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Geokon 6160 Installation Manual

Mems tilt sensor
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Installation Manual
Model 6160/6161
MEMS Tilt Sensor
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 © 2006, 2008, 2009, 2010, 2011, 2015 by Geokon, Inc.
(REV O 7/15)

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Summary of Contents for Geokon 6160

  • Page 1 Model 6160/6161 MEMS Tilt Sensor 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.
  • Page 3 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.

  • Page 5: Table Of Contents

    2 INSTALLATION ..............................2 2.1. Preliminary Tests ............................2 2.2. Installation Instructions..........................3 2.2.1 Model 6160 Uniaxial and Biaxial Installation Instructions ................ 3 2.2.2 Model 6161 Uniaxial and Biaxial Installation Instructions ................ 5 ........5 SE THE TILTMETER TO MARK THE WALL WHERE THE DROP IN ANCHORS WILL BE INSTALLED 2.3.
  • Page 6 LIST of FIGURES, TABLES and EQUATIONS 1A – M 6160 MEMS T ......................1 IGURE ODEL ENSOR 1B – M 6160 T ..............1 IGURE OUNTING RACKET FOR THE ODEL ENSOR 2 - M 6161 T ......................... 2 IGURE ODEL...

  • Page 7: Introduction

    There are two main types of Tilt Sensors: The Model 6160 is an adaption of the tiltmeter used in Model 6150 In-Place Inclinometer, and the 6161 utilizes the same MEMS sensors inside a Nema 4 enclosure.

  • Page 8: Installation

    Figure 2 - Model 6161 Tilt Sensor 2 INSTALLATION 2.1. Preliminary Tests Prior to installation, the sensors need to be checked for proper operation. Each tilt sensor is supplied with a calibration sheet, which shows the relationship between output voltage and inclination.

  • Page 9: Installation Instructions

    2.2. Installation Instructions 2.2.1 Model 6160 Uniaxial and Biaxial Installation Instructions 1. The first step is to install the uniaxial/biaxial mounting bracket (see Figure 4), which is designed for mounting on vertical walls. Figure 3 - Tiltmeter Mounting Bracket Mark the location on the wall and drill, using a hammer drill, a 9.5mm (3/8") hole approximately 37 mm (1½") deep.
  • Page 10 Wall Flat Washers Flat Washer 1/4 - 20 Nuts Lock Washer 2" long 1/4 - 20 Anchor Rod Setting Pin Tilt B 10-32 Nuts 1/4" Drop - In Anchor 10-32 Cap Screws Mounting Tilt A Bracket View Figure 4 – Uniaxial or Biaxial Tiltmeter Installation Details 2.

  • Page 11: Model 6161 Uniaxial And Biaxial Installation Instructions

    2.4. Lightning Protection The Model 6160 MEMS Tiltmeter, unlike numerous other types of instrumentation available from Geokon, does not have any integral lightning protection components, i.e. transzorbs or plasma surge arrestors. Usually this is not a problem. However, if the instrument cable is exposed, it may be advisable to install lightning protection components, as the transient could travel down the cable to the gage and possibly destroy it.

  • Page 12: Taking Readings

    3. TAKING READINGS 3.1 Dataloggers In most cases the 6160 and 6161MEMS Tiltmeters will be monitored continuously and automatically using a Datalogger. Connections to the Geokon Model 8021 Micro-1000 Datalogger, which uses a Campbell Scientific CR1000 MCU are shown in Appendix C Page 12.

  • Page 13: Data Reduction

     =zero, and G is the Gage Factor Where R is the current reading in volts, R zero shown on the calibration sheet for the Model 6160 tiltmeter. Note that for measurements of tilt, i.e changes of inclination, where R is the initial reading and R...

  • Page 14: Environmental Factors

    5. TROUBLESHOOTING Maintenance and troubleshooting of the MEMS sensors used in the Model 6160 and 6161 Tiltmeters are confined to periodic checks of cable connections. The sensors are sealed and there are no user-serviceable parts.
  • Page 15 Figure 6 - Sample Model 6160 or 6150 Calibration Sheet...

