MEMS BEAM SENSOR User Manual
Contents
1. Sensor can be read bv most commerciallv available Dataloggers however Soil Instruments can supplv a fullv built and configured Datalogger with an enclosure custom logging program and a varietv of communications options from a simple direct link to satellite modem Please refer to datasheet D1 Dataloggers for more details Whatever the chosen reading method the sensor wiring remains the same The cable has four conductors and a shield The shield is not connected at the sensor end of the cable and so should be connected to ground at the Datalogger for maximum resistance to induced voltages and interference The sensor is a differential device therefore a high and low reading must be taken The conductor colour codes are detailed in the following table Take extreme precaution when wiring the MEMS Beam Sensor to ensure the conductors are correctly wired into the Datalogger especially the red power conductor and all ofthe output conductors Always wire the sensor with the power switched off CONDUCTOR COLOUR IDENTIFICATION Red EPowert 10 1VDO o Back Ground a Signalhigh A o Barewire Screen drain The sensors are supplied with a 4 core cable with a polyurethane jacket FUNCTION TEST LOGGER PROGRAMMING Itis recommended to carry out a function test of the sensors immediatelv after installation at zero degrees tilt the sensor output is approximately 0 VDC Once all the sensors have been wired in2. Spacer washer Expanding Shell Anchor Standard nut Metal washer 11 Part Il MEMS Beam Sensor Installation Guide Contents This section contains the following topics TOPIC SEE PAGE Smart MEMS Beam Sensor Installation Standard MEMS Beam Sensor Installation 14 Installing a MEMS Beam Sensor o Seb Follow the precautions outlined in this manual at all times to ensure the correct working order of your instrument It is essential that the equipment covered by this manual is handled operated and maintained by competent and suitably qualified personnel To guide you in the competence required for installing each instrument in our product range Soil Instruments provide you with a recommended skill level in all of our manuals and datasheets Soil Instruments recommend an intermediate skill level for installing a MEMS Beam Sensor The nominal beam length will have been specified at the time of ordering The beam gauge length will be displayed on the sensor product label SMART MEMS To install a Smart MEMS Beam Sensor follow the steps outlined below BEAM SENSOR INSTALLATION O ILL nn u nn ee 1 Hold the beam up against the structure to be monitored with a spirit i level along the top face level and mark the centre of each end fitting i gt Remove the beam and drill two holes to approximately 60mm depth i Once the hole has been drilled remove the excess dust from the
3. next using an inter connecting cable with a plug connection at the end which attaches to the opposing socket mounted within the next beam Once the chain is complete the final cable attaches to a connection box A four core armoured cable then connects the connection box back to a Datalogger Fork end fixing Protective housing Slot end fixing MEMS Sensor Inter connecting plug Cable Inter connecting socket CONNECTION BOX The Smart Beam Sen connection box sor incorporates a cable and plug which connects each beam to the next culminating in either a left or right hand Right Hand Connection Box CANbu Cable connector Left Hand Connection Box s terminating plug Flexible cable gland gland ing plate STANDARD MEMS The Standard MEMS BEAM SENSOR Both sensors are avai Plastic Once installe no zero level adjustm length that is individual Beam Sensor is supplied with a specified cable y wired into a Datalogger able in either aluminium or GRP Glass Reinforced d the sensors are ready to take measurements ent is required Fork end fixing Protective housing Slot end fixing Xx Cable MEMS Sensor ANCHOR KIT The anchor kit supplied by Soil Instruments has either an expanding shell M10 anchor or a groutable M10 anchor Groutable Anchor IRA Standard nut Metal washer Lock
