CGEO INTERNATIONAL LIMITED CGEO-SG5 Скачать руководство пользователя страница 16

CGEO-SG5

 

Rebar VW Strain Gauge                                                                                                                                        15 

CGEO INTERNATIONAL LIMITED 

                                                                              Installation Manual           

APPENDIX B - THERMISTOR TEMPERATURE DERIVATION 

 

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

 

 

Resistance to Temperature Equation:

 

 

 

 

 

 

 

   

 

 

   

 

2732. 

 

 

 

   

 

 

 

 

 

3

 

 

 

 

  

 

 

 

  A 

 B(LnR) 

C(LnR)   

 

 

 

  

 

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

 

 

 

201.1K

 

-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

 

 

Table B-1 Thermistor Resistance versus Temperature 

 

Содержание CGEO-SG5

Страница 1: ...CGEO INTERNATIONAL LIMITED Model CGEO SG5 Rebar Vibrating Wire Strain Gauge Installation Manual ...

Страница 2: ...CGEO SG5 Rebar VW Strain Gauge 1 CGEO INTERNATIONAL LIMITED Installation Manual ...

Страница 3: ... 2 2 2 Model CGEO SG5 12 Sister Bar 6 2 3 Cable Installation 7 3 TAKING READINGS 8 3 1 Operation of the BSIL RO VW Readout Box 8 3 2 Measuring Temperatures 8 4 DATA REDUCTION 9 4 1 Strain Calculation 9 4 2 Temperature Correction 9 4 3 Environmental Factors 10 5 TROUBLESHOOTING 13 APPENDIX A SPECIFICATIONS 14 A 1 Rebar Strain Gauges 14 A 2 Thermistor see Appendix B also 14 APPENDIX B THERMISTOR TEM...

Страница 4: ... a compression fitting See Figure 1 Rebar Strain Gauge Body Strain Gage Electromagnetic Coil Heat Shrink Weld Rebar Weld Thermistor Compression Fitting Instrument Cable 900 mm Figure 1 Model CGEO SG5 Rebar Strain Gauge The Model CGEO SG5 12 diameter 12 Vibrating Wire Rebar Strain Gauge or Sister Bar consists of a short length of high strength steel welded between two long sections of reinforcing b...

Страница 5: ...t differ by more than about 25 digits 10 microstrain Shipping shocks may however cause larger shifts If the reading is within 100 digits 40 microstrain of the factory zero and is stable it is safe to proceed with the installation By pulling on the Strain Gauge it should be possible to change the readout digits causing them to rise as tension increases Checks of electrical continuity can also be ma...

Страница 6: ...ags between the weld area and the coil housing Also take care not to damage or burn the instrument cable when welding After welding route the instrument cable along the rebar system and tie it off every 3 4 feet 1 meter using nylon cable ties Avoid using iron tie wire to secure the cable as the cable could be cut Be sure when installing the Strain Gauges to note the location and serial numbers of ...

Страница 7: ... Figures 4 and 5 Route the instrument cable along the rebar system and tie it off every 3 4 feet 1 meter using nylon cable ties Avoid using the tie wire on the instrument cable as it could cut the cable Be sure when installing the Strain Gauges to note the location and serial numbers of all instruments This is necessary for applying the proper calibration factors and determining load characteristi...

Страница 8: ...As noted in the installation sections route the instrument cables along the structural rebar and tie off using nylon cable ties every 2 3 feet 1 meter to secure Outside of the instrumented structure the cable should be protected from accidental damage caused by moving equipment or other construction activity Cables may be spliced to lengthen them without affecting gage readings Always waterproof t...

Страница 9: ...gestions The thermistor will be read and output directly in degrees centigrade 3 Turn off the readout Or the unit will automatically turn itself off after approximately 15 minutes to conserve power 3 2 Measuring Temperatures Each Vibrating Wire Rebar Strain Gauge is equipped with a thermistor for reading temperature The thermistor gives a varying resistance output as the temperature changes Usuall...

Страница 10: ...t reading R1 of 7700 and a calibration factor G of 0 718439 microstrain per digit F 7700 8000 0 718439 215 5217 compression Symbol rule compression tension 4 2 Temperature Correction Rebar Strain Gauges are usually embedded in concrete and strained by the concrete the assumption being that the strain in the meter is equal to the strain in the concrete When the temperature changes the concrete expa...

Страница 11: ...of the Strain Gauge installation is to monitor site conditions factors which may affect these conditions should be observed and recorded Seemingly minor effects may have a real influence on the behavior of the structure being monitored and may give an early indication of potential problems Some of these factors include but are not limited to blasting rainfall tidal or reservoir levels excavation a...

Страница 12: ...8 02 0 05 28 01 0 03 35 0 6223 5 6222 5 6222 7 6222 9 34 98 0 05 35 00 0 01 Linear F G R1 R0 K T1 T0 Polynomial F AR1 2 BR1 C K T1 T0 kN Linear Gage Factor G 0 019589kN Digit kN Polynomial Gage Factor A B C Thermal Factor K 0 01517kN R0 Original reading T0 Original temperature CGEO INTERNATIONAL LIMITED Room 06 13A F South Tower World Finance Centre HarbourCity 17 Canton Road Tsim Sha Tsui Kowloon...

Страница 13: ...CGEO SG5 Rebar VW Strain Gauge 12 CGEO INTERNATIONAL LIMITED Installation Manual Figure 6 Sample Model CGEO SG5 Calibration Sheet ...

Страница 14: ...obable sources of electrical noise are motors generators and antennas Make sure the shield drain wire is connected to ground whether using a portable readout or datalogger Check whether the connection of readout and strain gauge s leads is well Does the readout work with another Strain Gauge If not the readout may have a low battery or be malfunctioning Symptom Strain Gauge Fails to Read Is the ca...

Страница 15: ...Pa 2000με Diameter 12mm 14 16 18 20 22 25 28 32 36 40mm 25 28 32 36 40mm Accuracy 0 25 F S Resolution 0 016 F S Temperature Range 20 80 Water Proof customized 0 5 2MPa available or others Connecting Bar high strength whorl steel or steel Table A 1 Model CGEO SG5 Rebar Strain Gauge Specifications Notes Consult the factory for other sizes available A 2 Thermistor see Appendix B also Range 80 to 150 ...

Страница 16: ... 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 8...

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