Related Manuals for Geosense VWLSS-200
Summary of Contents for Geosense VWLSS-200
- Page 1 V1.7 January 2021 SETTLEMENT SYSTEMS VIBRATING WIRE LIQUID SETTLEMENT SYSTEM VWLSS-200...
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Page 2: Table Of Contents
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... -
Page 3: Introduction
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. - Page 4 V1.7 January 2021 The Vibrating Wire Liquid Settlement System (VWLSS-200) is available in two options and comprises of the following components:- Plate Mounted VW Settlement Cell Pressure range 70 to 345 kPa Drive-in Settlement Cell Pressure range 70 to 345 kPa Tubing &...
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Page 5: Conformity
Tel: +44 (0)1359 270457 Email: info@geosense.co.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:- •... -
Page 6: Delivery
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. -
Page 7: Storage
( +/- 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 The ‘CHECK Readings WILL be affected by changes in... -
Page 8: Installation
V1.7 January 2021 4.0 INSTALLATION ® The following sections describe some typical installation procedures for Geosense 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. -
Page 9: Installation Of Plate Mounted Sensors
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: Pour a layer of sand upon the surface plane intended for installation of the Settlement Plate, approximately 5 to 10 cm thick. - Page 10 V1.7 January 2021 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.
- Page 11 V1.7 January 2021 10. Then remove the protective cap from the ‘female’ connectors on the settlement cell tubes. To remove the risk of introducing air bubbles into the terminal block, fill this ‘female’ connector with the de- aired liquid BEFORE connecting it to the ‘male’ connector on the terminal.
- Page 12 V1.7 January 2021 Typical Settlement Plate Installation Cables (blue) and Tubes (Black) Prior to placing of protective sand layers below and above. Danger - Risk of damage to tubes Always backfill around buried cable and tubes with ‘stone-free’ material. Typical Terminal Cabinet Fitted with Vented cables / Desiccant Moisture Traps / LINX Data Logger...
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Page 13: Push-In Installations
A special designed pushing adaptor is required to support and push the Settlement Sensors into a borehole. This adaptor is normally manufactured by Geosense and can be fabricated or modified to suit the size of the drilling rods / tubes to which it will be connected. - Page 14 V1.7 January 2021 As rods are added, they are slid over the cable and tubing. In an open hole, care must be taken to maintain light tension on the cable / tubes as the rods are coupled together over the installation. Failure to do so may allow the sensor to drop out of the shoe which could cause it to be damaged when it reaches the base of the hole.
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Page 15: Data Handling
A number of data loggers are available to automatically excite, interrogate and record the reading from Vibrating Wire instruments. These include devices manufactured by Geosense in both single and multi-channel manufacturers of data loggers that can be readily used with Vibrating Wire Settlement Systems. Specific configuration and... -
Page 16: Data Reduction
V1.7 January 2021 Data Reduction Overview The system, essentially, comprises a column of water with the Reservoir at one end and the sensor at the other. If the elevation of the sensor reduces (settlement) and the elevation of the reservoir remains constant (as should be the case), the column of water increases in height. - Page 17 V1.7 January 2021 Geosense Calibration Sheets provide a NEGATIVE (-) Calibration Factor value for Settlement Cells. The equations REQUIRE a POSITIVE (+) Calibration Factor to produce a NEGATIVE value representing Settlement. 5.2.2 Calculation of data for a self compensating, ‘vented’ system.
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Page 18: Typical Calibration Sheet
V1.7 January 2021 Typical calibration Sheet... -
Page 19: Maintenance
If the VW readings appear unusual (see 7.0 Troubleshooting) then it maybe necessary to flush the system. The Vibrating Wire Liquid Settlement System (VWLSS-200) is designed so that if the contained fluid becomes contaminated or a significant number of air bubbles appear, the system can be flushed through and fluid replaced with fresh de-aired Water/Glycol mix. -
Page 20: Troubleshooting
V1.7 January 2021 7.0 TROUBLESHOOTING It is generally accepted that when a Vibrating Wire instrument is producing a stable reading on a suitable readout, the value will be correct. Only on very rare occasions will this be untrue. In almost all cases, a fluctuating reading is a sign of a faulty signal from the sensor. The fault could be in either the sensor, the connecting cable, any switch boxes or the readout. -
Page 21: Specification
V1.7 January 2021 8.0 SPECIFICATION Resolution 0.05% Full Scale (readout dependent) Sensor Accuracy 0.1% Full Scale Thermal Effect Less than 0.02% Full Scale per C ** Thermal Operating Range -20 to + 80 Temperature Sensor Thermistor ( 3kΩ @ 25 Operating Range 7m (standard) - others available upon request Over Range Capacity... -
Page 22: Spare Parts
Civil engineering sites are hazardous environments and instrument cables can be easily damaged, if they are not adequately protected. Geosense can therefore provide the following parts that may be required to effect repairs to instrument cables and tubes. -
Page 23: Return Of Goods
10.2 Packaging and Carriage All used goods shipped to the factory must be sealed inside a clean plastic bag and ® packed in a suitable carton. If the original packaging is not available, Geosense should ® be contacted for advice. Geosense will not be responsible for damage resulting from inadequate returns packaging or contamination under any circumstances. -
Page 24: Limited Warranty
V1.7 January 2021 11.0 LIMITED WARRENTY The manufacturer, Geosense Limited, warrants the Vibrating Wire Liquid Settlement System (VWLSS-200) manufactured by it, under normal use and service, to be free from defects in material and workmanship under the following terms and conditions:- ®... - Page 25 V1.7 January 2021 NOTES...
- Page 26 V1.7 January 2021...
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