4. the following topics TOPIC SEE PAGE Connection Box Standard MEMS Beam Sensor Introduction Important Information The following symbols are used throughout this manual A 0 9 0 WARNING PRODUCT CHANGES WARRANTY DISPOSAL IMPORTANT QUESTION INFORMATION Important Failure to adhere to the warnings in this manual may result in network disruption and possible data loss Failure to observe the warning may result in injury product malfunction unexpected readings or damage to the product that may invalidate its warranty Tips give additional information that may be helpful when using a MEMS Beam Sensor Soil Instruments Limited has an on going policy of design review and reserves the right to amend the design of their product and this instruction manual without notice Please refer to Soil Instruments Limited terms and conditions of sale for warranty information Batteries are a consumable item and are excluded from any warranty Products marked with the ma symbol are subject to the following disposal rules in European countries e This product is designated for separate collection at an appropriate collection point Do not dispose of as household waste e For more information contact Soil Instruments Limited or the local authority in charge of waste management Svstem Description Things Vou Need to Know about MEMS Beam Sensors FEATURES e Inter connecting Smart Senso
5. 000 173 65 0 00 0 00 8 0 1965 0 8 000 0 000 139 17 0 00 0 00 1475 0 5 999 0 001 104 52 0 01 984 0 4 000 0 000 69 75 0 00 492 0 2 000 0 000 34 90 0 00 i 0 002 0 002 0 03 0 03 493 0 2 001 0 001 34 91 0 01 985 0 4 001 0 001 69 78 0 03 1475 0 5 998 0 002 104 50 0 03 1965 0 8 001 0 001 139 19 0 02 2452 0 10 000 0 000 173 64 0 01 Conversion Factors m 7 Polynomial Factors Polynomial Factors mV to mm m mV to ArcDegrees bo 3 124421E 02 bo 1 797461E 03 b 7 087928E 02 b 4 061018E 03 b 1 027741E 08 b 5 937535E 10 b 1 250341E 11 b 2 729550E 12 Conversion Formula Displacement Current Reading Initial Reading Reading by biX b X b3X where X is the raw sensor data in mV Wiring Code Red 12V Supply Black Ground White Signal High Green Signal Low The instrument detailed hereon has as applicable been tested and calibrated in accordance with procedures which are part of our 1509001 2008 Quality Management System and unless otherwise indicated performs within 0 5 as specified Thus the instrument conforms in all respects to our relevant specifications and drawings Certified By Line Manager SUPPORT www itmsoilsupport com 44 0 1825 765044 soil INSTRUMENTS Bell Lane Uckfield East Sussex t 44 0 1825 765044 e info soil co uk TN22 1QL United Kingdom f 44 0 1825 744398 w www soil co uk Soil Instruments Ltd Registered i
6. and require no zero level adjustment Each sensor incorporates an on board microprocessor which performs an automatic temperature compensation ofthe tilt g data delivering reliable accurate and stable data The data can be directly imported into our web based monitoring software providing a near real time tilt data that is constantly updated and available to view from any PC or mobile device with an internet connection Contents PARTI OVERVIEW Introduction Important Information Product Changes Warrantv Disposal Svstem Description Things Vou Need to Know about MEMS Beam Sensors Features Benefits Applications Svstem Description Svstem Components Smart MEMS Beam Sensor Connection Box Standard MEMS Beam Sensor Anchor Ki PART Il MEMS BEAM SENSOR INSTALLATION GUIDE Installing a MEMS Beam Sensor Smart MEMS Beam Sensor Installation Wiring Table Standard MEMS Beam Sensor Installation PART III STANDARD MEMS BEAM SENSOR WIRING amp PROGRAMMING GUIDE Wiring the Standard MEMS Beam Sensors Overview Wiring Table Function Test Logger Programming Data Reduction PART V APPENDICES Appendix A Sample Installation Record Sheet Appendix B Sample Calibration Certificate oOo 0 DO 0 0 0 0 0 00 OQ ES SR ES yey ws iS Wer Wey ni Ss IDI 24 26 26 26 27 DI 28 30 32 33 PRECISELY MEASURED instrumentation and monitoring Part Overview Contents This section contains
