6101D MEMS Digital Tiltmeter
Contents
1. The World Leader Vibrating Wire Technology 48 Spencer Street Lebanon NH 03766 USA Tel 603 448 1562 Fax 603 448 3216 E mail geokon geokon com http www geokon com Instruction Manual Model 6101D MEMS Portable Tiltmeter No part of this instruction manual may be reproduced by any means without the written consent of Geokon Inc The information contained herein is believed to be accurate and reliable However Geokon Inc assumes no responsibility for errors omissions or misinterpretation The information herein is subject to change without notification Copyright O 2015 by Geokon Inc Doc REV C 9 15 Warranty Statement Geokon Inc warrants its products to be free of defects in materials and workmanship under normal use and service for a period of 13 months from date of purchase If the unit should malfunction it must be returned to the factory for evaluation freight prepaid Upon examination by Geokon if the unit is found to be defective it will be repaired or replaced at no charge However the WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of being damaged as a result of excessive corrosion or current heat moisture or vibration improper specification misapplication misuse or other operating conditions outside of Geokon s control Components which wear or which are damaged by misuse are not warranted This includes fuses and batteries Geokon2. 7 Fig re 7 Saving dala Query 2 t eiae doa td 8 Figure 8 Sav File Dialog x EH I REND M Hide p EIE 8 Figure 9 s PIOEXISIS cii e pM ete Ede Me paene ele tu E 9 Figure 10 A Typical Tiltmeter Calibration 12 1 Introduction The Geokon Model 6101D MEMS Portable Tiltmeter is a precise portable instrument designed to make rapid determinations of tilting in the monitoring of structures and soil and rock masses has applications in landslide monitoring movements adjacent to excavations tilting in buildings retaining walls bridge abutments dams etc Figure 1 Model 6101D MEMS Portable Tiltmeter When connected by Bluetooth wireless the Model 6101 Tiltmeter see Figure 1 can be read with the Model FPC 1 Handheld Field PC see Figure 2 The lack of an interconnecting cable greatly facilitates the readout procedure 2 Description The MEMS tiltmeter system usually consists of three main components They are the tiltmeter the Handheld Field PC and the tilt plates Tilt plates examples are shown in figure 3 are designed to be permanently attached to the structure either by epoxy bonding ceramic plates or by bolting stainless steel plates copper coated aluminum plates The sensing elements in the tiltmeter are two MEMS sensor oriented at 90 degrees and sealed in a waterproof housing Axis A is aligned with the body of the
3. Reading Peg 2 to 4 B 0 0469 Degrees Reading Peg 4 to 2 B 0 0342 Degrees Peg 1 and 3 Tilt in the A axis direction is given by the difference A A 0 0447 0 0581 0 1028 Degrees Peg 2 and 4 Tilt in the B axis direction is given by the difference B B 0 0469 40 0342 0 0811 Degrees Note that the tilt is towards Peg 1 positive and towards Peg 4 negative A positive figure for both A and B axes means that the tilt is towards Pin 1 and towards Pin 2 11 These two tilts can be combined to give the maximum resultant tilt and its direction This is done by first calculating the deflections in the A axis and the B axis using the relationships 1 arc second 0 0048mm m or 1 arc second 0 00062 inches ft In the above example Deflection in the A axis direction DA 0 1028 x 3600 x 0 0048 1 78mm m Deflection in the B axis direction DB 0 0811 x 3600 x 0 0048 1 4 mm m The maximum deflection Dmax is given by the equation Dmax Y 1 78 2 1 4 2 2 26 mm m And the angle the angle between the direction of Peg 1 and the direction of the maximum tilt is given by the formula Tan DB DA Tan 1 4 1 78 And the direction of the maximum defection is 38 degrees from the direction of Peg 1 in the direction of Peg 4 For further information refer to the GK604D manual 12 5 3 Calibration The calibration sheet shown in figure 10 sh
