CR1000 Manual - Campbell Scientific

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Section 8. Operation Figure 93: Panel-temperature gradients (low temperature to high) Figure 94: Panel-temperature gradients (high temperature to low) 8.1.4.1.2 Thermocouple Limits of Error The standard reference that lists thermocouple output voltage as a function of temperature (reference junction at 0°C) is the NIST (National Institute of 304
Section 8. Operation Standards and Technology) Monograph 175 (1993). ANSI (American National Standards Institute) has established limits of error on thermocouple wire which is accepted as an industry standard (ANSI MC 96.1, 1975). Table Limits of Error for Thermocouple Wire (p. 305) gives the ANSI limits of error for standard and special grade thermocouple wire of the types accommodated by the <strong>CR1000</strong>. When both junctions of a thermocouple are at the same temperature, no voltage is generated, a result of the law of intermediate metals. A consequence of this is that a thermocouple cannot have an offset error; any deviation from a standard (assuming the wires are each homogeneous and no secondary junctions exist) is due to a deviation in slope. In light of this, the fixed temperature-limits of error (e.g., ±1.0°C for type T as opposed to the slope error of 0.75% of the temperature) in the table above are probably greater than one would experience when considering temperatures in the environmental range (i.e., the reference junction, at 0°C, is relatively close to the temperature being measured, so the absolute error — the product of the temperature difference and the slope error — should be closer to the percentage error than the fixed error). Likewise, because thermocouple calibration error is a slope error, accuracy can be increased when the reference junction temperature is close to the measurement temperature. For the same reason differential temperature measurements, over a small temperature gradient, can be extremely accurate. To quantitatively evaluate thermocouple error when the reference junction is not fixed at 0°C limits of error for the Seebeck coefficient (slope of thermocouple voltage vs. temperature curve) are needed for the various thermocouples. Lacking this information, a reasonable approach is to apply the percentage errors, with perhaps 0.25% added on, to the difference in temperature being measured by the thermocouple. Table 64. Limits of Error for Thermocouple Wire (Reference Junction at 0°C) Thermocouple Temperature Limits of Error (Whichever is greater) Type Range°C Standard Special T -200 to 0 ± 1.0°C or 1.5% 0 to 350 ± 1.0°C or 0.75% ± 0.5°C or 0.4% J 0 to 750 ± 2.2°C or 0.75% ± 1.1°C or 0.4% E -200 to 0 ± 1.7°C or 1.0% 0 to 900 ± 1.7°C or 0.5% ± 1.0°C or 0.4% K -200 to 0 ± 2.2°C or 2.0% 0 to 1250 ± 2.2°C or 0.75% ± 1.1°C or 0.4% R or S 0 to 1450 ± 1.5°C or 0.25% ± 0.6°C or 0.1% B 800 to 1700 ± 0.5% Not Established. 8.1.4.1.3 Thermocouple Voltage Measurement Error Thermocouple outputs are extremely small — 10 to 70 µV per °C. Unless high resolution input ranges are used when programming, the <strong>CR1000</strong>, accuracy and sensitivity are compromised. Table Voltage Range for Maximum Thermocouple 305
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CR1000 Measurement and Control Syst
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Assistance Products may not be retu
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Table of Contents Section 5. System
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Table of Contents 7.7.3.4 Single-Li
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Table of Contents A.21 User Defined
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Table of Contents Table 19. Binary
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Table of Contents Table 125. Standa
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Table of Contents CRBasic Example 6
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Section 1. Introduction Italic —
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Section 2. Cautionary Statements 30
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Section 3. Initial Inspection 32
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Section 8. Operation A: Compressing
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Section 8. Operation 8.10 CF Cards
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Section 9. Maintenance 9.1 Moisture
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Section 9. Maintenance Figure 131:
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Section 9. Maintenance For all retu
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Section 10. Troubleshooting 10.1 St
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Section 10. Troubleshooting Table 1
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Section 10. Troubleshooting 10.3.1.
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Section 10. Troubleshooting CRBasic
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Section 10. Troubleshooting mid = (
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Section 10. Troubleshooting 10.5 Po
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Section 10. Troubleshooting Battery
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Section 10. Troubleshooting Adjusti
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Section 10. Troubleshooting As show
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Section 10. Troubleshooting Figure
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Section 11. Glossary 11.1 Terms ac
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Section 11. Glossary Cache Data The
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Section 11. Glossary CR10X Older ge
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Section 11. Glossary dimension To c
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Section 11. Glossary integer A numb
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Section 11. Glossary output interva
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Section 11. Glossary Public A CRBas
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Section 11. Glossary Seebeck Effect
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Section 11. Glossary Station Status
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Section 11. Glossary terminal emula
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Section 11. Glossary watchdog timer
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Appendix A. CRBasic Programming Ins
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Appendix B. Status Table and Settin
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Appendix C. Serial Port Pinouts C.1
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Appendix C. Serial Port Pinouts Tab
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Appendix D. ASCII / ANSI Table Amer
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Appendix D. ASCII / ANSI Table Dec
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Appendix E. FP2 Data Format FP2 dat
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Appendix F. Other Campbell Scientif
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Index 1 12V Terminal...............
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Index Communications Memory Errors
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Index Expression...................
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Index IP Information...............
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Index PanelTemp....................
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Index Runtime Errors...............
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Index TCDiff ......................
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