Sensor Scientific KWM Series interchangeable wafer thermistors
combine a high-accuracy thermistor with a tough insulated
lead. The Kynar lead insulation offers many of the advantages of
Teflon insulation with a lower cost. Interchangeability eliminates
the burden of individual calibration. Units are available in
resistance values from 2k ohms to 100k ohms @ 25°C. The
available resistance vs. temperature curves (SSi curves C,
D, E & Y) are industry-standard. If a standard unit does not
meet your needs, customized tolerances, resistance values,
temperature ranges, and termination options are available.
Design assistance is also available.
EPOXY COAT 28AWG (.0126", 0.32mm diameter)
KYNAR-INSULATED LEADS
.25 NOM.
(6.3mm)
STRIP
3.5 ±.25
(89 ±6.3mm)
.090 MAX.
(2.3mm)
Part Number
Resistance ±0.2 Deg ±0.5 Deg ±1.0 Deg C R. vs. Temp.
@ 25 Deg C tolerance tolerance tolerance Curve
ohms
2000 KWM202C KWN202C KWP202C C
2252 KWM222C KWN222C KWP222C C
3000 KWM302C KWN302C KWP302C C
4000 KWM402C KWN402C KWP402C C
5000 KWM502C KWN502C KWP502C C
10000 KWM103C KWN103C KWP103C C
10000 KWM103Y KWN103Y KWP103Y Y
30000 KWM303D KWN303D KWP303D D
30000 KWM303E KWN303E KWP303E E
50000 KWM503D KWN503D KWP503D D
100000 KWM104D KWN104D KWP104D D
KWM Series Interchangeable
Wafer Thermistors with
Kynar-Insulated Leads
— Dissipation Constant: 1.5 mW/°C Typ. in still air —
— Time Constant: 10 sec. Typ. in still air —
Call us toll-free at 800-524-1610 (in the US) — or check us out on the web at www.sensorsci.com
Sensor Scientific, Inc. • 6 Kings Bridge Road - Fairfield, New Jersey 07004 • Phone: (973) 227-7790 • Fax: (973) 227-8063
eMail: sales@sensorsci.com • web: www.sensorsci.com
FEATURES:
• TOUGH KYNAR (PVDF) LEAD INSULATION
• SILVER-PLATED COPPER CONDUCTOR RESISTS OXIDATION
• HIGH ACCURACY
• HIGH STABILITY
• INTERCHANGEABLE FROM 0 DEG C TO 70 DEG C
OPTIONS:
• LONGER OR SHORTER LEAD LENGTHS
• TERMINATION TYPE
• NON-STANDARD TOLERANCES
• VALUE ADDED CUSTOM PROBE ASSEMBLIES
SPECIFICATIONS:
• THERMAL TIME CONSTANT: 10 SECONDS TYP. IN STILL AIR
• DISSIPATION CONSTANT: 1.5 mW/°C
• MAXIMUM OPERATING TEMPERATURE: 125°C (INTERCHANGEABILITY
MAY DEGRADE IF USED ABOVE 70 DEG. C.)
• INTERCHANGEABILITY RANGE: 0 TO 70 DEG. C.
“The information contained herein is believed to be accurate. The user, however, should verify the suitability of a particular procuct for a specific application. Senor Scientific,
Inc. does not warrant the accuracy of this information, and disclaims any liability with respect to its use.”
Resistance Multiplier and Alpha Values for KWM Series Interchangeable Wafer Thermistors with Kynar-Insulated Leads
Sensor Scientific, Inc.
