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Geokon 6350 Installation Manual Download Page 7

1 

1. INTRODUCTION 

 

1.1 Theory of Operation 

 
The Geokon Model 6350 Vibrating Wire Tiltmeter is designed for permanent long-term 
monitoring of changes in tilt of structures such as dams, embankments, foundation walls and the 
like. The basic principle is the utilization of tilt sensors attached to the structure being studied to 
make accurate measurement of inclination. See Figure 1.  
 
Two brackets are available, one to measure tilt uniaxially, the other biaxially.  
 

 

Figure 1 - Model 6350 Uniaxial Tiltmeter Installation 

 

Wall

 

Tiltmeter

 

Side View

 

Top View

 

Tilt

 

-

 

+

 

Tilt

 

-

 

+

 

Anchor Rod

 

Mounting Bracket

 

Zero Adjust

 

Instrument Cable

 

(4 conductor, 22 AWG)

 

(epoxied in)

 

Summary of Contents for 6350

Page 1: ...ion 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 1995 2018 by Geokon Inc Doc Rev P 06 28 18 Installation Manual Model 6350 Vibrating Wire Tiltmeter ...

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Page 3: ...re 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 t...

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Page 5: ... 405 READOUT BOX 12 3 2 1 Connecting Sensors with 10 pin Bulkhead Connectors Attached 12 3 2 2 Connecting Sensors with Bare Leads 12 3 2 3 Operating the GK 405 12 3 3 GK 403 READOUT BOX OBSOLETE MODEL 13 3 3 1 Connecting Sensors with 10 pin Bulkhead Connectors Attached 13 3 3 2 Connecting Sensors with Bare Leads 13 3 3 3 Operating the GK 403 13 3 4 MICRO 10 DATALOGGER 14 3 4 1 Excitation 14 3 4 2 ...

Page 6: ...AL INSTALLATION 8 FIGURE 8 LIGHTNING PROTECTION SCHEME 10 FIGURE 9 LEMO CONNECTOR TO GK 404 11 FIGURE 10 LIVE READINGS RAW READINGS 12 FIGURE 11 SAMPLE MODEL 6350 CALIBRATION REPORT 18 TABLES TABLE 1 SAMPLE RESISTANCE 17 TABLE 2 RESISTANCE WORKSHEET 17 TABLE 3 MODEL 6350 TILT SENSOR SPECIFICATIONS 19 TABLE 4 THERMISTOR RESISTANCE VERSUS TEMPERATURE 20 EQUATIONS EQUATION 1 DIGITS CALCULATION 15 EQU...

Page 7: ... like The basic principle is the utilization of tilt sensors attached to the structure being studied to make accurate measurement of inclination See Figure 1 Two brackets are available one to measure tilt uniaxially the other biaxially Figure 1 Model 6350 Uniaxial Tiltmeter Installation Wall Tiltmeter Side View Top View Tilt Tilt Anchor Rod Mounting Bracket Zero Adjust Instrument Cable 4 conductor...

Page 8: ...mounting bracket The housing is constructed using stainless steel tubing to minimize the effects of corrosion Biaxial systems use a mounting bracket to mount two transducers at 90 to each other In environments subject to vibrations a damping fluid can be used as shown in the figure below Figure 2 Model 6350 Tilt Sensor To prevent damage during shipment the tilt sensors are locked in place by means...

Page 9: ...he indicated temperature should be close to ambient Note Vibrating wire tilt sensors are shock sensitive and severe shocks can cause a permanent offset or even break the suspension The unit will not survive a two foot 5 m drop onto a hard surface When transporting the tiltmeter tighten the locking clamp screw Checks of electrical continuity can also be made using an ohmmeter Resistance between the...

Page 10: ...or anchor rods 2 2 1 Mounting with a Drop in Anchor 1 Mark the location where the bracket will be installed 2 Using a hammer drill drill a half inch 12 mm hole approximately 1 5 37 mm deep Clean the hole thoroughly blowing out with compressed air if possible 3 Insert the 3 8 drop in anchor with setting pin into the hole The threaded end should be closest to the opening 4 Insert the provided settin...

Page 11: ...allation Biaxial Mounting Bracket Shown 2 2 2 Mounting with an Anchor Rod 1 Mark the location where the bracket will be installed 2 Using a hammer drill drill a half inch 12 mm hole approximately four inches 100 mm deep 3 Clean the hole thoroughly blowing out with compressed air if possible 4 Mix the grout or epoxy and fill the hole 5 Push the 1 2 13 threaded anchor rod into the hole Use a hammer ...

Page 12: ...lustrated in Figure 5 8 Use a bubble level or other leveling device to align the bracket vertically to the wall Figure 5 Anchor Rod Uniaxial Mounting Bracket Shown Top View Flat Washer 4 1 2 13 Anchor Rod Epoxy or Grout Flats to Prevent Bolt Twisting Flat Washers Lock Washer 1 2 13 Nuts Wall ...

