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Geokon 4400, Instruction Manual

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Geokon 4400 Instruction Manual Download Page 6

LIST of FIGURES, TABLES and EQUATIONS 

 

 

  

 

 

F

IGURE 

1

 

-

 

M

ODEL 

4400

 

V

IBRATING 

W

IRE 

E

MBEDMENT 

J

OINTMETER

 .................................................................. 1

 

F

IGURE 

2

 

-

 

S

OCKET 

I

NSTALLATION

 .........................................................................................................................  2

 

F

IGURE 

3

 

S

HOWING 

P

IN 

E

NGAGED IN 

S

LOT

 ............................................................................................................  3

 

F

IGURE 

4

 

–

 

C

OMPLETED 

E

MBEDMENT 

J

OINTMETER 

I

NSTALLATION

 ....................................................................... 4

 

E

QUATION 

1

 

-

 

D

IGITS 

C

ALCULATION

 ......................................................................................................................  8

 

E

QUATION 

2

 

-

 

D

EFORMATION 

C

ALCULATION

 .........................................................................................................  8

 

T

ABLE 

1

 

-

 

E

NGINEERING 

U

NITS 

C

ONVERSION 

M

ULTIPLIERS

 .................................................................................. 8

 

E

QUATION 

3

 

-

 

T

HERMALLY 

C

ORRECTED 

D

EFORMATION 

C

ALCULATION

 ................................................................  9

 

E

QUATION 

4

 

-

 

T

HERMAL 

C

OEFFICIENT 

C

ALCULATION

 ........................................................................................... 9

 

T

ABLE 

2

 

-

 

T

HERMAL 

C

OEFFICIENT 

C

ALCULATION 

C

ONSTANTS

 ............................................................................. 9

 

E

QUATION 

5

 

-

 

G

AGE 

L

ENGTH 

C

ORRECTION

 ............................................................................................................  9

 

T

ABLE 

A-1

 

E

MBEDMENT 

J

OINTMETER 

S

PECIFICATIONS

 .......................................................................................  12

 

E

QUATION 

B-1

  

C

ONVERT 

T

HERMISTOR 

R

ESISTANCE TO 

T

EMPERATURE

 .............................................................  13

 

T

ABLE 

B-1

  

T

HERMISTOR 

R

ESISTANCE VERSUS 

T

EMPERATURE

 ........................................................................... 13

 

 
 
 
 
 

Summary of Contents for 4400

Page 1: ...s 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 1985 2016 by Geokon Inc Doc Rev J 11 10 16 ...

Page 2: ......

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...

Page 4: ......

Page 5: ...L NOISE 5 2 5 INITIAL READINGS 5 3 TAKING READINGS 6 3 1 OPERATION OF THE GK 403 READOUT BOX 6 3 2 OPERATION OF THE GK 404 READOUT BOX 6 3 3 MEASURING TEMPERATURES 7 4 DATA REDUCTION 8 4 1 DEFORMATION CALCULATION 8 4 2 TEMPERATURE CORRECTION 9 4 3 ENVIRONMENTAL FACTORS 10 5 TROUBLESHOOTING 11 APPENDIX A SPECIFICATIONS 12 A 1 MODEL 4400 EMBEDMENT JOINTMETER 12 A 2 THERMISTOR SEE APPENDIX B ALSO 12 ...

Page 6: ...ION 8 EQUATION 2 DEFORMATION CALCULATION 8 TABLE 1 ENGINEERING UNITS CONVERSION MULTIPLIERS 8 EQUATION 3 THERMALLY CORRECTED DEFORMATION CALCULATION 9 EQUATION 4 THERMAL COEFFICIENT CALCULATION 9 TABLE 2 THERMAL COEFFICIENT CALCULATION CONSTANTS 9 EQUATION 5 GAGE LENGTH CORRECTION 9 TABLE A 1 EMBEDMENT JOINTMETER SPECIFICATIONS 12 EQUATION B 1 CONVERT THERMISTOR RESISTANCE TO TEMPERATURE 13 TABLE ...

Page 7: ...nsducer Housing Tripolar Surge Arrestor Seal Screw Coil Assembly Instrument Cable 16 093 Gage Connector Universal Joint Universal Joint Gage End Flange Connector Alignment Pin Swagelok Fitting Transducer Wires 2 places Protective PVC Gage Housing 408 8mm Figure 1 Model 4400 Vibrating Wire Embedment Jointmeter In use a socket is placed in the first lift of concrete and when the forms are removed a ...

