Geosense VWLSS-200 Installation Manual Download Page 1

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V1.7 January 2021

VIBRATING WIRE

LIQUID SETTLEMENT SYSTEM

VWLSS-200

SETTLEMENT SYSTEMS

Summary of Contents for VWLSS-200

Page 1: ...V1 7 January 2021 I N S T R U C T I O N M A N U A L VIBRATING WIRE LIQUID SETTLEMENT SYSTEM VWLSS 200 SETTLEMENT SYSTEMS ...

Page 2: ...rage 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 ...

Page 3: ...f 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 lightni...

Page 4: ...wing 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 ...

Page 5: ...otection 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 Elec...

Page 6: ...s 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...

Page 7: ...le 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 disp...

Page 8: ...llations 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 ...

Page 9: ...ng 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 cent...

Page 10: ...ed 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...

Page 11: ...ble from each cell must be terminated so as to enable gathering of the settlement data Termination can take many forms from a simple connector panel for a portable readout through stand alone data loggers to remotely accessed data recording modules 14 Excess tubing should be coiled and buried in a shallow pit close to the terminal panel to protect it and reduce the affects of temperature changes o...

Page 12: ...k of damage to tubes Always backfill around buried cable and tubes with stone free material Cables blue and Tubes Black Prior to placing of protective sand layers below and above Typical Terminal Cabinet Fitted with Vented cables Desiccant Moisture Traps LINX Data Logger ...

Page 13: ...o push the Settlement System into the base of the borehole the Settlement Cell cable and tubing must remain inside the rods to protect them They cannot be attached to the outside of the drilling rods as the installation is inserted into the borehole Any preliminary borehole may be cased or un cased The final installation procedure will need to be created to include the following variations and bas...

Page 14: ...ush the Settlement Sensor beyond its intended location without applying any driving force 9 When the sensor is in its intended position slowly withdraw the pushing rods and adaptor taking care to allow the tubing and cable to pass through the rods freely as the rods are withdrawn AGAIN Never rotate the lower rods when removing the rods This could cause the cable or tubing to become twisted and cou...

Page 15: ...readout following the wiring colour code Conductor colours may vary depending upon the extension cable used RED VW BLACK VW GREEN Temp WHITE Temp 2 Press the On Off button to switch the unit on Press it again to acquire a reading from the connected instrument 3 The readout displays the Vibrating Wire readings in both Frequency in Hz and Linear B Digits in Hz2 1000 Temperature reading in both resis...

Page 16: ...n Initial reading from the Current reading and multiplying it by a Sensor Constant Having recorded the Initial VW reading and Temperature after the installation has stabilised all subsequent readings can be referred to these values Use the Initial VW Reading as Ro and the Initial Temperature value as To The effects of changes in atmospheric pressure can be significant and are removed by either usi...

Page 17: ...17 C and Barometric pressure B0 of 1012 mb Current VW Reading RC is 7530 Digits at sensor temperature TC of 15 C and Barometric pressure of 1025 mb Calibration sheet shows 0 002324m Digit for CF and 0 010512 m C for TK ΔR RC R0 7530 7905 375 Digits ΔT TC T0 15 17 2 0 C ΔB BC B0 1012 1025 13 mb Settlement 0 002324 375 0 010512 2 0 0102 13 1 037 0 8715 0 021 0 1326 1 037 0 692 m From the above sampl...

Page 18: ...18 V1 7 January 2021 5 3 Typical calibration Sheet ...

Page 19: ... general maintenance is sufficient for the remainder of the above soil System consisting mainly of visual checks every 2 3 months for Ensure the reservoir level is up to the overflow tube top up if necessary Connection tubes are still firmly in place and sealed The fluid tubes are clean and clear Wiring connections are in good order Where Vented transducers are employed the desiccant beads in the ...

Page 20: ...t 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 The best way to fault find an instrument is to isolate it from all other instruments and connections ...

Page 21: ...Thermistor 3kΩ 25o C Operating Range 7m standard others available upon request Over Range Capacity Range 20 Excitation Pluck or Swept Frequency Standard Range 7 17 metres Sensor accuracy 0 1 full scale System accuracy Site dependent Resolution 0 025 full scale Temperature range 20 C to 80 C MODEL DESCRIPTION VWPS 201V VW vented pressure sensor 70 kPa VWPS 202V VW vented pressure sensor 140 kPa VWP...

Page 22: ...s 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 PU coated 4 Core Sensor cable with foil shield and copper drain PVC coated armoured 4 Core cable suitable for direct burial Epoxy jointing kit for forming a waterproof cable joint Tub...

Page 23: ...ir being carried out A set charge for inspecting the equipment and providing an estimate is also chargeable 10 1 2 Warranty Claim See Limited Warranty Conditions This covers defects which arise as a result of a failure in design or manufacturing It is a condition of the warranty that the Vibrating Wire Strain Gauge must be installed and used in accordance with the manufacturer s instructions and h...

Page 24: ...ed for 1 year from the date of shipment from the manufacturer to the purchaser The warranty is limited to replacement of part or parts which are determined to be defective upon inspection at the factory Shipment of defective part or parts to the factory shall be at the expense of the Purchaser Return shipment of repaired replaced part or parts covered by this warranty shall be at the expense of th...

Page 25: ...25 V1 7 January 2021 NOTES ...

Page 26: ...26 V1 7 January 2021 ...

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