Geokon 6165 Manuel utilisateur

Installation Instructions

Model 6165

MEMS Tilt Beam

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.

(Rev E, 07/17/18)

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.

Geokon 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. INTRODUCTION...................................................................................................................................................1

2. INSTALLATION ....................................................................................................................................................2

2.1 PRELIMINARY TESTS............................................................................................................................................2

2.2 ATTACHING MOUNTING BRACKETS.....................................................................................................................2

2.3 MOUNTING THE BEAM.........................................................................................................................................3

3. TAKING READINGS.............................................................................................................................................5

3.1 INITIAL READINGS...............................................................................................................................................5

3.2 DATALOGGERS ....................................................................................................................................................5

3.3 RB-500 READOUT BOX .......................................................................................................................................5

3.4 MEASURING TEMPERATURE ................................................................................................................................6

4. DATA REDUCTION ..............................................................................................................................................7

4.1 TILT CALCULATION .............................................................................................................................................7

4.2 DISPLACEMENT CALCULATION............................................................................................................................7

4.3 TEMPERATURE CORRECTION...............................................................................................................................8

4.4 ENVIRONMENTAL FACTORS.................................................................................................................................8

5. TROUBLESHOOTING..........................................................................................................................................9

APPENDIX A. SPECIFICATIONS.........................................................................................................................10

A.1 MODEL 6165 MEMS TILT BEAM......................................................................................................................10

A.2 THERMISTOR (SEE APPENDIX BALSO)..............................................................................................................10

APPENDIX B. THERMISTOR TEMPERATURE DERIVATION.....................................................................11

APPENDIX C. SAMPLE CALIBRATION REPORT...........................................................................................12

APPENDIX D. PROGRAMMING THE MEMS TILT BEAM WITH CRBASIC.............................................13

D.1 DESCRIPTION ....................................................................................................................................................13

D.2 SAMPLE PROGRAM............................................................................................................................................13

FIGURES

FIGURE 1-MODEL 6165 MEMS TILT BEAM................................................................................................................. 1

FIGURE 2-BRACKET HARDWARE ................................................................................................................................. 2

FIGURE 3-BRACKETS ATTACHED TO BEAM ................................................................................................................. 3

FIGURE 4-MOUNTING BRACKET ORIENTATION ........................................................................................................... 3

FIGURE 5-MOUNTING HARDWARE............................................................................................................................... 4

FIGURE 6-SAMPLE MODEL 6165 CALIBRATION REPORT.............................................................................................12

TABLES

TABLE 1-03-250V0 CABLE WIRING............................................................................................................................. 5

TABLE 2-MODEL 6165 MEMS TILT BEAM SENSOR SPECIFICATIONS .........................................................................10

TABLE 3-THERMISTOR RESISTANCE VERSUS TEMPERATURE .....................................................................................11

EQUATIONS

EQUATION 1-INCLINATION........................................................................................................................................... 7

EQUATION 2-CALCULATED TILT.................................................................................................................................. 7

EQUATION 3-CALCULATED DISPLACEMENT ................................................................................................................ 7

EQUATION 4-TEMPERATURE CORRECTION -TILT ........................................................................................................ 8

EQUATION 5-TEMPERATURE CORRECTION -DISPLACEMENT....................................................................................... 8

EQUATION 6-RESISTANCE TO TEMPERATURE .............................................................................................................11

1. INTRODUCTION

Geokon’s Model 6165 MEMS Tilt Beams are designed to be attached to structures, either

vertically or horizontally, to measure any tilting or differential settlements that may occur. The

tilt beams can be coupled together, in long horizontal strings, to measure differential settlement

along embankments, railroad tracks, pipelines, tunnels, etc. They can also be used in vertical

strings to measure the horizontal deformation of retaining walls, sheet piling, etc.

Each tilt beam contains a Micro-Electro-Mechanical-System (MEMS) sensor, which offers high

sensitivity and accuracy over a range of ±15 degrees. MEMS tilt sensors have very good long-

term stability, are virtually immune to shock loading, and have very low thermal coefficients.

