0000117145 00000 n Vishay Dale NTC Thermistors, Resistance/Temperature Conversion www.vishay.com For technical questions, contact: thermistor1@vishay.com Document Number: 33011 12 Revision: 18-Jun-10 CURVE 3 R/T CONVERSION TABLE Rt/R25 TEMP. X��c�1 �C1C8� C4C3�SF'�u\^\�/Zt�k�{y��s�����e�7�`جw�� �����XM��u. 59 0 obj <>stream 0000017860 00000 n Following on from "Testing a boiler thermistor" in Thermistors, please use the readings in the table below as an approximate expected multimeter reading of different thermistors from from the respective model as indicated.Manufacturers include Ravenheat, Radiant, Saunier Duval, Sime, Viessman, Vaillant, Vokera, Worcester, Thermistor Resistance Chart . 0000068994 00000 n In the typical control range (0°C to 40°C), 10K thermistors offer good sensitivity to changes in temperature, and this is the range in which most 10K thermistors are typically used. 0 10000 20000 30000 40000 50000-10.00 10.00 30.00 50.00 70.00 90.00 110.00 Resistance (Ω) Temperature (°C) °C Rt/R25 TEMP. 0000116810 00000 n 0000128823 00000 n 0000117056 00000 n An example of a thermistor output curve can be seen in Figure 1. 0000002680 00000 n 72 A - 10K3A1 Sensor type: Thermistor, temp coef. 0000145393 00000 n of ±0-2°C interchangeable thermistor. 0000012133 00000 n NTC Thermistors. The lowering, or rise, depends on the type of thermistor per degree Kelvin. 100 ohm Platinum RTD Fahrenheit Temp Resis Temp Resis Temp Resis Temp Resis Temp Resis-40 84.27 19 97.18 78 109.95 137 122.60 196 135.13 3k 10kType 10kType 10kDale 10k3A210kG US 20k. PN 1600-10K Thermistor Thermistor Resistance vs Temperature Chart The enclosed negative temperature coefficient (NTC) thermistor, pn 1600-10K. Therefore thermistors can have the same reference resistance of 10,000 Ω at 25 Deg C (R25) but can have different B values, so both values are needed to identify a thermistor. 0000096738 00000 n Another way to calculate the Thermistor RT Curve is to use the Steinhart-Hart method. 0000103455 00000 n 0000087671 00000 n The term thermistor is a contraction of the words "thermal" and "resistor". <]/Prev 210925>> 500 1K 2.5K 5K 10K 25K 50K 100K 10 20 30 40 50 Temperature (oC) Thermistor R/T Curves For Varying Room Temperature Resistances Resistance (thousands) Figure 1. 2 Sensor Type 1. trailer 6 0 obj <> endobj 0000145645 00000 n 0000054410 00000 n 0000003089 00000 n A 10K resistor will always restrict 10,000 ohms of an electrical current. Example: 44005 is a standard thermistor. They are manufactured from the oxides of transition metals and can operate over the range of -196°C to 1000°C. A 10K thermistor, however, will only restrict 10,000 ohms of a current at 25℃. 0000129088 00000 n 0000012452 00000 n Int. P/N 1600-10K Thermistor The enclosed negative temperature coefficient (NTC) thermistor, p/n 1600-10K, works by translating temperature into resistance, with resistance decreasing as temperature increases (hence the ‘negative coefficient’). 441is a Teflon encased thermistor with the same resistance values. The data from the tests shown below xref Thermistor Description Thermistor Overview BAPI Thermistors are thermally sensitive resistors known for exhibiting a large change in resistance with only a small change in temperature. 1) If the bands on the body of the resistor are red, red, black, orange and gold then the register value is 220 *10^3 and its tolerance is 5% that is 220 kΩ+- 5%. Resistance @ +25°C Ohms 10,000 10K3A1A Resistance tolerance from 0°C to +70°C °C 0.1 10K3A1B Resistance tolerance from 0°C to +70°C °C 0.2 10K3A1C Resistance tolerance from 0°C to +70°C °C 0.5 10K3A1D Resistance tolerance from 0°C to +70°C °C 1.0 Alpha Value @ … 0000002108 00000 n The major difference between the RTD and the Thermistor is that the RTD is made of metal, whereas the semiconductor material is used for Thermistor. 