TR104 SERIES 50KOhm@25°C THERMISTOR SPECIFICATIONS
 
 General Information
 Interchangeability Tolerance and Accuracy
 Steinhart-Hart Equation Coefficients
 Resistance vs Temperature (R-T) Table and Data Download
  General Information

Thermistor is a generic term describing a semiconductor device that exhibits an electrical conductivity that is highly sensitive to temperature. The name was derived from the words, "thermally sensitive resistor". These devices may be either positive temperature coefficient (PTC) or negative temperature coefficient (NTC) with respect to their resistance characteristics with temperature.

Our thermistor sensors have an NTC type resistance versus temperature characteristic. In addition, they have a matched resistance versus temperature curve and are interchangeable from one thermistor to another per the specified tolerance.

The tolerance used for our thermistors is typical in the industry and represents the best compromise between price and what is achievable with good manufacturing practices. Improved interchangeability can be provided at a higher cost. Sensors could also be sorted using third party calibration laboratories, or your own in-house calibrator, to ensure greater accuracy for each sensor installation (controller/sensor combination). Calibration is also useful when two sensors are attached to the same controller, since sensors that match can be selected. Regardless, the tolerances shown are the extreme, as required for engineering calculations. Most sensors are well within the Interchangeability Tolerance shown below.

Our temperature controllers are designed for "end point stability." Generally, for any given set point, control can be matched from controller to controller by making minor adjustments to the set point. With our PC compatible controllers, there is usually an Input Offset feature that can be used to make minor adjustments to the temperature being reported by the sensor.

Base Resistance at 25°C is 50,000 Ohms.

 
 

Interchangeability Tolerance and Accuracy

Note that the tolerance specifications of the sensor do not affect end point temperature control and temperature stability. They affect the accuracy of the temperature being "reported" by the sensor when using a PC compatible temperature controller, or a temperature controller with a front panel display. Our controllers are designed for excellent end point temperature control, but they are not meant to be calibration grade instruments (which are far more expensive). To improve the accuracy of the temperature reported by any of the sensors listed below, calibrate the sensor/controller combination to an in-house or third party standard. If you have a question about the thermistor tolerance specifications as related to your requirements, or about calibration, please  . There are many calibration techniques and tools.
 

Interchangeability Tolerance and Accuracy:

 

 
Steinhart-Hart Equation Coefficients

 

The Steinhart-Hart polynomial is 1/T = A1 + A2(ln(R)) ... + AN(ln(R))N and this formula is generally reduced to the formula shown below. 

1/T = A + B(ln(R)) + C(ln(R))3

"T" is the temperature and "R" is the resistance and the coefficients are A, B and C.

The following TR104 series thermistor coefficients are suitable for the Steinhart-Hart equation.

A: 7.6647E-04
B: 2.3051E-04
C: 7.3815E-08

 
 
50K
TR104 SERIES THERMISTORS (RoHS Compliant)
TS104 SERIES THERMISTORS (not RoHS Compliant)

50KOhm@25°C | 50000 Ohms@25°C | Based on FENWALL CURVE 16 | Similar to "J" Curve
Downloadable as CSV text file (right-click to download): TR104ResTemp.csv
TEMPERATURE vs RESISTANCE TABLE
°C Ohms °C Ohms °C Ohms °C Ohms °C Ohms
0 163300 31 38610 62 11580 93 4182 124 1753
1 155200 32 37020 63 11170 94 4057 125 1708
2 147500 33 35490 64 10790 95 3937 126 1664
3 140300 34 34040 65 10410 96 3821 127 1622
4 133400 35 32660 66 10060 97 3709 128 1581
5 127000 36 31340 67 9710 98 3601 129 1541
6 120900 37 30080 68 9380 99 3497 130 1503
7 115100 38 28880 69 9065 100 3396 131 1465
8 109600 39 27730 70 8755 101 3298 132 1429
9 104400 40 26630 71 8465 102 3204 133 1394
10 99500 41 25590 72 8185 103 3113 134 1360
11 94850 42 24590 73 7910 104 3025 135 1326
12 90450 43 23630 74 7650 105 2940 136 1294
13 86300 44 22720 75 7400 106 2857 137 1263
14 82300 45 21840 76 7160 107 2778 138 1232
15 78550 46 21010 77 6925 108 2701 139 1203
16 75000 47 20210 78 6705 109 2626 140 1174
17 71600 48 19440 79 6490 110 2554 141 1146
18 68400 49 18710 80 6280 111 2484 142 1119
19 65350 50 18010 81 6080 112 2416 143 1092
20 62450 51 17340 82 5890 113 2351 144 1067
21 59700 52 16700 83 5705 114 2287 145 1042
22 57100 53 16080 84 5525 115 2226 146 1018
23 54600 54 15490 85 5355 116 2167 147 994
24 52250 55 14930 86 5190 117 2109 148 971
25 50000 56 14390 87 5030 118 2053 149 949
26 47870 57 13870 88 4875 119 1999 150 927
27 45830 58 13370 89 4726 120 1947
28 43890 59 12900 90 4582 121 1896
29 42040 60 12400 91 4444 122 1847
30 40290 61 12000 92 4310 123 1799