7. ce 27 28 If in any doubt please contact Soil Instruments support for advice The performance of the sensors as calibrated is not guaranteed unless the above protocols are used Soil Instruments can supply full logger programs and wiring diagrams at an extra cost please contact Soil Instruments support for details DATA REDUCTION he MEMS Beam Sensor is calibrated over 10 arc degrees approximately 175mm metre and has a DC voltage output dependant on tilt The calibration certificate supplied with the sensor contains the following information Instrument Type e Serial Number e Range e Calibration Data both raw and reduced e Conversion Formula e FS Error at each calibration point e Wiring Code Please refer to Appendix B Sample Calibration Certificate in this manual for more details The MEMS Accelerometer chip used in the Beam Sensor is calibrated for temperature as part of the micro machine manufacturing process by the chip manufacturer As well as the MEMS tilt element the sensor contains a microprocessor and a look up table to applv correction for temperature changes to the silicon substrate within the sensing element Soil Instruments has no control over this process other than bv the QA procedures followed bv the chip manufacturer which specify the correction and rejection criteria The sensor output is therefore corrected automaticallv for the effects of temperature on the ac
8. celerometer chip Soil Instruments do not offer the sensor with an on board temperature sensor If temperature measurement is desired then a separate temperature sensor must be installed additional to the Beam Sensor PartV Appendices Contents This section contains the following topics TOPIC SEE PAGE i Appendix A Sample Installation Record Sheet 32 i Appendix B Sample Calibration Certificate 33 31 Appendix A Sample Installation Record Sheet i Location Sensor Serial Gauge i number number length Appendix B Sample Calibration Certificate soil INSTRUMENTS Bell Lane Uckfield East Sussex t 44 0 1825 765044 e info soil co uk TN22 1QL United Kingdom fi 44 0 1825 744398 w wwwsoil co uk Soil Instruments Ltd Registered in England Number 07960087 Registered Office 3rd Floor 17 Hanover Square London W1S 1HU Sensor Type Fibreglass MEMs Beam Date 01 Oct 2014 Model No 2188 120 1 Ambient Temp 21 0 C Range 10 Degrees Serial No FMB8878 Calibration Rotary Table S N JP60 29 Calibrated By J Dean Equipment S N 5226 Traceable to National Standards Calibrated Data Position Degrees Polynomial mm m Polvnomial Raw Data Full Scale DI mV free ArcDeg non SEES mm non Error FS ogren Polynomial conformance TORONA conformance Displacement Displacement 10 0 173 65 2453 0 10 000 0
9. e is too deep you will need to drill a new hole that is the correct depth ACTION Thread and secure an M10 nut on both anchors followed bv a metal i washer On the first anchor that will accept the end beam add two spacer i washers with the inserts facing each other followed by a metal i washer and an M10 lock nut STEP ACTION 16 i On the second and subsequent anchors add two spacer washers with i the inserts facing each other then add the further two spacer washers in the same manner so the second and third washers are back to back i followed by a metal washer and an M10 lock nut i 7 Slide the left hand fork of the first beam between the two spacer i washers so the fork is resting on the inserts of the washers d 8 i Place the right hand slot fixing of the beam over the anchor between E i the second set of spacer washers so the slot is resting on the inserts i of the washers Place the fork end of the second beam between the i first two spacer washers as before and repeat this process for all the i subsequent beams STEP ACTION e 9 Once the chain installation is complete repeat step 2 for the final i fixing of the end beam The nvlock nut should be tightened so that the beams including the end Beam do not rattle around but vou should be able to move them back and forth with a small amount of force STEP ACTION E 10 i Cabl
10. e tie the sensor cables to the beam leaving a suitable amount of e i slack at the joints to allow for movement E 11 i Check with a spirit level that both horizontal axis of the beam are i i level i e both along and across the beam it may be necessary to i loosen the large bolt which attaches the end fitting to the beam by i approximately one turn and rotate the beam to achieve the level i Once level carefully re tighten the end fitting bolts 112 Install the Datalogger within a reasonable distance of the MEMS Beam Sensor using suitable fixings for the medium it is to be attached to is Wire the MEMS Beam Sensors into the Datalogger i Please refer to Part III Standard MEMS Beam Sensor Wiring and i programming Guide in this manual for more details Take extreme precaution when wiring the MEMS Beam Sensor to ensure the conductors are correctly wired into the Datalogger especially the red power conductor and all of the output conductors Always wire the sensor with the power switched off Part Ill Standard MEMS Beam Sensor Wiring amp Programming Guide Contents This section contains the following topics TOPIC SEE PAGE Wiring the Standard MEMS Beam Sensors 26 Wiring the Standard MEMS Beam Sensors OVERVIEW WIRING TABLE Follow the precautions outlined in this manual at all times to ensure the correct working order of vour instrument The Standard MEMS Beam
