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Summary of Contents for Geokon 1450
- Page 1 Model 1450 DC-DC LVDT Displacement Transducer Instruction Manual ©GEOKON. All rights reserved. Document Revision: A | Release Date: 5/21/24.
- Page 3 WARRANTY STATEMENT warrants its products to be free of defects in materials and workmanship, under normal use GEOKON 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...
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Page 5: Table Of Contents
4. TAKING READINGS ....................8 4.1 MEASURING TEMPERATURES (MODEL 1100 APPLICATIONS): ............... 5. DATA REDUCTION....................9 6. TROUBLESHOOTING ....................10 APPENDIX A. SPECIFICATIONS................11 A.1 MODEL 1450 SPECIFICATIONS ............................A.2 MODEL 1450 DIMENSIONS ..............................A.3 OPTIONAL MOUNTING ACCESSORIES ......................... APPENDIX B. THERMISTOR TEMPERATURE DERIVATION ........13 B.1 3KΩ... -
Page 7: Introduction
This produces clean data with infinite resolution and gives the sensor a very long life. Model 1450 Transducers have all the benefits of the LVDT sensor principle with the added convenience of a DC (Direct Current) supply and output. -
Page 8: Applications
APPLICATIONS 2.1 TYPICAL PILE MONITORING Model 1450 LVDT Transducers can be used in place of or in concert with dial gauges to monitor displacements associated with pile load tests. Two configuration examples are shown below. Test Beams Steel Plate Hydraulic Jack Ram... -
Page 9: Model 1800 Telltales
2.2 MODEL 1800 TELLTALES Model 1450 LVDT Transducers can be used in place of, or in concert with, dial gauges to monitor piles and boreholes with the Model 1800 Telltale systems. The Model 1800 Telltale is a simple means of measuring displacement between two points, typically in a vertically oriented position. -
Page 10: Model 1100 Borehole Extensometers
2.3 MODEL 1100 BOREHOLE EXTENSOMETERS Model 1450 LVDT Transducers can be used in place of Model 4450 Displacement Transducers for the electronic readout of Model 1100 Borehole Extensometers. The LVDT transducers are assembled into the extensometer in-house, making for a simplified installation process in the field. Using this installation method the transducers can not be set at a specific point within their range and are usually used to read extension only. -
Page 11: Installation
INSTALLATION 3.1 INSTALLING THE TRANSDUCER The Model 1450 LVDT Transducer is useful in several different applications. Refer to the applicable installation sections below. ■ Section 3.1.1: Standard Installation (Typical Pile Monitoring and Installation With Model 1800 Telltales) ■ Section 3.1.2: Installation With Model 1100 Borehole Extensometers 3.1.1 STANDARD INSTALLATION... -
Page 12: Installation With Model 1100 Borehole Extensometers
To take readings, connect the readout cable to an ohmmeter and 6-18 Volt DC regulated power supply using the wiring chart in Appendix C. Warning! Incorrect connection may cause permanent and irreparable damage to the transducer. 6 | INSTALLATION | GEOKON... -
Page 13: Splicing And Junction Boxes
Consult and the Model 4999-12L/LE Instruction Manual for additional GEOKON information. Important! When using a Model 4999-12L for protection, power suppy voltage should be Model 4999-12L/LE limited to 12 Volts. MODEL 1450 DC-DC LVDT DISPLACEMENT TRANSDUCER | INSTALLATION | 7... -
Page 14: Taking Readings