  • Page 16: Appendix A - Specifications

    6 twisted pair (12 conductor) 24 AWG Foil shield, Polyurethane jacket, nominal OD = 7.9 mm Table A-1 Model 6160 and 6161 Tilt Sensor Specifications Notes: Depends on readout equipment. For best results requires a 4 ½ digit digital voltmeter.

  • Page 17: Appendix B - Thermistor Temperature Derivation

    APPENDIX B - THERMISTOR TEMPERATURE DERIVATION Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3 Resistance to Temperature Equation:   2732   A B LnR C LnR Equation B-1 Convert Thermistor Resistance to Temperature T  Temperature in C. Where;...

  • Page 18: Appendix C Wiring Code

    Table B-1 Thermistor Resistance versus Temperature APPENDIX C WIRING CODE Connector Pin Uniaxial MEMS with Connector Pin Biaxial MEMS 03-250V0 Designation Thermistor Designation without Thermistor cable 12VDC 12VDC Red’s Black Ground Ground White A Out Diff + A Out Diff + White’s Black A Out Diff - A Out Diff -...

  • Page 19: Appendix D 6160 Standard Addressable Systems

    APPENDIX D 6160 Standard Addressable Systems Description: The standard 6160 addressable system incorporates a Distributed Multiplexer Circuit Board that allows multiple MEMS type tiltmeters, uniaxial or biaxial, to be connected as “drops” off of a single bus. The tiltmeter “string” is addressed via ENABLE and CLOCK signals in the same manner as the Geokon Model 8032-16 Channel Multiplexer.

  • Page 20: Specifications For Addressable System (Logic Level Style) Circuit Board

    Bare Shield Table D-1 Addressable MEMS (Logic Level Style) Wiring *1K and 5K precision resistors are used to complete the thermistor bridge circuit: Figure D-1 Thermistor Bridge Circuit Specifications for Addressable System (Logic Level Style) Circuit Board: 4.5”(L) x 1.155”(W) x 0.4”(H) Board Dimensions: Power Requirements: +12V (+/- 3V)

  • Page 21: Appendix E Crbasic Programming

    APPENDIX E CRBASIC PROGRAMMING Programming the MEMS Tiltmeter with CRBASIC Description: CRBASIC is the programming Language used with Campbell Scientific CRBASIC Dataloggers. Campbell’s Loggernet Software is typically used when programming in CRBASIC. The MEMS sensor should be read with the VoltDiff instruction and the output averaged 100x. No Thermistor in this example.

  • Page 22: Programming The Addressable Mems Tiltmeter With Crbasic

    Programming the Addressable MEMS Tiltmeter with CRBASIC Description: CRBASIC is the programming Language used with Campbell Scientific CRBASIC Dataloggers. Campbell’s Loggernet Software is typically used when programming in CRBASIC. The MEMS sensor should be read with the VoltDiff instruction and the output averaged 100x. Sample Program: ‘The following sample program reads 20 addressable Bi-Axial MEMS Gages and Thermistors.
  • Page 23 'counter for number of sensors For Channel = 1 To 20 '1st clock using C8 PortSet(8,1) Delay(0,10,MSEC) PortSet(8,0) Delay(0,10,MSEC) 'Delay Delay(0,100,mSec) 'Read the A-axis 'Reset the temporary storage location MEMS_3 = 0 'counter For MEMS_1 = 1 To 100 'differential voltage measurement on DIFF1 VoltDiff (MEMS_2,1,mV5000,1,False,0,1000,0.001,0) 'Sum the readings MEMS_3 = MEMS_3 + MEMS_2...
  • Page 24 'Calculate the Average reading value Reading_B = MEMS_3 / 100 'Delay Delay(0,100,msec) 'Read the thermistor 'half bridge measurement - SE5 AND EX1 BrHalf(THERM_1,1,mV2500,5,VX1,1,2500,0,1000,250,2.5,0.0) 'Calculate the temperature THERM_2 = THERM_1 / 5000 THERM_3 = (2.5 - (THERM_2*1000) - THERM_1)/THERM_2 Reading_THERM = 1/(.0014051 + (.0002369*LOG(THERM_3)) + (.0000001019*(LOG(THERM_3)^3))) - 273.2 '2nd clock using C8 PortSet(8,1)

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