Page 13: ...ut until the tiltmeter reads within 50 digits of the zero reading as shown on the calibration report supplied with the sensor See Appendix A for a sample calibration report When the desired reading is reached tighten the cap screws to secure the tiltmeter in place Check the reading again after tightening to make sure it still reads within 50 digits of the zero reading Figure 6 shows the completed ...

Page 14: ...ile observing the readout until the tiltmeter reads within 50 digits of the zero reading as shown on the calibration report supplied with each sensor See Appendix A for a sample calibration report When the desired reading is reached tighten the cap screws to secure the tiltmeter in place Check the reading again after tightening to make sure it still reads within 50 digits of the zero reading Figur...

Page 15: ...lamp screw on the bottom side of the sensor see Figure 2 2 Using the syringe applied first pull the piston from the syringe and squeeze the silicone from the tube into the syringe Replace the piston and start the fluid out of the needle end 3 Inject 2 00 cc of the damping fluid into the hole in the sensor Immediately following this operation the seal screw should be replaced in the sensor 4 The se...

Page 16: ... destroy it Note the following suggestions If the tiltmeter is connected to a terminal box or multiplexer components such as plasma surge arrestors spark gaps may be installed in the terminal box multiplexer to provide a measure of transient protection Terminal boxes and multiplexers available from Geokon provide locations for installation of these components Lighting arrestor boards and enclosure...

Page 17: ...colors of the sensor conductors with blue representing the shield bare To turn the GK 404 on press the ON OFF button on the front panel of the unit The initial startup screen will display After approximately one second the GK 404 will start taking readings and display them based on the settings of the POS and MODE buttons The unit display from left to right is as follows The current Position Set b...

Page 18: ...lace 3 2 2 Connecting Sensors with Bare Leads Attach the GK 403 2 flying leads to the bare leads of a Geokon vibrating wire sensor by connecting each of the clips on the leads to the matching colors of the sensor conductors with blue representing the shield bare 3 2 3 Operating the GK 405 Press the button labeled POWER ON BLUETOOTH A blue light will begin blinking signifying that the Remote Module...

Page 19: ...ng Sensors with Bare Leads Attach the GK 403 2 flying leads to the bare leads of a Geokon vibrating wire sensor by connecting each of the clips on the leads to the matching colors of the sensor conductors with blue representing the shield bare 3 3 3 Operating the GK 403 1 Turn the display selector to position B 2 Turn the unit on 3 The readout will display the vibrating wire output in digits See E...

Page 20: ... and then setting the starting frequency to 200 Hz below and the ending frequency 200 Hz above Alternately the low end frequency sweep setting should be set to 14 1400 Hz the high end 35 3500 Hz 3 5 Measuring Temperatures All vibrating wire piezometers are equipped with a thermistor which gives a varying resistance output as the temperature changes The white and green leads of the instrument cable...

Page 21: ...on the calibration report Calculate θ for R R1 and R R0 then subtract to find the difference θ for R1 R0 4 2 Temperature Correction The Model 6350 Tiltmeter has a very slight temperature sensitivity on the order of 0 5 digit per C rise i e the reading falls by 0 5 digits for every 1 C rise of temperature The temperature correction is K T1 T0 degrees Equation 3 Temperature Correction Where K 0 5G N...

Page 22: ... are Unstable Is the readout box position set correctly If using a datalogger to record readings automatically are the swept frequency excitation settings correct Is there a source of electrical noise nearby Most probable sources of electrical noise are motors generators and antennas Make sure the shield drain wire is connected to ground Does the readout work with another tilt sensor If not the re...

Page 23: ... infinite infinite infinite White infinite infinite N A 3000Ω at 25 C infinite Green infinite infinite 3000Ω at 25 C N A infinite Shield infinite infinite infinite infinite N A Table 1 Sample Resistance Vibrating Wire Sensor Lead Grid SENSOR NAME Red Black White Green Shield Red Black White Green Shield Table 2 Resistance Worksheet ...

Page 24: ...18 APPENDIX A SAMPLE CALIBRATION REPORT Figure 11 Sample Model 6350 Calibration Report ...

Page 25: ...mm Length 7 375 187 mm Weight 1 5 lbs 0 7 kg Materials 304 Stainless Steel Electrical Cable Two twisted pair four conductor 22 AWG Foil shield PVC jacket nominal OD 6 3 mm 0 250 Table 3 Model 6350 Tilt Sensor Specifications Notes Consult the factory for other ranges Depends on readout equipment With averaging techniques it is possible to achieve one arc second Derived using second order polynomial...

Page 26: ...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 17K 32 6576 8 1167 48 292 4 88 94 9 128 56 51K 31 6265 9 1123 49 283 5 89 92 5 129 53 10K 30 5971 10 1081 50 274 9 90 90 2 130 49 91K 29 5692 11 1040 51 266 6 91 87 9 131 46 94K 28 5427 12 1002 52 258 6 92 85...

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