Temp ºF Temp ºC Multiplier Alpha Multiplier Alpha Multiplier Alpha Multiplier Alpha
-40.0 -40.0 33.61 -6.7 40.64 -6.9 29.48 -6.3 23.98 -5.9
-31.0 -35.0 24.24 -6.4 28.89 -6.7 21.63 -6.1 17.93 -5.7
-22.0 -30.0 17.68 -6.2 20.76 -6.5 16.02 -5.9 13.52 -5.6
-13.0 -25.0 13.03 -6.0 15.08 -6.3 11.98 -5.7 10.29 -5.4
-4.0 -20.0 9.701 -5.8 11.06 -6.1 9.033 -5.6 7.893 -5.2
5.0 -15.0 7.291 -5.6 8.193 -5.9 6.869 -5.4 6.103 -5.1
14.0 -10.0 5.530 -5.4 6.123 -5.7 5.266 -5.2 4.755 -4.9
23.0 -5.0 4.232 -5.3 4.617 -5.6 4.068 -5.1 3.732 -4.8
32.0 0.0 3.265 -5.1 3.510 -5.4 3.166 -4.9 2.949 -4.6
41.0 5.0 2.539 -5.0 2.690 -5.2 2.481 -4.8 2.346 -4.5
50.0 10.0 1.990 -4.8 2.078 -5.1 1.958 -4.7 1.879 -4.4
59.0 15.0 1.571 -4.7 1.617 -4.9 1.556 -4.5 1.514 -4.3
68.0 20.0 1.249 -4.5 1.267 -4.8 1.243 -4.4 1.227 -4.1
77.0 25.0 1.000 -4.4 1.000 -4.7 1.000 -4.3 1.000 -4.0
86.0 30.0 0.8056 -4.3 0.7943 -4.5 0.8089 -4.2 0.8196 -3.9
95.0 35.0 0.6530 -4.1 0.6349 -4.4 0.6580 -4.1 0.6754 -3.8
104.0 40.0 0.5325 -4.0 0.5106 -4.3 0.5382 -4.0 0.5594 -3.7
113.0 45.0 0.4367 -3.9 0.4130 -4.2 0.4425 -3.9 0.4656 -3.6
122.0 50.0 0.3601 -3.8 0.3360 -4.1 0.3656 -3.8 0.3893 -3.5
131.0 55.0 0.2985 -3.7 0.2748 -4.0 0.3036 -3.7 0.3271 -3.4
140.0 60.0 0.2487 -3.6 0.2259 -3.9 0.2533 -3.6 0.2760 -3.4
149.0 65.0 0.2082 -3.5 0.1867 -3.8 0.2122 -3.5 0.2339 -3.3
158.0 70.0 0.1752 -3.4 0.1550 -3.7 0.1786 -3.4 0.1990 -3.2
167.0 75.0 0.1480 -3.3 0.1293 -3.6 0.1510 -3.3 0.1700 -3.1
176.0 80.0 0.1256 -3.2 0.1084 -3.5 0.1281 -3.2 0.1458 -3.0
185.0 85.0 0.1070 -3.2 0.0912 -3.4 0.1092 -3.2 0.1255 -3.0
194.0 90.0 0.0916 -3.1 0.0771 -3.3 0.0934 -3.1 0.1084 -2.9
203.0 95.0 0.0787 -3.0 0.0654 -3.2 0.0801 -3.0 0.0940 -2.8
212.0 100.0 0.0678 -2.9 0.0558 -3.2 0.0690 -2.9 0.0817 -2.8
221.0 105.0 0.0587 -2.9 0.0477 -3.1 0.0597 -2.9 0.0713 -2.7
230.0 110.0 0.0510 -2.8 0.0409 -3.0 0.0517 -2.8 0.0624 -2.6
239.0 115.0 0.0444 -2.7 0.0353 -2.9 0.0450 -2.8 0.0548 -2.6
248.0 120.0 0.0388 -2.7 0.0305 -2.9 0.0393 -2.7 0.0482 -2.5
257.0 125.0 0.0341 -2.6 0.0264 -2.8 0.0344 -2.6 0.0426 -2.5
266.0 130.0 0.0300 -2.5 0.0230 -2.8 0.0302 -2.6 0.0377 -2.4
275.0 135.0 0.0264 -2.5 0.0201 -2.7 0.0266 -2.5 0.0335 -2.4
284.0 140.0 0.0234 -2.4 0.0176 -2.6 0.0235 -2.5 0.0298 -2.3
293.0 145.0 0.0207 -2.4 0.0154 -2.6 0.0208 -2.4 0.0266 -2.3
302.0 150.0 0.0185 -2.3 0.0136 -2.5 0.0184 -2.4 0.0238 -2.2
Material Curve C D E Y
Available Resistance 1,000 to 25,000 10,000 to 100,000 1,000 to 50,000 1,000 to 10,000
Range at 25ºC in ohms
Alpha at 25ºC 4.39% -4.67% -4.30% -4.03%
