating wire sensor is positioned at a point where settlement is to be detected. The
pressure sensitive side of the sensor is connected to a reservoir, located on stable
ground, by two liquid-filled tubes to create a continuous fluid column. As the sensor
settles with the surrounding ground, the height of the column is increased and the
corresponding higher pressure is detected by the sensor. Settlement or heave is
calculated by converting the liquid pressure registered by the sensor, into metres of liquid
head. The sensor is fitted with a 4 core cable to obtain the pressure and temperature
readings.
Each sensor contains a Thermistor for the temperature measurement, and gas discharge
tubes for lightning protection. The system uses de-aired solution of antifreeze and water
to prevent freezing and algae growth. The system uses two liquid lines so that it could be
flushed to remove air bubbles from the system.
The effects of changes in atmospheric pressure are removed by either using a vented
transducer or mathematically, using information from another sensor.
It is VITAL that personnel responsible for the installation and
use of this Settlement System, READS and UNDERSTANDS
this manual, prior to working with the equipment.
Height of the column of liquid
increases as the cell moves down
with the settlement of the ground
The VW transducer cell
measures the pressure of the col-
Single or multiple
liquid reservoir(s)
Liquid filled tubing
Figure 1
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V1.7 January 2021
The Vibrating Wire Liquid Settlement System (VWLSS-200) is available in two
options and comprises of the following components:-
OR
Plate Mounted VW Settlement Cell
Pressure range 70 to 345 kPa
Drive-in Settlement Cell
Pressure range 70 to 345 kPa
Tubing & Cable
Twin tubing with over sheath
PUR coated, 4 core screened cable
Lengths cut to suit individual requirements
Header Reservoir
Available for single and multiple Settlement
Cells (up to 10).
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V1.7 January 2021
2.0 CONFORMITY
Geosense Ltd
Nova House
Rougham Industrial Estate
Rougham, Bury St Edmunds
Suffolk , IP30 9ND
United Kingdom
Tel: +44 (0)1359 270457
Email: [email protected].uk, Web: www.geosense.co.uk
Declaration of Conformity
We Geosense Ltd at above address declare under our sole responsibility that the Geosense products
detailed below to which this declaration relates complies with protection requirements of the following
harmonized EU Directives:-
• Electromagnetic Compatibility Directive (EMC) 2014/30/EU
• Restriction on Hazardous Substances Directive RoHS 3 (EU Directive 2015/863)
Equipment description Vibrating Wire Liquid Settlement System
Make/Brand Geosense
Model Number VWLSS-200
Compliance has been assessed with reference to the following harmonised standard:
EN 61326-1:2006 Electrical equipment for measurement, control and laboratory use.
EMC requirements. General requirements.
A technical file for this equipment is retained at the above address.
January 2021
Martin Clegg
Director
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V1.7 January 2021
3.3 Inspection/functionality
It is vital to check all the equipment in the shipment as soon as possible after taking
delivery and well before installation is to be carried out. Check that all the
components that are detailed on the documents are included in the shipment.
Check that the equipment has not been physically damaged.
If components are missing or damaged, contact the delivery company or Geosense.
Although the system is not connected to the reservoir, a functional check can still be
carried out by connecting the VW Sensor Cable to a VW Readout, typically as in
picture.
Prior to carrying out function checks, ensure that the Settlement System has been
stored in a ‘reasonably stable’ temperature for at least 2 hours.
3.0 DELIVERY
This section should be read by all users of Vibrating Wire Settlement Systems
manufactured by Geosense®
3.2 Handling
Whilst they are a robust devices, Geosense® Vibrating Wire Liquid Settlement
Systems are precision measuring devices. They and their associated equipment
should always be handled with care during transportation, storage and installation.
Once the shipment has been checked (see below), it is recommended that
Settlement Systems remain in their original packaging for storage or further
transportation.
Cable and tubing should be handled with care. Do not allow them to be damaged by
sharp edges (rocks for example) and do not exert force on them as this may damage
the internal conductors or cause leaks and rendering the instruments useless.
3.1 Packaging
Geosense® Vibrating Wire Liquid Settlement Systems (VWLSS-200) are
appropriately packed for transportation to site. Packaging is suitably robust to allow
normal handling by transportation companies. However, inappropriate handling
techniques may cause damage to the packaging and the enclosed equipment. The
packaging should be carefully inspected upon delivery and any damage MUST be
reported to both the transportation company and to Geosense® .
Calibration Sheets contain VITAL information about the
piezometer. They MUST be stored in a safe place.
Only COPIES of calibration certificates should be taken to site
The original certificates should be stored safely.
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V1.7 January 2021
3.4 Storage
All equipment should be stored in an environment that is protected from direct
sunlight.
It recommended that cables be stored in a dry environment to prevent moisture
migrating along the cable in the unlikely event of prolonged submersion of exposed
conductors.
Storage areas should be free from rodents as they have been known to damage
connecting cables and tubing.