4. Bluetooth pairings The recommended steps for connecting to and taking a reading with the Model 6101D Tiltmeter are as follows 1 Create an initial hole configuration corresponding to the unique location of the tilt plate where tilt is to be measured e Using the Context Menu see section 3 2 1 of the GK 604D Manual after highlighting the Project element select the Add Hole menu item to create a new configuration e Since the hole corresponds to a physical location be sure to name it appropriately such as Location 1 e Additional information may be entered in the Description field e For the first location hole created select UNKNOWN for Probe name e The hole parameters such as Starting Level Interval Top Elevation and Azimuth Angle are not applicable for Tiltmeter operation and can be left blank e Tap Save Settings to save the new location hole configuration See section 4 10f the GK4 604D manual for more information about hole configuration Make sure that the hole corresponding to the location to be measured is selected in the Project Explorer Press the ON OFF button on the 6101D Tiltmeter and ensure that the blue indicator is blinking Tap the Live Readings menu item from the Application menu to start the reading process If a valid Bluetooth connection can be established a dual axis tiltmeter specific Live Readings screen will be displayed see Figure 6
5. Note the drop down control in Figure 6 located just to the right of the A value display This allows the A and values to be displayed in 3 different units described below Digits Digit values are read directly from the 6101D Tiltmeter and are internally calculated as follows R1 internal MEMS module voltage volts RO Zero Shift A from internal probe configuration GF Gage Factor A from internal probe configuration GO Gage Offset A from internal probe configuration usually zero DIGITS R1 RO GF GO 2500 Volts PV DIGITS 2500 for Geokon probes 4V 30 degrees Degrees DEGREES arcsin DIGITS 20000 180 Pi From this Menu select Degrees Live Tiltmeter Data Level feet v 0 031 Z7 0 002 1 Dataset 1 History Al A2 B1 B2 1 2 Hole TiltTest o Probe tiltMeter Record Data Status Connected Record Data Figure 6 Live Readings Tiltmeter Align the Tiltmeter on the tiltplate in the A orientation then tap Record Data to take the reading For the Model 6101D the B reading is taken at the same time as Tap the Dataset icon and observe that the dataset number changes to 2 7 Live Tiltmeter Data Level Unsaved data 2 Save tiltmeter data 0 B2 Bl 1 2 1 2 Hole TiltTest rN s FA Prone tiltMeter Record Data Status Disconnect Record Data Figure 7 Saving data qu
6. be stored in a single data file See section G 4 for an example of Dual Axis Tiltmeter data format 11 Tapping No at the File exists dialog will again call up the Save File dialog see Figure 8 and another opportunity will be given to select a new file 4 2 Dual Axis Tiltmeter Data Format KKK GK 604E v1 3 0 0 02 15 2 0 FORMAT II PROJECT Site 1 LOCATION Loc1 DATE 02 19 15 TIME 14 54 17 PROBE NO tiltMeter UNITS DEGREES FILE NAME Loc1 Tiltmeter gkn A A B B Date Time 0 031 40 028 40 002 0 002 2 19 15 14 50 25 0 033 40 030 40 002 0 002 2 17 15 13 54 40 0 037 40 036 0 002 0 002 2 14 15 13 45 20 0 038 40 035 0 002 0 002 2 10 15 11 23 30 10 5 Data Recording and Reduction 5 1 The change in tilt and deflection Can be calculated by comparing the values of the A and A and the B and B readings on subsequent days i e Change of Tilt the A axis A 2 and Change of Tilt in the B axis A B B 2 on subsequent days The change of tilt can be converted into a deflection using the conversion factor 1 arc second z 0 0048mm meter or 1 arc second z 0 000058inches ft 5 2 Example of readings taken from a horizontal tiltplate Four readings are taken two each for Pin 1 and 3 and two each from Pins 2 and 4 following the instructions of Section 4 Reading Peg 1 to 3 A 0 0447 Degrees Reading Peg 3 to 1 A 0 0581 Degrees
7. 11800 can be used The epoxy should be allowed to fully cure before readings commence The tilt plate that is being observed should have an 1 0 number written on it Tiltplates are numbered 1 to 4 in a clockwise direction It is recommended that Pin 1 be oriented towards the direction of the greatest expected tilting Note If using ceramic tiltmeter plates care should be taken to avoid nicking or cracking the ceramic surface of the tiltplate pegs The ceramic material is very brittle 3 1 Vertical installations For vertical installations such as building walls bridge abutments etc the tilt plate pegs must be aligned as close to vertical as possible with Peg 41 at the top See Figure 4 Plus End Up Minus End Up Figure 4 Measurements in the Vertical Plane When taking readings in the vertical plane first hold the end of the tiltmeter against the tiltplate so that the long bar lies to the left of pegs 1 and 3 and the short bar lies on top of peg 2 see Figure 4 Now take the first set of readings A axis and B axis Turn the tiltmeter end for end and position the long bar to the right of pins 1 and 3 with the short bar resting on top of peg 4 Now take the second set of readings The second set of reading is the reverse 180 of the first set of readings Taking the difference of the two sets of readings and dividing by two yields a number that eliminates any zero offset in the two MEMS sensors 5 3 2 Horizontal ins