2)The register of value 470*10^6 Ω+- 20% will have the colour code yellow, violet, black, blue and 5th band will be absent. 0000129584 00000 n of Teflon encased thermistors add 100 to part No. 0 0000055164 00000 n negative B - 10K4A1 Sensor type: Thermistor, temp coef. It is important to note that a thermistor’s change in resistance is non-linear. startxref %%EOF The Thermistor and the RTD both are the temperatures measuring device. 0000013399 00000 n 0000050551 00000 n 0000001712 00000 n You can lookup other test values in the Temperature vs Resistance Conversion Chart for 10k Thermistors. 0000021168 00000 n 0000001890 00000 n 0000000016 00000 n It follows a pre-defined curve which is provided by the thermistor manufacturer. Thermistors are manufactured to follow a specific curve with a high degree of accuracy. Note: Only thermistors with ±0.2°C interchangeability are available encased in Teflon as standard parts. 0000013732 00000 n Thermistor temperature range … 0000019749 00000 n It should read 10,000 ohms at 77F (25C) degrees. 0000050185 00000 n Thermometrics, Inc. offers a wide range of NTC Thermistors from component-level to complete sensor assemblies. The other differences between the Thermistor and RTD are explained below in the comparison chart. 0000013597 00000 n Resistances of Thermistors Manufacturers R-W. If the temperature is warmer, let’s say 50℃, the thermistor would restrict only 3,900 ohms. The beta constant for the thermistor is 3380, the thermistor resistance (R0) at 25°C is 10K ohms, and the ADC returns a value 366. It is important to note that a thermistor’s change in resistance is non-linear. 0000069785 00000 n 44105 is a Teflon encased thermistor with the same resistance values. 10K-Thermistor Output Table 10K-Thermistor Output Table 10K-Thermistor Output Table. For Part No. Reprap Hotend Thermistor NTC 3950 100K with 1M Cable R---T TABLE R 25℃=100KΩ±1% B 25℃/50℃=3950±1% T Rmax Rnor Rmin T Rmax Rnor Rmin -30 1805.1971 1733.2000 1663.6657 10 203.3838 199.9900 196.6338 In the standard Steinhart-Hart equation the C parameter is set to zero. Resistance-Temperature response curves for nine common thermistors. NTC Thermistors are ideal for applications requiring a continuous change of resistance with temperature. Pentair Compool 0000103196 00000 n Selecting and Using Thermistors for Temperature Control Thermally sensitive resistors (thermistors) are Thermistor resistance is related to temperature in degrees Kelvin by the following formula: 1/T= A + B*ln(R/Rt) + C*ln(R/Rt) 2 + D*ln(R/Rt) 3. 0000024318 00000 n It follows a pre-defined curve which is provided by the thermistor manufacturer. Alternate Energy Technologies (AET) is America's largest manufacturer of flat-plate, solar thermal collectors.We provide turnkey commercial solar water heating solutions as well as pre-engineered residential systems. 0000055256 00000 n h�b``0f``]�������� 6 54 °C Rt/R25 TEMP. The thermistor temperature may be changed by the surrounding temperature or by self-heating the thermistor by passing a current through it. 0000129298 00000 n 0000037837 00000 n Fig 1. They do not amplify, rectify, polarize or generate a signal. 0000009399 00000 n Negative temperature coefficient (NTC) thermistors have a resistance which reduces as the temperature rises (fig 1.). 0000001376 00000 n ÃÔáSö!ı�Çò¤ÿGÕÂE­'â�ƒ�2@ƒ–²S—s.lƒPjı\û¡$¦ˆ×pÚ�+½�°=Ô�•Èâà†:Äè÷¼°A t{@܇5rO‰$$#�š ;ò(ğHKÄ"�Šp zIêA¸T‹q%{ÎȤè. 0000014216 00000 n An NTC thermistor is a thermally sensitive resistor whose resistance exhibits a large, precise and predictable decrease as the core temperature of the resistor increases over the operating temperature range. To test the device a 10K ohn resistor can be plugged in in-place of the thermistor cable and the device should read it as 77F (25C) degrees. Thermistors change resistance with a change in temperature. 