For long cables a correction can be applied equal to approximately 48.5Ω per km (14.7Ω per 1000') at 20 °C. Multiply these factors by two to account for both directions Look up the temperature for the measured resistance in Appendix B. 8 | TAKING READINGS | GEOKON... -
Page 15: Data Reduction
0.867 millimeters EXAMPLE 2: Displacement Unit: inches If the sensitivity factor is 0.755 V/inch and transducer output is 0.55 Volts: 0.55 ------------ - 0.755 0.728 inches MODEL 1450 DC-DC LVDT DISPLACEMENT TRANSDUCER | DATA REDUCTION | 9... -
Page 16: Troubleshooting
Sensors should not be opened in the field. Should difficulties arise, consult the following list of problems and possible solutions. For additional troubleshooting and support visit geokon.com/Technical-Support. Technical Support SYMPTOM: THERMISTOR RESISTANCE IS TOO HIGH / TOO LOW (MODEL 1100 APPLICATIONS ONLY) □... -
Page 17: Appendix A. Specifications
3 mm (0.1”) 8 mm (0.3”) 15 mm (0.6”) Output Over-Travel 13 mm (0.51”) 10 mm (0.39”) 14 mm (0.55”) 15 mm (0.59”) TABLE 3: Model 1450 DC-DC LVDT Transducer Dimensions MODEL 1450 DC-DC LVDT DISPLACEMENT TRANSDUCER | SPECIFICATIONS | 11... -
Page 18: Optional Mounting Accessories
A.3 OPTIONAL MOUNTING ACCESSORIES A mounting bracket (Model 1450-7) and magnetic mounting base with swivel post (Model 1450-8) are available to facilitate mounting the LVDT sensors. Model 1450 Transducer Model 1450-8 Swivel Post with Magnetic Base Model 1450-7 Mounting Bracket... -
Page 19: Appendix B. Thermistor Temperature Derivation
162.0 56.8 20.70K 2750 562.8 157.6 55.6 19.58K 2633 543.7 153.2 18.52K 2523 525.4 149.0 17.53K 2417 507.8 145.0 16.60K 2317 490.9 141.1 TABLE 4: 3KΩ Thermistor Resistance MODEL 1450 DC-DC LVDT DISPLACEMENT TRANSDUCER | THERMISTOR TEMPERATURE DERIVATION | 13... -
Page 20: Appendix C. Wiring Charts For Model 1100 Borehole Extensometers
APPENDIX C. WIRING CHARTS FOR MODEL 1100 BOREHOLE EXTENSOMETERS These wiring charts are specific to Model 1100 Borehole Extensometers with Model 1450 DC-DC LVDT Displacement Transducers installed. Wiring charts are dependent on the quantity of transducers. Warning! Incorrect connection may cause permanent and irreparable damage to the transducer. - Page 21 LVDT 5 Output - Ohmmeter - White White Thermistor Red of White Red of White Thermistor Shields (8) Ground TABLE 9: Wiring for Five Transducers MODEL 1450 DC-DC LVDT DISPLACEMENT TRANSDUCER | WIRING CHARTS FOR MODEL 1100 BOREHOLE EXTENSOMETERS | 15...
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Page 22: Appendix D. Crbasic Programming
The following sample program reads one sensor. 'CR6 Datalogger with 8032 Multiplexer 'To read 4ea model 1450 RDP LVDTs connected to Multiplexer 'Zero readings and Gage factor are set to store Volts by default for 1450. 'Wiring: 'Multiplexer Enable U5... - Page 23 'Clock through MUX channels Parameter is either 16 or 32 channel mode. Call PulseP(16) 'Read Model 1450 Call ReadVolt Next 'Lower the control port to deactivate MUX port enabled PortSet (U5,2) 'Call Table to store Data CallTable (Table1) NextScan MODEL 1450 DC-DC LVDT DISPLACEMENT TRANSDUCER | CRBASIC PROGRAMMING | 17...
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Page 24: Appendix E. Typical Calibration Certificate
APPENDIX E. TYPICAL CALIBRATION CERTIFICATE FIGURE 11: Typical Calibration Certificate 18 | TYPICAL CALIBRATION CERTIFICATE | GEOKON... - Page 28 GEOKON Phone: +1 (603) 448-1562 GEOKON 48 Spencer Street Email: info@geokon.com is an ISO 9001:2015 Lebanon, New Hampshire Website: www.geokon.com registered company 03766, USA...
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