Geokon 4370 Instruction Manual Download Page 18

APPENDIX B. THERMISTOR TEMPERATURE DERIVATION 

 

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

Resistance to Temperature Equation: 

 

T=

1

A+B

(

LnR

)

+C(LnR)

3

-273.15 °C

 

 

Equation 4 - Resistance to Temperature 

 

Where;   

=

 Temperature in 

°

C. 

LnR 

=

 Natural Log of Thermistor Resistance. 

=

 1.4051 

×

 10-3 (coefficients calculated over the 

50 to +150

°

 C. span) 

=

 2.369 

×

 10-4  

=

 1.019 

×

 10-7  

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 

1598 

40 

376.9 

80 

116.8 

120 

94.48K 

-39 

9310 

+

1535 

41 

364.9 

81 

113.8 

121 

88.46K 

-38 

8851 

1475 

42 

353.4 

82 

110.8 

122 

82.87K 

-37 

8417 

1418 

43 

342.2 

83 

107.9 

123 

77.66K 

-36 

8006 

1363 

44 

331.5 

84 

105.2 

124 

72.81K 

-35 

7618 

1310 

45 

321.2 

85 

102.5 

125 

68.30K 

-34 

7252 

1260 

46 

311.3 

86 

99.9 

126 

64.09K 

-33 

6905 

1212 

47 

301.7 

87 

97.3 

127 

60.17K 

-32 

6576 

1167 

48 

292.4 

88 

94.9 

128 

56.51K 

-31 

6265 

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 

 

Table 2 - Thermistor Resistance versus Temperature

 

55.6

 

150 

Summary of Contents for 4370

Page 1: ...means without the written consent of Geokon The information contained herein is believed to be accurate and reliable However Geokon assumes no responsibility for errors omissions or misinterpretation The information herein is subject to change without notification Copyright 2003 2019 by Geokon Doc Rev G 05 1 19 ...

Page 2: ......

Page 3: ...nnel 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 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 ...

Page 4: ......

Page 5: ...ors 6 3 2 2 Operating the GK 405 6 3 3 GK 403 READOUT BOX OBSOLETE MODEL 7 3 3 1 Connecting Sensors 7 3 3 2 Operating the GK 403 7 3 4 MEASURING TEMPERATURES 7 6 DATA REDUCTION 8 6 1 STRESS CALCULATION 8 6 2 TEMPERATURE CORRECTION 9 7 TROUBLESHOOTING 10 APPENDIX A SPECIFICATIONS 11 A 1 4370 CONCRETE STRESSMETER 11 A 2 THERMISTOR 11 APPENDIX B THERMISTOR TEMPERATURE DERIVATION 12 APPENDIX C TYPICAL...

Page 6: ...NG PROTECTION SCHEME 4 FIGURE 6 LEMO CONNECTOR TO GK 404 5 FIGURE 7 LIVE READINGS RAW READINGS 6 FIGURE 8 TYPICAL CALIBRATION REPORT 13 TABLES TABLE 1 4370 SPECIFICATIONS 11 TABLE 2 THERMISTOR RESISTANCE VERSUS TEMPERATURE 12 EQUATIONS EQUATION 1 DIGITS TO CONCRETE STRESS LINEAR EQUATION 8 EQUATION 2 DIGITS TO CONCRETE STRESS POLYNOMIAL EQUATION 9 EQUATION 3 POLYNOMIAL GAUGE FACTOR C 9 EQUATION 4 ...

Page 7: ...own in Figure 1 Figure 1 The Model 4370 Concrete Stressmeter In essence the stressmeter comprises a short vibrating wire load cell in series with an 18 inch long cylinder of concrete This concrete cylinder has the same properties as the surrounding concrete but is de bonded from it by means of a smooth walled porous plastic tube and is coupled at its ends to the surrounding concrete by means of a ...

Page 8: ... 2 shows the far end of the stress meter is left open so that when the concrete is poured around the stressmeter the cell can be untied from the rebar and held vertical so that the same concrete can be packed inside the cell and then the end flange is pushed inside the end of the tube and securely taped in place It is of the utmost importance that there be no spaces left inside the cell so the con...

Page 9: ...Figure 4 Another typical stress meter installation ...

Page 10: ...o 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 installation of these components Lighting arrestor boards and enclosures are available from Geokon that install at the exit point of the instrume...

Page 11: ...nsor conductors with blue representing the shield bare To turn the GK 404 on press the ON OFF button on the front panel of the unit The initial startup screen will be 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 b...

Page 12: ... into place Connecting 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 2 Operating the GK 405 Press the button labeled POWER ON A blue light will begin blinking signifying that the Remote Module is waiti...

Page 13: ...ion B 2 Turn the unit on 3 The readout will display the vibrating wire output in digits The last digit may change one or two digits while reading 4 The thermistor reading will be displayed above the gauge 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 7 for troubleshooting suggestions The unit w...

Page 14: ...nstallation just before the concrete is poured NOTE For greater accuracy use the regression zero found on the calibration report as R0 G is the linear gauge factor in MPa digit or psi digit taken from the calibration report The cross sectional area of the Stressmeter is equal to 5 31 sq in For example If Initial field zero reading 7035 digits Regression zero 7071 R1 5219 digits G 0 01748 MPa digit...

Page 15: ...are the polynomial gauge factors in MPa digit or psi digit taken from the calibration report For example If A 6 568E 07 MPa digit B 0 009799 MPa digit Initial field zero reading 7035 digits Current reading 5219 digits Then C 6 568E 07 7035 2 0 009799 7035 101 44 And the calculated concrete stress using S 6 658E 07 5219 2 0 009799 5219 101 44 32 41 MPa Compare these values to the actual applied str...

Page 16: ...way from the installation or install electronic filtering Make sure the shield drain wire is connected to ground whether using a portable readout or datalogger Does the readout work with another gauge If not the readout may have a low battery or be malfunctioning Symptom Strain gauge Fails to Read Is the cable cut or crushed This can be checked with an ohmmeter Nominal resistance between the two g...

Page 17: ...MPa to 25 Mpa Resolution 10 kPa Accuracy1 0 25 F S Temperature Range2 20 to 80 C Length Diameter 600 76 mm I D 66 mm Table 1 4370 Specifications Notes 1 Load cell accuracy 2 Other ranges available on request A 2 Thermistor See Appendix B also Range 80 to 150 C Accuracy 0 5 C ...

Page 18: ...3 107 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 ...

Page 19: ...APPENDIX C TYPICAL CALIBRATION REPORT Figure 8 Typical Calibration Report ...

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