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LM335 Datasheet(PDF) 13 Page - Texas Instruments |
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LM335 Datasheet(HTML) 13 Page - Texas Instruments |
13 / 28 page LM135, LM135A, LM235, LM235A, LM335, LM335A www.ti.com SNIS160E – MAY 1999 – REVISED FEBRUARY 2015 System Examples (continued) 8.3.1 Thermocouple Cold Junction Compensation Compensation for Grounded Thermocouple Select R3 for proper thermocouple type Figure 24. Thermocouple Cold Junction Compensation THERMO-COUPLE R3 (±1%) SEEBECK COEFFICIENT J 377 Ω 52.3 μV/°C T 308 Ω 42.8 μV/°C K 293 Ω 40.8 μV/°C S 45.8 Ω 6.4 μV/°C Adjustments: Compensates for both sensor and resistor tolerances 1. Short LM329B 2. Adjust R1 for Seebeck Coefficient times ambient temperature (in degrees K) across R3. 3. Short LM335 and adjust R2 for voltage across R3 corresponding to thermocouple type. J 14.32 mV K 11.17 mV T 11.79 mV S 1.768 mV THERMO-COUPLE R3 R4 SEEBECK COEFFICIENT J 1.05K 385 Ω 52.3 μV/°C T 856 Ω 315 Ω 42.8 μV/°C K 816 Ω 300 Ω 40.8 μV/°C S 128 Ω 46.3 Ω 6.4 μV/°C Adjustments: 1. Adjust R1 for the voltage across R3 equal to the Seebeck Coefficient times ambient temperature in degrees Kelvin. 2. Adjust R2 for voltage across R4 corresponding to thermocouple. J 14.32 mV T 11.79 mV K 11.17 mV S 1.768 mV Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: LM135 LM135A LM235 LM235A LM335 LM335A |
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