44016 44116 10K 3891 29.26 150°C -80-+120°CB 44006 44106 10K 3574 23.51 150°C -80-+120°CH 44008 44108 30K 3810 29.15 150°C -80-+120°CH 44011 44111 100K 3988 34.82 150°C -80-+120°CH 44014 44114 300K 4276 46.02 150°C -80-+120°CH ... resistance in thermistor components. Resistors are great for use in electronics, for example, because of this stable characteristic. B-value (material constant) = 3950+- 1%. negative C - 20K6A1 Sensor type: Thermistor, temp Resistance at 25 degrees C: 10K +- 1%. It follows a pre-defined curve which is provided by the thermistor manufacturer. Solar Thermal Technology Leader. 0000024216 00000 n %PDF-1.4 %���� Thermistor Description Thermistor Overview BAPI Thermistors are thermally sensitive resistors known for exhibiting a large change in resistance with only a small change in temperature. thermistor’s change in resistance is non-linear. 0000096997 00000 n 0000069473 00000 n 0000054866 00000 n Temperature vs Resistance Conversion Chart for 10k Thermistors Temperature vs Resistance Conversion Chart for 10k Thermistors. Fax +44 (0) 1732 861226 Thermistor Types and Compatibility Chart. °C Rt/R25 TEMP. 3k 10kType 10kType 10kDale 10k3A210kG US 20k. Thermistor Resistance 0000069254 00000 n 0000006678 00000 n The B value for a particular NTC thermistor can be determined by measuring the resistance at T1 and T 2 and inserting these resistance values into the appropriate equation (formula 4). B values for common NTC materials range from 2000 through 5000 K. Figure 1 illustrates the de- However, some manufacturers use all 4 coefficients. As can be seen be the graph, the resistance of the thermistor drops very quickly. Temperature vs. Resistance Chart Thermistor @ 25°C Ohms °F °C Resistance 10K OPEN INFINITE 32 0 32,630 41 5 25,380 50 10 19,890 59 15 15,710 68 20 12,490 77 25 10,000 86 30 8,057 95 35 6,531 104 40 5,326 113 45 4,368 122 50 3,601 131 55 2,985 140 60 2,487 149 65 2,082 158 70 1,751 As can be seen be the graph, the resistance of the thermistor drops very quickly. 0000012671 00000 n 0000038103 00000 n 0000012932 00000 n 0000001635 00000 n 1/T = 1/298.15 + 1/3380 * ln ((1023 / 366) - 1) 1/T = 0.003527 T = 283.52K – 273.15K = 10.37°C SENSOR RESISTANCE CHART – PRECON THERMISTORS PRECON TYPE II PRECON TYPE III PRECON TYPE IV Model 21 Model 22 Model 24 Model 27 Model 3 Model 42 2252Ω @ 77°F 3000Ω @ 77°F 10,000Ω @ 77°F 100,000Ω @ 77°F 10,000Ω @ 77°F 20,000Ω @ 77°F ±0.36°F from ±0.36°F from ±0.36°F from ±0.36°F @ 77°F ±0.36°F from ±0.36°F from Dissipation factor (loss-rate of energy of a mode of oscillation) δ th = (in air)approx.7.5mW/K. 0000012802 00000 n 0000087918 00000 n They are used for resistance thermometers in temperature measurement and all Sterling Sensors assemblies are made using this type of thermistor. 0000022652 00000 n All resistors have some dependency on temperature, which is described by their temperature coefficient . In most cases for (fixed or variable) resistors the temperature coefficient is minimized, but in the case of thermistors a high coefficient is achieved. 7 - 10,000 ohm NTC thermistor (Type III) 10 - 3,000 ohm NTC thermistor 12- 10,000 ohm NTC thermistor (Type II) 13 - 5,000 ohm NTC thermistor 14 - 1,035 ohm Silicon PTC 15- 100,000 ohm NTC thermistor 16- 10,000 ohm NTC thermistor (Eliwell) 17- 20,000 ohm NTC thermistor 18- 2,252 ohm NTC thermistor 21 - 1,800 ohm NTC thermistor : Sensor Type (°C) Technical Specifications. All BAPI thermistors have a standard accuracy of ± 0.2 °C Characteristics of NTC thermistors 0000054654 00000 n 0000050464 00000 n Thermal cooling time constant <= (in air) 20 seconds. The sensor can be tested with a multimeter. Temperature is warmer, let ’ s say 50℃, the resistance of the thermistor.! Thermistor per degree Kelvin thermometers in temperature measurement and all Sterling Sensors assemblies are made using this of! 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