Geokon 4422 Instruction Manual Download Page 19

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Vibrating Wire Sensor Lead Grid - SAMPLE VALUES

Red

Black

White

Green

Shield

Red

N/A

≅50Ω

infinite

Black

≅50Ω

N/A

infinite

White

infinite

N/A

3000Ω

25°

infinite

Green

infinite

3000Ω

25°

N/A

infinite

Shield

infinite

N/A

Table 4 - Sample Resistance

Vibrating Wire Sensor Lead Grid - SENSOR NAME/##

Red

Black

White

Green

Shield

Red

Black

White

Green

Shield

Table 5 - Resistance Work Sheet

Summary of Contents for 4422

Page 1: ...ithout 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 2017 by Geokon Inc Doc Rev F 11 27 17 ...

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: ...s with 10 pin Bulkhead Connectors Attached 6 3 2 2 Sensors with Bare Leads 6 3 2 3 Operating the GK 405 6 3 3 GK 403 READOUT BOX OBSOLETE MODEL 7 3 3 1 Connecting Sensors with 10 pin Bulkhead Connectors Attached 7 3 3 2 Connecting Sensors with Bare Leads 7 3 3 3 Operating the GK 403 7 3 4 MEASURING TEMPERATURES 7 4 DATA REDUCTION 8 4 1 DISPLACEMENT CALCULATION 8 4 2 TEMPERATURE CORRECTION 9 4 3 EN...

Page 6: ...CALIBRATION SHEET 11 TABLES TABLE 1 CRACKMETER READING RANGES 2 TABLE 2 ENGINEERING UNITS CONVERSION FACTORS 8 TABLE 3 THERMAL COEFFICIENT CALCULATION CONSTANTS 9 TABLE 4 SAMPLE RESISTANCE 13 TABLE 5 RESISTANCE WORK SHEET 13 TABLE 6 THERMISTOR RESISTANCE VERSUS TEMPERATURE 15 EQUATIONS EQUATION 1 DIGITS CALCULATION 8 EQUATION 2 DEFORMATION CALCULATION 8 EQUATION 3 THERMALLY CORRECTED DEFORMATION C...

Page 7: ...ned to be read by one of the various readout boxes available from Geokon 2 INSTALLATION 2 1 Preliminary Tests Upon receipt of the instrument the gage should be checked for proper operation including the thermistor The Crackmeter normally arrives with its shaft secured at approximately 50 of its range by the metal pin placed inside the middle of the three holes see Figure 1 This holds the instrumen...

Page 8: ...ange Reading Approximate Reading to Measure Extensions Approximate Reading to Measure Compression 4500 5000 2500 3000 6500 7000 Table 1 Crackmeter Reading Ranges 2 2 1 Drill Hole Type For the standard range crackmeter 4 mm drill two 9 mm 3 8 diameter holes spaced 110 mm 4 3 8 apart to a depth of 25 mm one inch A drill hole spacer bar is provided to make this easier Drill one hole then place a slig...

Page 9: ... to moving equipment debris or other causes The cable can be protected by the use of flexible conduit which can be supplied by Geokon Terminal boxes with sealed cable entries are available from Geokon for all types of applications These allow many gages to be terminated at one location with complete protection of the lead wires The interior panel of the terminal box can have built in jacks or a si...

Page 10: ...own the cable to the gage and possibly destroy it Suggested Lightning Protection Options If the instrument 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 the installation of thes...

Page 11: ...screen will displayed 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 by the POS button displayed as a letter A through F The current Reading Set by the MODE button displayed as a numeric value followed by the unit of measure Temperature...

Page 12: ...the male connector until it locks into place 3 2 2 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 sign...

Page 13: ...igit may change one or two digits while reading 4 The thermistor reading will be displayed above the gage reading in degrees centigrade 5 Press the Store button to record the value displayed If the no reading displays or the reading is unstable see Section 5 for troubleshooting suggestions The unit will automatically turn off after approximately two minutes to conserve power 3 4 Measuring Temperat...

Page 14: ...ing units conversion factor see Table 2 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 10 1 100 Meters 0 0254 0 3048 0 001 0 01 1 Table 2 Engineering Units Conversion Factors For example if the initial reading R0 is 4000 digits the current reading R1 is 5000 and the g...

Page 15: ...perature coefficient of the mass or member to which the Crackmeter is attached should also be taken into account By correcting the transducer for temperature changes the temperature coefficient of the mass or member may be distinguished Tests have determined that the thermal coefficient K changes with the position of the transducer shaft Hence the first step in the temperature correction process i...

Page 16: ...ronmental Factors Since the purpose of the crackmeter installation is to monitor site conditions factors that 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 indication of potential problems Some of these factors include but are not limited to blasting rainfal...

Page 17: ...11 Figure 6 Typical 4422 Monument Crackmeter Calibration Sheet ...

Page 18: ...he transducer shaft is fully retracted with the alignment pin inside the alignment slot the readings will likely be unstable because the vibrating wire is under tensioned Is there a source of electrical noise nearby Likely candidates are generators motors arc welding equipment high voltage lines etc If possible move the instrument cable away from power lines and electrical equipment or install ele...

Page 19: ...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 4 Sample Resistance Vibrating Wire Sensor Lead Grid SENSOR NAME Red Black White Green Shield Red Black White Green Shield Table 5 Resistance Work Sheet ...

Page 20: ...F Frequency Range 1200 2800 Hz Coil Resistance 50 Ω 5 Ω Cable Type Two twisted pair four conductor 22 AWG Foil shield PVC jacket nominal OD 6 3 mm 0 250 Cable Wiring Code Red and Black are the VW Sensor White and Green the Thermistor Length midrange end to end 120 mm 4 75 in Notes Minimum greater resolution possible depending on readout Depends on application Polyurethane jacketed cable available ...

Page 21: ...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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