8. ery 7 Save File Enter a file name to save data to A file extension of gkn will automatically be appended to this filename If no folder is specified the file will be saved in the default data folder for the selected hole Tap the Browse button if another folder is desired File Name Location 1 Folder Name Application Data Geokon GK 6 Cancel Save Figure 8 Save File Dialog 8 Reverse the Tiltmeter orientation to A and again tap Record Data to take the A reading For the Model 6101D the B reading is taken at the same time as A Tapping Menu Exit Live Readings will display the window in Figure 7 Tap the Yes button to start the data saving process The Save File dialog Figure 8 will be displayed allowing the user to name the data file to save 9 After tapping Save the GK 604 IRA will determine if the exists If this is a new file then the data will be written to it in a format similar to the standard Inclinometer format If a file of the same name already exists then the dialog shown in Figure 9 will be displayed Live Tiltmeter Data Level File exists File Loci_Tiltmeter gkn Ney already exists Append data this file 1 2 0 1 2 Hole Loci dm Probe tiltMeter C Record Data Status Disconnecti Record Data Figure 9 File Exists Dialog 10 Tapping Yes on the File exists dialog allows multiple reads for this location to
9. he circuitry and are to be avoided 4 The outputis digital
10. manufactures scientific instruments whose misuse is potentially dangerous The instruments are intended to be installed and used only by qualified personnel There are no warranties except as stated herein There are no other warranties expressed or implied including but not limited to the implied warranties of merchantability and of fitness for a particular purpose Geokon Inc is not responsible for any damages or losses caused to other equipment whether direct indirect incidental special or consequential which the purchaser may experience as a result of the installation or use of the product The buyer s sole remedy for any breach of this agreement by Geokon Inc or any breach of any warranty by Geokon Inc shall not exceed the purchase price paid by the purchaser to Geokon Inc for the unit or units or equipment directly affected by such breach Under no circumstances will Geokon reimburse the claimant for loss incurred in removing and or reinstalling equipment Every precaution for accuracy has been taken in the preparation of manuals and or software however Geokon Inc neither assumes responsibility for any omissions or errors that may appear nor assumes liability for any damages or losses that result from the use of the products in accordance with the information contained in the manual or software TABLE of CONTENTS 1 INTRODUCTID ON 1er etes etit tai Recte eb co estia es DNUS UH inas caen ee a Diva Pa aee tene Spi
11. ows the calibration factor G which is entered into the tiltmeter at the factory so that the tiltmeter output can be shown directly in degrees Geoko 48 Spencer St Lebanon 03766 USA 6101D MEMS Portable Tiltmeter Calibration Data Serial Number 1530490 Calibration Date September 21 2015 Temperature 22 7 C Calibration Instruction ClI Tiltmeter MEMS MDP ablavamce Technician Reading Reading Inclination A Axis B Axis degrees Volts Volts 15 4 108 4 113 10 2 743 2 799 9 2 467 2 524 8 2 191 2 250 7 1 914 1 974 6 1 636 1 697 5 1 358 1 419 4 1 079 1 142 3 0 802 0 865 2 0 522 0 588 1 0 243 0 309 0 0 036 0 031 1 0 315 0 248 2 0 594 0 526 3 0 873 0 804 4 1 152 1 082 5 1 430 1 361 6 1 708 1 639 7 1 987 1 916 8 2 264 2 193 9 2 539 2 470 10 2 816 2 750 4 181 4 113 6101D Tilt A Axis Gage Factor Gu 3 602 degrees Volt over 30 range 6101D Tilt B Axis Gage Factor 3 618 degrees Volt over 30 range Calculated Tilt Gj R Ro degrees Temperature Correction Factor 0 0003 T T Volts C See manual for further information Wiring Code The above instrument was found to be in tolerance in all operating ranges The above named instrument has been calibrated by comparison with standards traceable to the NIST in compliance with ANSI Z540 1 This report shall not be
12. p Poil e Oodd 1 2 DESCRIPTION Iber nS 1 INSTALLATION AND USE OF THE TILTPLATES neto aetas staat ease ease tosta sno 3 3 1 VERTICAL INSTAELATIONS reote Ee eee UE Eire cete Hee ee ERR 4 3 2 HORIZONTAL INSTALLATION Si irei onnen I eene eene innere tenete nete E tenete TSE enen ene NT ennt nennen trennen tren 3 4 TAKING READINGS peter M 5 4 1 DUAL CHANNEL DIGITAL TILTMETER 61010 nennen ener enne nre 5 4 2 DUAL AXIS TILTMETER DATA FORMAT enne en nete tene tene teet tren tren reete eterne enne inet enne 9 5 DATA RECORDING AND REDUCTION 10 5 2 EXAMPLE OF READINGS TAKEN FROM A HORIZONTAL TILTPLATE 10 6 TROUBLESHOOTING or 13 7 SPECIFICATIONS MODEL 6101 MEMS PORTABLE TILTMETER 13 TABLE of FIGURES Figure 1 Model 6101D MEMS Portable 1 Figure 2 Model Handheld Field PC rae RIP teats 2 Figure Tiltplates 6201 1C ceramic 6201 1A Copper plated Aluminum 3 Figure 4 Measurements in the Vertical 4 Figure 5 Measurements in the Horizontal Plane esses esee enne 5 Figure 6 Live Readings Tiltmeter
