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Instruction Manual
Model 4700
VW Temperature Gage
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.
Copyright © 1984, 2004 by Geokon, Inc.
(Doc Rev C, 9/07)
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Summary of Contents for Geokon 4700
- Page 1 VW Temperature Gage 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.
- Page 3 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.
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Page 5: Table Of Contents
TABLE of CONTENTS 1. Theory of Operation .............................. 1 2. Installation ................................1 3. Readout Procedures............................... 1 4. Data Reduction ..............................1 6. Specifications ................................ 2 Figure 1. Typical Calibration Sheet........................3 Appendix A: ................................4 APPENDIX B - HIGH-TEMPERATURE THERMISTOR LINEARIZATION............5... -
Page 7: Theory Of Operation
The theory of operation is described in the Model 4700 brochure. 2. Installation The Model 4700 Vibrating Wire Temperature Sensor can be installed inside boreholes, buried in fill, or cast inside concrete. They are fully waterproof. No particular requirements are needed. Preliminary readings should be taken to ensure that the sensor is functioning properly. -
Page 8: Specifications
6. Specifications Range Standard: –20°C to +80°C Optional: any 200°C span from –200°C to +200°C. Resolution 0.04°C (approximate) ±0.5% F.S. Accuracy Frequency Range 1400 – 3500 Hz Diameter 19mm Length 125mm Weight 115gm Cable 4 conductor shielded .22awg... - Page 9 Figure 1. Typical Calibration Sheet.
- Page 10 Appendix A: Thermistor Linearization using Steinhart and Hart Log Equation Tech Memo 91-03 Doc Rev 6-94, Geokon, Inc. Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3 − 273 2 Basic Equation: A B LnR C LnR T = Temperature in °C.
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Page 11: Appendix B - High-Temperature Thermistor Linearization
APPENDIX B - HIGH-TEMPERATURE THERMISTOR LINEARIZATION High Temperature Thermistor Linearization using SteinHart-Hart Log Equation − Thermistor Type: Thermometrics BR55KA822J Basic Equation:... - Page 12 T = Temperature in °C LnR = Natural Log of Thermistor Resistance Where: A = 1.02569 × 10 B = 2.478265 × 10 C = 1.289498 × 10 Temp Calculated Diff Temp Calculated Diff Temp Error Error (ohms) (ohms) Temp 113898 11.643 1578.342...
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