Building Automation Products, Inc. • 750 North Royal Avenue, Gays Mills, WI 54631 USA
Tel: +1-608-735-4800 • Fax: +1-608-735-4804 • Email: [email protected] • Web: www.bapihvac.com
H14
BAPI Sensor Specifi cations
100K Thermistor Output Table
°F °C Ohms
°F °C Ohms
°F °C Ohms
-39 -39.44 3916295
-37 -38.33 3627711
-35 -37.22 3362274
-33 -36.11 3117987
-31 -35.00 2893035
-29 -33.89 2685770
-27 -32.78 2494694
-25 -31.67 2318444
-23 -30.56 2155781
-21 -29.44 2004274
-19 -28.33 1865595
-17 -27.22 1737397
-15 -26.11 1618827
-13 -25.00 1509102
-11 -23.89 1407512
-9 -22.78 1313405
-7 -21.67 1226184
-5 -20.56 1145306
-3 -19.44 1069620
-1 -18.33 1000019
1 -17.22 935383
3 -16.11 875329
5 -15.00 819505
7 -13.89 767589
9 -12.78 719284
11 -11.67 674319
13 -10.56 632442
15 -9.44 593086
17 -8.33 556739
19 -7.22 522842
21 -6.11 491217
23 -5.00 461699
25 -3.89 434134
27 -2.78 408383
29 -1.67 384316
31 -0.56 361813
33 0.56 340581
35 1.67 320895
37 2.78 302466
39 3.89 285206
41 5.00 269035
43 6.11 253877
45 7.22 239664
47 8.33 226331
49 9.44 213819
51 10.56 201971
53 11.67 190946
55 12.78 180588
57 13.89 170853
59 15.00 161700
61 16.11 153092
63 17.22 144992
65 18.33 137367
67 19.44 130189
69 20.56 123368
71 21.67 117000
73 22.78 110998
75 23.89 105338
77 25.00 100000
79 26.11 94963
81 27.22 90208
83 28.33 85719
85 29.44 81479
87 30.56 77438
89 31.67 73654
91 32.78 70076
93 33.89 66692
95 35.00 63491
97 36.11 60461
99 37.22 57594
101 38.33 54878
103 39.44 52306
105 40.56 49847
107 41.67 47538
109 42.78 45349
111 43.89 43273
113 45.00 41303
115 46.11 39434
117 47.22 37660
119 48.33 35976
121 49.44 34376
123 50.56 32843
125 51.67 31399
127 52.78 30027
129 53.89 28722
131 55.00 27481
133 56.11 26300
135 57.22 25177
137 58.33 24107
139 59.44 23089
141 60.56 22111
143 61.67 21188
145 62.78 20308
147 63.89 19469
149 65.00 18670
151 66.11 17907
153 67.22 17180
155 68.33 16486
157 69.44 15824
159 70.56 15187
161 71.67 14584
163 72.78 14008
165 73.89 13458
167 75.00 12932
169 76.11 12430
171 77.22 11949
173 78.33 11490
175 79.44 11051
177 80.56 10627
179 81.67 10225
181 82.78 9841
183 83.89 9473
185 85.00 9121
187 86.11 8783
100K Thermistor Output Table
Rev. 10/16/12
H2
BAPI Sensor Specications
Building Automation Products, Inc. • 750 North Royal Avenue, Gays Mills, WI 54631 USA
Tel: +1-608-735-4800 • Fax: +1-608-735-4804 • Email: [email protected] • Web: www.bapihvac.com
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. It is important to note that a
thermistor’s change in resistance is non-linear.
It follows a pre-dened curve which is provided
by the thermistor manufacturer. An example of a
thermistor output curve can be seen in Figure 1.
Thermistors are manufactured to follow a specic
curve with a high degree of accuracy. All BAPI
thermistors have a standard accuracy of ± 0.2 °C
throughout the commercial temperature range of
0 to 70 °C. BAPI also has available a higher accuracy sensor for meeting tougher specs. The extra
precision [XP] line has an initial accuracy of ± 0.1 °C throughout the commercial temperature range
of 0 to 70 °C. Please call for availability and pricing on [XP] line thermistors. Both accuracy levels
allow BAPI thermistors to be interchanged without the extra expense of osetting the controller.
Thermistor Specications
DEFINITION OF SPECIFICATION TERMS
Interchangeability Tolerance (Accuracy):
The maximum amount that thermistors following
the same curve will dier from each other.
Dissipation Constant:
The power needed to raise the thermistor’s
body temperature by 1°C. At the heart of all
BAPI thermistor products is a sensor with a 2.7
mW/°C dissipation constant to ensure that self-
heating stays at an absolute minimum.
Stability (drift):
The amount that the resistance characteristics
of a thermistor will change. BAPI uses only the
highest quality, “pre-aged” thermistors with very
small drift values. Over a ten year span, BAPI
thermistors will not change more than 0.1°C.
Operating Range:
The operating range shown is for the thermis-
tor only. The mounting package may further
limit the operating range and is described on
each mounting type specication. The thermal
time constant will also be aected based on the
added mass of the stainless steel probe and
moisture protection encapsulation.
Thermal Time Constant
Bare sensors are typically measured and specied
in still air and are timed at the statistical 63.2% of
the step temperature change. A stirred liquid test
will typically result in a much faster response time
and is also timed at 63.2% of the step temperature
change. The time constant is always the same
whatever the temperature step change may be.
Thermistor Specications
Interchangeability Tolerance (Accuracy):
Standard Sensor: ± 0.2 °C (0 to 70 °C)
High Accuracy [XP] Sensor: ± 0.1 °C (0 to 70 °C)
Dissipation Constant: 2.7 mW/°C
Stability (drift): Less than 0.02 °C / year
Thermal Time Constant: 5 seconds (bead in still air)
.5 seconds (stirred liquid)
Sensor Reference Operating
Type Resistance Range
1.8K 1.8 KΩ @ 25 °C -55 to 150 °C
2.2K 2.2 KΩ @ 25 °C -55 to 150 °C
3K** 3 KΩ @ 25 °C -55 to 150 °C
3.3K 3.3 KΩ @ 25 °C -55 to 150 °C
10K-2** 10 KΩ @ 25 °C -55 to 150 °C
10K-3** 10 KΩ @ 25 °C -55 to 150 °C
10K-3(11K)** 5.2 KΩ @ 25 °C -55 to 150 °C
10K-4 10 KΩ @ 25 °C -55 to 150 °C
20K** 20 KΩ @ 25 °C -55 to 150 °C
47K 47 KΩ @ 25 °C -55 to 150 °C
50K 50 KΩ @ 25 °C -80 to 150 °C
100K** 100 KΩ @ 25 °C -55 to 150 °C
Other Thermistors are available. Contact BAPI for
availability and specications of additional thermistors.
**Available as an [XP] high accuracy sensor.
Minimum quantities and long lead times may apply.
10K-2[XP] and 10K-3[XP] thermistors are typically
stocked items
* All Passive Thermistors 10K Ω and smaller are CE compliant.
*
Rev. 05/07/21