13. reproduced except in full without written permission of Geokon Inc Figure 10 A Typical Tiltmeter Calibration Sheet 13 6 Troubleshooting The main concerns of tiltmeter surveys are the measurement of change in magnitude and direction of rotati movement The zero offset of the sensor is not ci cal because the algebraic difference of the two readings eliminates the effect A tiltplate tilted at an angle and located on a stable surface can be read periodically to check the calibration of the instrument The sensor itself should not be opened in the field and if the unit fails to work it should be returned to Geokon for repair 7 Specifications Model 6101 MEMS Portable Tiltmeter Range 15 Output at 15 tilt 4 Volts DC Nominal Input Supply Voltage 9 1018 Volts DC Input Supply Current 25 mA Resolution 4 arc seconds 0 02mm m Accuracy 10 arc seconds 0 05mm m Thermal zero shift 0 0003volts C rise Temperature Range Operating 0 to 50 C Temperature Range Storage 20 to 80 C Shock Survival 2000g Dimensions Sensor 172x 102 x 166mm Weight 6 5Kg including case Connector Bluetooth 9 Notes Depends on readout equipment For best results requires a 4 1 2 digit digital voltmeter Averaging will yield resolution on the order of 2 arc seconds Based upon the use of a second order polynomial 3 Voltages in excess of 18V will damage t
14. tallations For Horizontal installations point the Peg 1 in the same direction as the expected tilt See Figure 5 Over Peg 1 Over Peg 3 First Second at 180 degrees Figure 5 Measurements in the Horizontal Plane When taking readings in the horizontal plane first hold the end of the tiltmeter over peg 1 so that the long bar on the underside of the tiltmeter lies to the left of pegs 1 and 3 and the short bar lies against peg 2 as shown in figure 4 Now take the first set of readings Turn the tiltmeter end for end so that the end of the tiltmeter is over peg 3 and position the long bar to the right of pins 1 and 3 with the short bar resting against peg 4 as shown in figure 4 Now take the second set of readings The second set of readings is the reverse 180 of the first 4 Taking Readings More information regarding the method of reading is given in the GK 604D User s Manual supplied with the portable tiltmeter They are duplicated here for completeness 4 1 Dual Channel Digital Tiltmeter Model 6101D The Model 6101D Tiltmeter contains an integral battery and Bluetooth module allowing the tiltmeter to be read directly with the FPC 1 running the GK 604D IRA No external Interface Module is needed The Model 6101D measures tilt in 2 axes A and B 6 It is assumed that a valid Bluetooth pairing exists between the 6101D and the FPC 1 see section 2 2 of the GK 604 D User s Manual for more information about establishing
15. tiltmeter and tilting in the direction of the end marked produces a positive change in the readings of the A axis At the same time a reading on the B axis will be taken and the positive direction of the B axis is at 90 degrees clockwise looking down on the tiltmeter The output of the Geokon Model 6101D MEMS tiltmeter is equal to approximately 4 volts at 15 The sensor is aligned on the tiltplate using alignment bars so that the same position and orientation is guaranteed for every reading Readout is accomplished using the Model FPC 1 Handheld Field PC 000 NAUTIZKT powered by Getac 72 GK 604D IRA Geokon Project Explorer 3 Probe Library myProbeLib2 Workspace myWork Project myistProj B Project proj2 HL Hole2 Probe testProbe Hole Hole1 Status Disconnected amp Application Figure 2 Model FPC 1 Handheld Field PC 3 Installation and Use of the Tiltplates Figure 3 Tiltplates 6201 1C ceramic 6201 1A Copper plated Aluminum 6201 15 stainless Portable tiltmeters must be manually read so the location of the tiltmeter plate must be both protected and accessible Covers are available for installations in areas where heavy construction is ongoing or where vandalism may be a problem The tiltplates should be installed on firm clean surfaces as close to flat as is possible Most installations utilize epoxy as the body bonding medium A resin such as Devcon VW
Download Pdf Manuals
Related Search