11. hole 3 i Install the chosen anchor type A If using an expanding shell anchor insert and set with a setting tool If using a groutable anchor grout and wait the required time for setting with quick set adhesive such as Hilti HIT HY 150 this is approximately thirty minutes at 20 C Take every precaution to ensure that the hole is drilled straight into the structure and not at an angle to it 15 16 Before drilling the hole measure the length of the shell anchor against the drill bit and mark the bit with tape to ensure vou drill the whole to the correct depth Make sure the hole is drilled to the correct depth to receive the anchor If the hole is too shallow remove the anchor and carefully re drill to the sufficient depth If the hole is too deep vou will need to drill a new hole that is the correct depth e A 4 i Thread and secure an M10 nut on both anchors followed by a metal washer 5 Onthefirstanchorthatwill accept the end beam add two spacer i washers with the inserts facing each other followed by a metal washer and an M10 lock nut STEP ACTION 16 i On the second and subsequent anchors add two spacer washers with i the inserts facing each other then add the further two spacer washers in the same manner so the second and third washers are back to back i followed by a metal washer and an M10 lock nut 7 Slide the
12. left hand fork of the first beam between the two spacer i washers so the fork is resting on the inserts of the washers Fu 78 i Place the right hand slot fixing of the beam over the anchor between i the second set of spacer washers so the slot is resting on the inserts of the washers Place the fork end of the second beam between the i first two spacer washers as before and repeat this process for all the i subsequent beams Once the chain installation is complete repeat step 2 for the final i fixing of the end beam 17 STEP ACTION i 10 i When all the beams within the chain are installed connect each beam i to the next using the inter connecting plug ensuring the connection is fully tightened a The nylock nut should be tightened so that the beams including the end Beam do not rattle around but you should be able to move them back and forth with a small amount of force STEP ACTION llli i Check with a spirit level that both horizontal axis of the beam are level i e both along and across the beam it may be necessary to loosen the large bolt which attaches the end fitting to the beam by approximately one turn and rotate the beam to achieve the level Once level carefully re tighten the end fitting bolts 12 Install the Datalogger within a reasonable distance of the MEMS Beam E Sensor using suitable fixings for the medium it is to be attached to onnect the CANbus ter
13. minating plug to the last beam in the array 14 Connect the MEMS Beam Sensor into the connection box then connect the armoured cable using the following wiring table WIRING TABLE ARMOURED CABLE CONNECTION BOX DATALOGGER SIM CONDUCTOR COLOUR SW Power SW Power Brown STANDARD MEMS To install a Standard MEMS Beam Sensor follow the steps BEAM SENSOR outlined below INSTALLATION ALCA A 1 Hold the beam up against the structure to be monitored with a spirit i level along the top face level and mark the centre of each end fitting gt Remove the beam and drill two holes to approximately 60mm depth i Once the hole has been drilled remove the excess dust from the hole H If using an expanding shell anchor insert and set with a setting tool If using a groutable anchor grout and wait the required time for setting with quick set adhesive such as Hilti HIT HY 150 this is approximately thirty minutes at 20 C 19 20 Take everv precaution to ensure that the hole is drilled straight into the structure and not at an angle to it Before drilling the whole measure the length of the shell anchor against the drill bit and mark the bit with tape to ensure vou drill the whole to the correct depth Make sure the hole is drilled to the correct depth to receive the anchor If the hole is too shallow remove the anchor and carefully re drill to the sufficient depth If the hol
