Geokon 3810 Manuel utilisateur

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 E, 04/07/17)

Installation Manual

Model 3800/3810

Thermistors & Thermistor Strings

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. 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.

Contents

CONTENTS.......................................................................................................................................................1

1. INTRODUCTION.......................................................................................................................................1

2. INSTALLATION........................................................................................................................................1

3. READOUT.................................................................................................................................................1

4. DATALOGGER CONNECTION...............................................................................................................1

FIGUREA‐1:THERMISTORBRIDGEWIRING......................................................................................................2

TABLEB‐1:STANDARDTHERMISTORRESISTANCEVERSUSTEMPERATURE.......................................................4

TABLEB‐2:HIGHTEMPERATURETHERMISTORRESISTANCEVERSUSTEMPERATURE.........................................6

1. Introduction ______________________________________________________________

Thermistors are semiconductors, which behave as thermal resistors – that is, resistors with a

high (usually negative) temperature coefficient of resistance. The thermistor beads are made

from a mixture of metal oxides encased in epoxy or glass. The beads are small in size and

extremely robust with a high degree of stability over a long life span. Because their resistance

change is so great, it is unusual for cable effects to be significant. However, for high accuracy

work the cable resistance can be taken into account. Accuracies of the types of thermistor

beads used here is, +/- 0.5°C, (Model 3800-1-1-1), or +/- 0. 2°C( Model 3800-1-2-1). Standard

temperature ranges are -50 to 150 degrees C . High temperature versions are -30 to 230

degrees C.

2. Installation _______________________________________________________________

Model 3800-1-1, and Model 3800-1-2 thermistors are supplied inside a housing already potted

on the end of a cable ready to be attached to a structure or buried in the ground or in concrete.

The potting chamber is made from PVC for low temperature models or from stainless steel for

the high temperature models. Model 3810 Thermistor strings are made by removing a short

length of the outer jacket of a multi-pair conductor cable, at pre-determined depths; splicing a

Model 3800-1-1-1 into one of the pairs of conductors, then waterproofing the splice. Before

Installation read and record all the thermistors to check that they are functional and to establish

ambient temperature readings. Read and record once again as soon as the thermistor string has

been deployed and again after a certain length of time has elapsed to allow the temperatures

stabilize so as to establish good base line temperature readings.

3. Readout_________________________________________________________________

Thermistors can read using either a GK 403 or GK 404 readout box, which display the

temperature directly in degrees Celsius. Alternatively, for standard thermistors, rated at –50 to

+150 degrees Celsius a digital ohmmeter can be used in conjunction with the Table B1 shown

on the next page. High temperature thermistors can be read in a similar manner using Table B2

Note that if long cables are use it may be necessary to correct for the cable resistance. Standard

cable is 22 AWG with a resistance of 16 ohms per 1000ft. Remember, when calculating the

cable effect to count the distance there and back.

4. Datalogger Connection _____________________________________________________

A Multiplexer (Model 8032) is required to connect the Model 3810 Thermistor string to a

Datalogger (Model 8021/8025). The Common connection of the Thermistor String limits the

ability to connect the string directly to a Datalogger. A jumper is required on each channel of the

Multiplexer in order to split the Common between all of the Thermistors in the string.

-CR1000/CR800 Wiring for Model 8032 reading Thermistor String in 32ch mode

CR1000/CR800 Datalogger 8032 Multiplexer Description

12V 12V 12VDC Output

G G Power Ground

C# RES Control Port # / Reset

C# CLK Digital I/O Port # / Clock

AG AG Analog Ground

*SE# 1H Single Ended CH# input

for Thermistor

*VX# 1L Excitation VX#

* NOTE: The Thermistors are read using a Single Ended Channel and Excited with one of

the dataloggers excitation channels through a bridge completion circuit.

Figure A-1: Thermistor Bridge Wiring

NOTE: The DIP Switches for the 8032 Multiplexer should be set for 32 Channel mode.

Each individual Thermistor is connected (with common jumper) as shown below.

Multiplexer Wiring:

8032 Multiplexer Model 3800/3810

IH Thermistor Gage 1

1L Thermistor Common *

2H Thermistor Gage 2

2L Thermistor Common *

S Shield

3H Thermistor Gage 3

3L Thermistor Common *

NOTE: * Jumper required

Standard Temperature Thermistor Linearization using SteinHart-Hart Log Equation

Thermistor Type: YSI 44005, Dale #1C3001-B3, Alpha #13A3001-B3

Resistance to Temperature Equation: 2.273

)()( 13



LnRCLnRBA

Equation B-1: Convert Thermistor Resistance to Temperature

Where: TTemperature in C

LnR Natural Log of Thermistor Resistance

A1.4051 10-3 (coefficients calculated over the 50 to +150C span)

B2.369 10-4

C1.019 10-7

Ohms Temp Ohms Temp Ohms Temp Ohms Temp Ohms Temp

201.1

-50 16.60

-10 2417



30 525.4



70 153.2



110

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

174.5

-48 14.90

-8 2221 32 490.9 72 145.0 112

162.7

-47 14.12

-7 2130 33 474.7 73 141.1 113

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

141.6

-45 12.70

-5 1959 35 444.0 75 133.6 115

132.2

-44 12.05

-4 1880 36 429.5 76 130.0 116

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

115.4

-42 10.86

-2 1733 38 402.2 78 123.2 118

107.9

-41 10.31

-1 1664 39 389.3 79 119.9 119

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

94.48

-39 9310 1 1535 41 364.9 81 113.8 121

88.46

-38 8851 2 1475 42 353.4 82 110.8 122

82.87K -37 8417 3 1418 43 342.2 83 107.9 123

77.66

-36 8006 4 1363 44 331.5 84 105.2 124

72.81

-35 7618 5 1310 45 321.2 85 102.5 125

68.30K -34 7252 6 1260 46 311.3 86 99.9 126

64.09

-33 6905 7 1212 47 301.7 87 97.3 127

60.17

-32 6576 8 1167 48 292.4 88 94.9 128

56.51K -31 6265 9 1123 49 283.5 89 92.5 129

53.10

-30 5971 10 1081 50 274.9 90 90.2 130

49.91

-29 5692 11 1040 51 266.6 91 87.9 131

46.94K -28 5427 12 1002 52 258.6 92 85.7 132

44.16

-27 5177 13 965.0 53 250.9 93 83.6 133

41.56

-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

36.86

-24 4500 16 863.3 56 229.3 96 77.6 136

34.73

-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

30.87

-21 3922 19 773.7 59 209.8 99 72.2 139

29.13

-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

25.95

-18 3426 22 694.7 62 192.2 102 67.1 142

24.51

-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

21.89

-15 3000 25 624.7 65 176.4 105 62.5 145

20.70

-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

18.52

-12 2633 28 562.8 68 162.0 108 58.3 148

17.53

-11 2523 29 543.7 69 157.6 109 56.8 149

55.6 150

Table B-1: Standard Thermistor Resistance versus Temperature

Ce manuel convient aux modèles suivants

Table des matières

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