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V1.4 March 15

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NATM STRESS CELLS

VWNPC-3000

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Summary of Contents for VWNPC-3000

Page 1: ...V1 4 March 15 I N S T R U C T I O N M A N U A L NATM STRESS CELLS VWNPC 3000...

Page 2: ...11 5 1 3 Radial cell VWNPC 3010 13 5 1 4 Initial readings 14 5 2 Re pressurising the cell 14 5 3 Cable 16 5 3 1 Cable installation 16 5 3 2 Cable marking 16 5 4 Tools 16 6 0 DATA HANDLING 17 6 1 Moni...

Page 3: ...equency of the alternating current can then be readily converted to a fluid pressure by applying individual calibration factors Frequency signals are particularly suitable for the demanding environmen...

Page 4: ...rmal to the plate is balanced by a corresponding build up of internal fluid pressure which is measured by the sensor 4 Mounting lug provided at each corners of the cell body to fix the cells in place...

Page 5: ...nd hence the need for a rapidly applied layer of shotcrete The graph below shows the ground reaction curve which is the amount of support needed versus the amount of inherent support and ground deform...

Page 6: ...tic Compatibility Directive 2014 30 EU Restriction on the use of certain Hazardous Substances RoHS2 2017 2102 EU Waste electrical electronic equipment WEEE 2012 19 EU Equipment description Vibrating W...

Page 7: ...15 3 0 MARKINGS Geosense NPC 3000 NATM Cells are labelled with the following information Manufacturers website telephone number Product type Pressure range Model Serial number Cable length CE mark Max...

Page 8: ...ll users of Geosense NPC 3000 NATM Cells 4 2 Handling Whilst they are a robust devices Geosense NPC 3000 NATM Cells are precision measuring instruments They and their associated equipment should alway...

Page 9: ...The RST readout logger unit Model Number VW2106 displays the readings in Linear digits See Section 6 of this manual for more information on units and conversion routines Prior to carrying out a Zero R...

Page 10: ...weight Ideally they should be stored in their original packaging but if not do not stack units on top of each other or any other item that could damage the sensor or connecting pipework from the cell...

Page 11: ...table that some fine tuning of the following procedures will be required to suit specific site conditions 5 1 2 Tangential cell VWNPC 3000 Typical installation is by using short pieces of steel rebar...

Page 12: ...out location which typically is a junction box The cable is terminated inside this box Sufficient cable should be coiled inside the box to allow it to be pulled out and connected to a portable readout...

Page 13: ...any air bubbles or spaces between the cell and the ground STEP 8 carefully bend the pressure tube so that it will protrude out of the shotcrete lining STEP 9 tie to the re bars using soft iron wire co...

Page 14: ...the special crimping tool Check the readings on the readout as the tube is crimped If there is a relatively large gap between the cell and the surrounding concrete each crimp will result in a small va...

Page 15: ...pressure decrease in digits Crimp number GRAPH 1 a gradual increase in pressure occurs showing that there is initially little contact between the cell and the concrete As the cell starts to become in...

Page 16: ...om accidental damage caused by moving equipment This is best done by putting the excess cable inside a junction box Cables may be spliced to lengthen them without affecting gauge readings Waterproof s...

Page 17: ...olours may vary depending upon the extension cable used Commonly these are RED VW BLACK VW GREEN Temp WHITE Temp 2 Switch on the unit and where necessary select range B 3 The readout displays the Vibr...

Page 18: ...on integrated circuits Period Units represent the time taken for the wire to vibrate over one full oscillation expressed in seconds Due to the very small size of the number generated most equipment ma...

Page 19: ...the reading is in Linear Digits Hz2 1000 Where this is not the case the reading should be converted to these units prior to application of the calibration factors For most applications this equation i...

Page 20: ...the readout used to display the transducer output R O Cal Date The date on which the Readout was calibrated to a traceable standard Applied Pressure Pressure applied to the transducer as part of the...

Page 21: ...21 V1 4 March 15 6 3 Calibration certificate...

Page 22: ...ncy or period STEP 2 Convert the readings as follows A Digits Digits x K pressure Where Digits Current digit reading base digit reading Hz2 x 10 3 Hz2 x 10 3 K Linear calibration factor obtained from...

Page 23: ...arried out to allow any temperature compensation to be made It is recommended that a control cell or cells depending on the size of the project are installed in a non stressed environment so that the...

Page 24: ...43 342 2 83 107 9 123 77 66K 36 8006 4 1363 44 331 5 84 105 2 124 72 81K 35 7618 5 1310 45 321 2 85 102 5 125 68 30K 34 7252 6 1260 46 311 3 86 99 9 126 64 09K 33 6905 7 1212 47 301 7 87 97 3 127 60...

Page 25: ...g 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 senso...

Page 26: ...20 to 80 o C 10 0 SPARE PARTS Geosense NPC 3000 NATM Cells are sealed units and there are no replaceable parts Civil engineering sites are hazardous environments and instrument cables can be easily da...

Page 27: ...epair being carried out A set charge for inspecting the equipment and providing an estimate is also chargeable 11 1 2 Warranty Claim See Limited Warranty Conditions This covers defects which arise as...

Page 28: ...ch 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 o...

Page 29: ...29 V1 4 March 15 NOTES...

Page 30: ...30 V1 4 March 15...

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