A-A-55512 Resistor, Thermally Sensitive \(Thermistor\)This \(CID\) covers the general requirements for a thermistor. This thermistor is a stainless steel probe with a flange, for air \(open ended\) and liquid \(sealed ended\) measurements. These parts come with insulated leads in four different lengths. Thermistors covered by this CID are intended for commercial/industrial applications and are not used in military systems needing stringent environmental and electrical requirements.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7

A-A-55512B

TABLE I. Minimum/maximum resistance value and curve.

Resistance (ohms)

Resistance temperature

at +25�C

curve

40 to 250

470 to 2.2 k

1.7 k to 33 k

33 k to 100 k

47 k to 150 k

47 k to 220 k

470 k to 1.2 M

3.1 M to 40 M

3.5 Resistance at temperatures other than 25�C. Resistance of temperatures other than +25�C shall be

as specified in table II.

3.6 Resistance tolerance. The thermistor specified herein is available in resistance tolerances F

(�1 percent), G (�2 percent), J (�5 percent), and K (�10 percent) plus the resistance deviation at specified

temperature as specified in table II.

3.7 Lead length. The leads shall be number 28 gauge AWG, black polyvinylchloride (PVC), insulated

wire and are available in 4 inch (10.16 cm), 6 inch (15.24 cm), 12 inch (30.48 cm), or 24 inch (60.96 cm)

lengths.

3.8 Resistance temperature coefficient. The resistance temperature coefficient shall be as specified in

3.9 Operating temperature. The operating temperature shall be -10�C to +95�C.

Inches

0.25

0.010

15.75

0.62

0.51

0.02

25.4

1.0

2.54

0.10

50.8

2.0

3.05

0.12

75.12

2.957

4.75

0.19

100.16

3.9433

FIGURE 1. Resistor, thermally sensitive (thermistor probe).