Geokon 4700 Manuel utilisateur

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.

(Doc Rev C, 9/07)

Warranty Statement

Geokon, Inc. warrants its products to be free of defects in materials and workmanship, under normal use 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 Geokon, if the unit is found to be defective, it will

be repaired or replaced at no charge. However, the WARRANTY is VOID if the unit shows evidence of having

been tampered with or shows evidence of being damaged as a result of excessive corrosion or current, heat,

moisture or vibration, improper specification, misapplication, misuse or other operating conditions outside of

Geokon's control. Components which wear or which are damaged by misuse are not warranted. This includes

fuses and batteries.

Geokon manufactures scientific instruments whose misuse is potentially dangerous. The instruments are intended

to be installed and used only by qualified personnel. There 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 the installation or use of the product. 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. for the unit or units, or equipment directly affected by such breach. Under no

circumstances will Geokon reimburse the claimant for loss incurred in removing and/or reinstalling equipment.

Every precaution for accuracy has been taken in the preparation of manuals and/or software, however,

Geokon, Inc. neither assumes responsibility for any omissions or errors that may appear nor assumes

liability for any damages or losses that result from the use of the products in accordance with the

information contained in the manual or software.

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

1. 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. Most models incorporate a thermistor that can be used as a

check on the vibrating wire readout.

3. Readout Procedures

Connect the black and red leads to the GK-401, GK-403 or GK-404 VW Readout Box and read on channel B. If

the GK-403 Readout Box, GK 404 Readout Box or Micro-10 Datalogger is used, the thermistor readout can be

displayed directly in °C. If a GK-401 Readout Box is used, the thermistor can be read on the green and white

conductors using a digital ohmmeter in conjunction with the conversion Table in Appendix A. Allowance for

cable resistance may be necessary (22 gage cable has a resistance of 20Ω/300 meters).

4. Data Reduction

The temperature (T) is given by the formula:

T = G (R0–R1)in degrees centigrade

Where: R0is the initial reading on channel B at 0°C

R1is the subsequent reading on channel B

Gis the gage factor

A typical calibration sheet showing the gage factor is given on page 3.

5. Trouble Shooting _______________________________________________

Maintenance and trouble shooting of vibrating wire temperature sensors are confined to periodic checks of cable

connections and maintenance of terminals. The transducers themselves are sealed and cannot be opened for

inspection.

•A normal resistance between black and red conduction is 180Ω± 5Ωplus cable resistance (20Ω/300m).

•A normal resistance between white and green conduction depends on the temperature (see table on page 4).

If the resistance deviates from the norms, inspect the cable for damage.

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)

Accuracy ±0.5% F.S.

Frequency Range 1400 – 3500 Hz

Diameter 19mm

Length 125mm

Weight 115gm

Cable 4 conductor shielded .22awg

Figure 1. Typical Calibration Sheet.

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

Basic Equation: TA B LnR C LnR

−

1273 2

()() .

where: T=Temperature in °C.

LnR =Natural Log of Thermistor Resistance

A=1.4051 ×10-3

B=2.369 ×10-4

C=1.019 ×10-7

Note: Coefficients calculated over -50

to +150

C. span.

Resistance versus Temperature Table

Ohms Temp Ohms Temp Ohms Temp Ohms Temp Ohms Temp

201.1K -50 16.60K -10 2417 +30 525.4 +70 153.2 +110

187.3K -49 15.72K -9 2317 31 507.8 71 149.0 111

174.5K -48 14.90K -8 2221 32 490.9 72 145.0 112

162.7K -47 14.12K -7 2130 33 474.7 73 141.1 113

151.7K -46 13.39K -6 2042 34 459.0 74 137.2 114

141.6K -45 12.70K -5 1959 35 444.0 75 133.6 115

132.2K -44 12.05K -4 1880 36 429.5 76 130.0 116

123.5K -43 11.44K -3 1805 37 415.6 77 126.5 117

115.4K -42 10.86K -2 1733 38 402.2 78 123.2 118

107.9K -41 10.31K -1 1664 39 389.3 79 119.9 119

101.0K -40 9796 0 1598 40 376.9 80 116.8 120

94.48K -39 9310 +1 1535 41 364.9 81 113.8 121

88.46K -38 8851 2 1475 42 353.4 82 110.8 122

82.87K -37 8417 3 1418 43 342.2 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 92 85.7 132

44.16K -27 5177 13 965.0 53 250.9 93 83.6 133

41.56K -26 4939 14 929.6 54 243.4 94 81.6 134

39.13K -25 4714 15 895.8 55 236.2 95 79.6 135

36.86K -24 4500 16 863.3 56 229.3 96 77.6 136

34.73K -23 4297 17 832.2 57 222.6 97 75.8 137

32.74K -22 4105 18 802.3 58 216.1 98 73.9 138

30.87K -21 3922 19 773.7 59 209.8 99 72.2 139

29.13K -20 3748 20 746.3 60 203.8 100 70.4 140

27.49K -19 3583 21 719.9 61 197.9 101 68.8 141

25.95K -18 3426 22 694.7 62 192.2 102 67.1 142

24.51K -17 3277 23 670.4 63 186.8 103 65.5 143

23.16K -16 3135 24 647.1 64 181.5 104 64.0 144

21.89K -15 3000 25 624.7 65 176.4 105 62.5 145

20.70K -14 2872 26 603.3 66 171.4 106 61.1 146

19.58K -13 2750 27 582.6 67 166.7 107 59.6 147

18.52K -12 2633 28 562.8 68 162.0 108 58.3 148

17.53K -11 2523 29 543.7 69 157.6 109 56.8 149

55.6 150

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