Page 8: ...hould be approximately 3000 ohms at 25 see Table B 1 and between any conductor and the shield should exceed 2 megohms 2 2 Embedment Jointmeter Installation The installation of the Vibrating Wire Embedment Jointmeter consists of two stages first installing the socket and second installing the gage 2 2 1 Installing the Socket The socket of the gage is meant to be installed in the first lift of concr...

Page 9: ...howing Pin Engaged in Slot 3 Remove the seal screw from the cable end flange See Figure 1 This allows air to enter the inside of the jointmeter while it is being adjusted 4 Push the gage into the socket until it stops While applying an inward pressure rotate the gage in a clockwise direction for approximately 4 revolutions until the connection is snug in the socket thread Note If the stiff direct ...

Page 10: ...ocket to hold the gage at this reading while the concrete is being placed If the gage has to be removed from the socket it MUST be pushed back in until the pins catch and then rotated counter clockwise until it comes loose 2 2 3 2 Model 4400 12 The above procedure for the longer range models is not recommended for the 4400 12 model Here the danger of over ranging the sensor due to the sudden relea...

Page 11: ... interference such as power lines generators motors transformers arc welders etc Cables should never be buried or run with AC power lines The instrument cables will pick up the 50 or 60 Hz or other frequency noise from the power cable and this will likely cause a problem obtaining a stable reading Contact the factory concerning filtering options available for use with the Geokon dataloggers and re...

Page 12: ...on of the GK 404 Readout Box The GK404 is a palm sized readout box which displays the Vibrating wire value and the temperature in degrees centigrade The GK 404 Vibrating Wire Readout arrives with a patch cord for connecting to the vibrating wire gages One end will consist of a 5 pin plug for connecting to the respective socket on the bottom of the GK 404 enclosure The other end will consist of 5 l...

Page 13: ...rature are so large the effect of cable resistance is usually insignificant 2 Look up the temperature for the measured resistance in Table B 1 Appendix B Alternately the temperature could be calculated using Equation B 1 Appendix B For example a resistance of 3400 ohms equivalent to 22 C When long cables are used the cable resistance may need to be taken into account Standard 22 AWG stranded coppe...

Page 14: ...R0 is the Initial Reading usually obtained at installation see section 2 4 G is the Calibration Factor usually in terms of millimeters or inches per digit F is an engineering units conversion factor optional see Table 1 From To Inches Feet Millimeters Centimeters Meters Inches 1 12 0 03937 0 3937 39 37 Feet 0 0833 1 0 003281 0 03281 3 281 Millimeters 25 4 304 8 1 10 1000 Centimeters 2 54 30 48 0 1...

Page 15: ...ined that the Thermal Ceofficient K changes with the position of the transducer shaft Hence the first step in the temperature correction process is determination of the proper Thermal Coefficient based on the following equation Thermal Coefficient Reading in Digits Multiplier Constant Calibration Factor K R1 M B G Equation 4 Thermal Coefficient Calculation See Table 2 for the Multiplier and Consta...

Page 16: ...le the corrections for temperature change are very small and can usually be ignored 4 3 Environmental Factors Since the purpose of the jointmeter installation is to monitor site conditions factors which may affect these conditions should always be observed and recorded Seemingly minor effects may have a real influence on the behavior of the structure being monitored and may give an early indicatio...

Page 17: ...oise nearby Most probable sources of electrical noise are motors generators transformers arc welders and antennas Make sure the shield drain wire is connected to ground whether using a portable readout or datalogger If using the GK 401 Readout connect the clip with the green boot to the bare shield drain wire of the pressure cell cable If using the GK 403 connect the clip with the blue boot to the...

Page 18: ...ture Range 40 to 60 C 40 to 120 F Frequency Range 1200 2800 Hz Coil Resistance 180 10 Cable Type 2 twisted pair 4 conductor 22 AWG Foil shield PVC jacket nominal OD 6 3 mm 0 250 Length compressed 441 mm 17 37 Maximum Diameter flange 63 5 mm 2 5 Tube Diameter 50 8 mm 2 0 Weight 1 5 kg 3 3 lb Table A 1 Embedment Jointmeter Specifications Notes Consult the factory for other ranges available Consult t...

Page 19: ...3 342 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...

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