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N_06P00472 Datasheet(PDF) 28 Page - AVX Corporation |
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N_06P00472 Datasheet(HTML) 28 Page - AVX Corporation |
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28 / 38 page  27 NTC Leadless Disc Thermistors Types NR Marking On package only / On parts upon request Operating temperature -40°C to +200°C Custom - designed products defined with: Values and tolerances D ± ΔDR 1 ± ΔR 1/R1 at T1 E ± ΔE R 2 ± ΔR 2/R2 at T2, . . . DESIGN OF THE THERMISTOR Choice of the resistances If the application is to measure the temperature around a defined point, a unique nominal resistance can be chosen (for example, among standard values of the ND range prod- ucts presented on pages 20 to 24). When it is required to measure the temperature over selected ranges T 1 –T2 , T2 –T3 , ..., the corresponding resistance R 1 , R2 , R3 , ..., must be such that they can be located on the R (T) characteristic of an existing NTC material (for example among standard materials whose R (T) are displayed on pages 29 to 33). The resistances must also be compatible with the resistivity of the material and the dimensions of the thermistor. Choice of the tolerances The precision of the temperature measurement determines the calculation of the tolerance on the resistance: R/R = (%/°C). T (°C) For example, the NTC NR55--3049-99, using “N5” material (R (T) characteristic displayed on page 31), requires a preci- sion of 1°C over the temperature range 110°C - 120°C. The tolerances can be calculated: R110°C /R110°C = 1°C* 2.91%/°C = 2.91% R120°C /R120°C = 1°C* 2.76%/°C = 2.76% *For your specific requirements, please consult us. D Metallization E Physical data (dim. in mm) HOW TO ORDER NR55 - Type - 3002 - 99 P/N Code This type of product is widely used in automotive and consumer applications. They are assembled in custom-probes for sensing the temperature of liquids (water, oil, ...), gases or surface of any other component. The metallization covers completely the surfaces of the thermistor. The particularly flat and smooth surfaces ensure an excellent electrical and thermal contact under pressure. |
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