No other special requirements are needed for medium or long-term storage although
The displayed values of the VW sensor reading and temperature, should be
reasonably stable ( +/- 3 full digits ) for this check. Ensure body, plate and tubing are
stationary.
The elevation of the Geosense® factory is +60 metres above sea level and
barometric pressures change with altitude by approximately 1.2kPa per 100 metres
3.3 Inspection/functionality contd….
To carry out the check, connect a Vibrating Wire readout
As follows:-
RED =VW +
BLACK =VW -
GREEN =Temp
WHITE =Temp
Record the values (and units) displayed on the readout
together with the pressure transducer serial numbers.
The “CHECK” readings should coincide with the factory zero
on the calibration sheet (see the example calibration sheet in Section 9) within +/- 50
digits after barometric and temperature corrections are made.
The ‘CHECK Readings WILL be affected by changes in
atmospheric pressure and temperature changes.
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V1.7 January 2021
4.0 INSTALLATION
The following sections describe some typical installation procedures for Geosense® VW
Settlement Systems.
This section of the manual is intended for all users of Vibrating Wire Settlement Systems
manufactured by Geosense® and is intended to provide guidance with respect to their
installation.
It must be remembered that no two installations will be the same and it is inevitable that
some ‘fine tuning’ of the following procedures will be required to suit specific site
conditions.
4.1 Preparation for Installation
When installing more than one System Plate / Body, record the assigned unique
identifying code for particular positions (remembering to ensure that the System
fitted with the longest cables are selected for the most distant installations).
Ensure there will be enough cable and tubing to route it to the intended readout /
monitoring location. The location of the Reservoir need not be the same as the
electrical termination, but it is commonly so.
The elevation / location of the Settlement System installations should be identified
by the Engineer responsible for the interpretation of the data, or as detailed on
contract drawing or in the specification.
It is important to consider the protection of the Reservoir when selecting a suitable
location. It should be remembered that Reservoir and connecting tubes must be
protected from damage as they are sensitive and vulnerable. In some locations it
will be necessary to install protective sleeves or enclosure.
The function of the system should be checked prior to installation as described in
section 3.3. Check the system using a readout with the audio function switched on.
A clear ‘ping’ should be produced.
It is preferable to install the terminal panel and reservoir prior to installing the
settlement cells. This allows for simple connection and testing, prior to backfilling
over the cells and tubing.
It is VITAL that personnel responsible for the installation and
use of the Settlement System READ and UNDERSTAND this
manual, prior to working with the equipment.
**********
As stated before, it is vital to check all the equipment in the shipment soon after
taking delivery and well before installation is to be carried out. Check that all
components that are detailed on the shipping documents are included.
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V1.7 January 2021
4.2 Installation of Plate Mounted Sensors
For a Liquid Settlement System (VWLSS-200)
supplied with the plate option, use the following
guide:
1. Pour a layer of sand upon the surface plane
intended for installation of the Settlement Plate,
approximately 5 to 10 cm thick.
If the subsurface includes voids, a layer of geotextile
material should be placed under the sand to prevent
it migrating into the voids.
2. Spread out the sand and flatten to create a
compacted, smooth layer.
3. Place the Settlement Plate onto the sand layer with
the VW Transducer uppermost. Use a small spirit
level to ensure the plate is level. Putting force only
on the plate itself, firmly push the metal plate into
the sand, twisting slightly from side to side to ensure
that good contact is made.
4. Starting from the centre, pour a cover layer of sand
over the entire Settlement Plate, approximately 5 to
10 cm thick.
5. This is now a good time to do a final CHECK on the
function of the equipment, before completing the
backfill.
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V1.7 January 2021
6. Connect the VW Cell Sensor Cable to a readout and
confirm the sensor is producing a reading. (At this
stage the value is not important but it should not
fluctuate too much).
To perform a simple functional check, note the
reading on the display and then, with the readout still
connected, raise the coupling end of the liquid filled
tubing by about 1 metre.
Observe the ‘Digits’ / ‘B units’ / ‘Frequency’ value on
the readout and it should be reducing as the tube is
raised and increasing again when it is lowered.
7. Install the Terminal Panel & Reservoir.
It is highly recommended that the terminal cabinet is
installed and commissioned prior to backfilling the
plate locations and cable trenches.
The terminal panel and reservoir should be mounted
outside the settlement area, with sufficient weather
protection to minimise any temperature fluctuations in
the liquid.
8. BEFORE connecting the tubes from the settlement
cells to the reservoir connector block, partly fill the
reservoir with the de-aired liquid (supplied in separate
bottles).
With the reservoir partly filled, remove the transport
plugs from inside the reservoir, using a screwdriver or
socket spanner.
(In the photo - liquid removed for clarity)
9. Prepare to connect each pair of tubes from the
settlement cells to the connector block. To do this,
first remove the protective covers from the ‘male’
connectors on the terminal block.
These are arranged in pairs (front and back) for each
cell.
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