They are readily adaptable to automation and remote monitoring for profiling in real-time. The

included signal conditioning yields a sensor output of ±3 volts at ±10 degrees and is designed to

drive long cables without output signal degradation.

The MEMS sensor is mounted inside a fiberglass, aluminum, or anodized aluminum channel

equipped with lugs for mounting to the structure under study. The beams are bolted to the

structure using the supplied hardware, which includes two 3/8" expansion anchors. A thermistor

mounted inside the sensor housing permits the measurement of temperatures. Readout of the tilt

beams is accomplished by using a Geokon Model RB-500 Readout, or 8600 Series Datalogger.

Figure 1 - Model 6165 MEMS Tilt Beam

2. INSTALLATION

2.1 Preliminary Tests

Prior to installation, each tilt beam should be checked for proper operation by completing the

following:

1) Connect the beam to a readout or datalogger. (See Section 3 for readout and datalogger

instructions.)

2) Depending upon which version of the tilt beam was purchased, hold the beam in a strictly

horizontal or vertical position. The beam must be held in a steady position while taking

readings. The observed reading should be close to the factory zero reading provided on the

calibration report. (Note that the RB-500 Readout Box uses a 2:1 voltage divider to halve

the full-scale output of the MEMS sensor, which is ±4 volts. This is done so that the ±2

volt DVM in the RB-500 readout box can display the full output range of the MEMS

sensor.)

3) At one end of the beam there is a label that shows the sign of the change in readout voltage

when that end of the beam is tilted in the direction shown. Tilts in a positive direction (+)

should yield increasing readings. Tilts in a negative direction (-) should yield decreasing

readings. The temperature indicated on the readout should be close to ambient.

4) Repeat this process with the remaining beams.

Should any of these preliminary tests fail, see Section 5 for troubleshooting.

2.2 Attaching Mounting Brackets

Each beam is supplied with mounting brackets and associated hardware (Figure 2). To mount the

brackets to the beam: Slide the external tooth lock washers (D) onto the bolts (C), followed by

the flat washers (E). Use the bolts to attach the mounting brackets to the ends of the beam. Figure

3 shows the completed assembly.

Figure 2 - Bracket Hardware

Figure 3 - Brackets Attached to Beam

Make sure the mounting brackets are orientated so that when the beam is mounted, the front of

the beam will be facing out, as shown in Figure 4.

Figure 4 - Mounting Bracket Orientation

2.3 Mounting the Beam

1) Place the beam in the desired location.

2) Use a spirit level to make sure the beam is as close to a truly vertical or horizontal position as

possible, depending upon the type of beam purchased.

3) Using the beam as a template, mark the locations of the holes in the mounting brackets on the

mounting surface. The marks should be as close as possible to being in line on a horizontal or

vertical plane.

4) Using a masonry drill (or other suitable equipment), drill two 12 mm (1/2") diameter holes,

approximately 40 mm (1.6") deep at the marked locations.

5) Clean the holes thoroughly. (Blow them out with compressed air if possible.)

6) Insert the expansion anchors into the holes, with the slotted end down.

7) Insert the provided setting tool, small end first, into the anchor. Expand the anchor by hitting

the large end of the setting tool with several sharp hammer blows.

8) Thread the supplied 3/8-16 anchor rod into the anchor. Thread-locking cement can be used to

ensure the hardware remains secure.

9) Attach the beam to the mounting surface by arranging the mounting hardware as shown in

Figure 5. Use thread locking cement if desired.

Figure 5 - Mounting Hardware

10)The beam must be level along the axis of the beam, as well as the perpendicular axis. This is

to avoid any off-axis errors which can occur if the MEMS sensor is rotated axially too far

away from a true horizontal or vertical position. The spherical washers allow the beam to be

rotated in respect to the anchor bolt, thus adjustments can be made to avoid this type of error.

For vertical tilt beams, the axis of tilt can be either in the plane of the wall or perpendicular to

the wall. The direction is selectable by slackening the bolts holding the mounting brackets to

the ends of the beam and turning it 90 degrees.

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