14. n England Number 07960087 Registered Office 3rd Floor 17 Hanover Square London W1S 1HU
15. rs Accurate and precise measurements using MEMS sensors e Multiple beams installed in a chain give a complete displacement profile e Measures tilt along the whole length of the beam e Measures vertical rotation e Large measuring range BENEFITS e Fast onsite installation with minimal cable management reduces cable and Datalogger costs Easy to automate using data acquisition system and ARGUS monitoring software Removes the need for manual monitoring e Recoverable and reusable e Suitable for safety critical applications e Fast onsite installation no zero level adjustment required APPLICATIONS e Brick and stone buildings Heave and settlement due to adjacent construction activities e Bridges and dams e Impounding and loading effects in the short or long term e Pipelines e Differential levels e Tunnels e Vertical rotation and track deformation 10 Svstem Description The MEMS Beam Sensor measures rotation of structures in the vertical plane and is mounted horizontallv in beams tvpicallv 1 to 2 5 metres in length When multiple beams are placed end to end a differential displacement profile of the structure from anchor point to anchor point can be derived The diagram below depicts the positive and negative displacement ofthe MEMS Beam Sensor System Components SMART MEMS The Smart MEMS Beam Sensor operates on a single cable system BEAM SENSOR Each Beam connects to the
16. soil INSTRUMENTS Man 246 MEMS BEAM SENSO User Manual Soil Instruments Limited has an ongoing policy of design review and reserves the right to amend these specifications without notice Man246 MEMS Beam Sensor MN1114 Rev1 0 0 What s this manual about This manual tells vou about the MEMS Beam Sensor and how to use it to measure vertical rotations of structures Who does this apply to Installers field engineers and technicians who need to install and acquire readings from MEMS Beam Sensors Welcomel Thank vou for choosing the MEMS Beam Sensor This manual has been written to provide vou with relevant information and to guide vou in the best practice for the use and installation of a MEMS Beam Sensor in order for you to get the most out of our product Please read this manual thoroughly before use to help avoid any problems and keep it handy when installing a MEMS Beam Sensor MEMS Beam Sensor The MEMS Beam Sensor is designed to measure vertical rotations of structures There are two options available for the MEMS Beam Sensor a Standard Beam Sensor which is an independently cabled sensor that connects to a Datalogger or a Smart Beam Sensor which is an inter connecting sensor The Sensors are available in either aluminium or Glass Reinforced Plastic GRP Both sensor types deliver a large measuring range with high sensitivity and relative immunity from the effects of long cable lengths
17. to the Datalogger apply power to the sensors and wait for 3 seconds Take a minimum of 50 readings at differential voltage at a minimum 100 millisecond and then average these readings Power the sensors on and wait for 3 seconds e Take a minimum of 50 readings differential voltage at minimum 100 millisecond intervals e Average the readings Soil Instruments MEMS Beam Sensors are designed to be read by Campbell Datalogger systems Other Dataloggers can be used but the basic reading and excitation architecture outlined in this section must be followed Sensors should be read via a multiplexer Campbell AM416 or AM16 32 and the following sequence must be used to ensure best sensor performance e Activate multiplexer e Switch to first channel a Switch on power supply to sensor Campbell loggers use the switched 12Volt option b Let the sensor warm up for at least 3 seconds c Take a minimum of 50 differential measurements and store the average d Switch power to the sensor off e Switch to the next channel e Repeat step a through e for the next sensor e De activate multiplexer Sensors can be left powered when not being read however for maximum life this is not recommended This is not possible when using multiplexer units therefore the above sequence should be observed When long cable lengths are being used ensure the settling time for the Datalogger measurements are increased to achieve optimal performan
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