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NTC THERMISTORS: TYPE A990

sembly configurations may be available upon special order. Please consult factory for any special requests or modifications. Maximum Operating or Storage Temperature for Optimum Stability is 105°C.

NTC THERMISTORS: TYPE A990
DESCRIPTION:
Type A990 Interchangeable sub-assemblies consist of matched pairs of small, glass encapsulated thermistor beads which are connected in either series or parallel circuit configurations. These sub-assemblies are available in a variety of styles which will permit them to be used in measuring the temperature of liquids or solids or to be encapsulated into larger housings such as hypodermic needles or closed end sheaths. The sub-assemblies provide interchangeable resistance - temperature characteristics in extremely small, fast response packages which are easy to handle. The units shown are available from stock or with fast delivery. Resistance, tolerances and temperature ranges other than those which are indicated may be available upon special order. Other as-
sembly configurations may be available upon special order. Please consult factory for any special requests or modifications. Maximum Operating or Storage Temperature for Optimum Stability is 105°C.
CODING:
CURVE TOLERANCE CODE: (SEE TABLE A) RESISTANCE CODE: (SEE TABLE B) PREFIX (A990B-T)
A990M HYPODERMIC NEEDLE ASSEMBLY
A990T STAINLESS STEEL SHEATH WITH TREADED HUB
STILL AIR 15 SEC. STILL AIR D.C. .80 mW / K T.C.
WATER PLUNGE .250 SEC. STILL WATER 1.7mW / K
STILL AIR 16 SEC. STILL AIR D.C. .80 mW / K T.C.
WATER PLUNGE .300 SEC. STILL WATER 1.8mW / K
LONGER LEADS ARE AVAILABLE ON REQUEST
TABLE A: CURVE TOLERANCES
TABLE B: RESISTANCE VS. TEMPERATURE CHARACTERISTICS
Temperature (°C) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 UN 103 14129.9 11335.1 9152.8 7437.4 6080.3 5000.0 4134.9 3438.1 2873.8 2414.2 2038.0 1728.4 1472.6 1260.0 1082.7 934.02 808.93 703.23 613.55 537.18 471.90 415.90 UT 103 56519.5 45340.5 36611.2 29749.5 24321.1 20000.0 16539.7 13752.5 11495.1 9656.7 8151.9 6913.8 5890.2 5040.0 4330.6 3736.1 3235.7 2812.9 2454.2 2148.7 1887.6 1663.6 Resistance Code (Data in Ohms) UN 223 31452.1 25168.0 20273.6 16435.7 13406.3 11000.0 9077.0 7531.1 6281.4 5265.6 4435.6 3753.9 3191.3 2724.8 2336.2 2011.1 1738.0 1507.6 1312.4 1146.5 1004.9 883.67 UT 223 125808 100672 81094.6 65742.7 53625.1 44000.0 36307.9 30124.5 25125.7 21062.5 17742.3 15015.5 12765.2 10899.2 9344.9 8044.5 6952.0 6030.3 5249.6 4586.0 4019.6 3534.7 UN 443 64394.4 51167.4 40931.5 32956.3 26701.3 21764.2 17843.2 14710.6 12193.5 10159.7 8507.6 7154.4 6043.0 5126.1 4366.4 3734.4 3206.5 2763.7 2390.8 2075.7 1808.5 1580.9 UT 443 257577.5 204669.5 163726.2 131825.2 106805.3 87056.8 71372.8 58842.5 48774.1 40638.8 34030.3 28617.7 24171.9 20504.4 17465.8 14937.8 12825.9 11054.7 9563.4 8303.0 7233.9 6323.7
APPLICATIONS:
A990B A990C A990D A990E A990M For insertion into metal housing or close tolerance openings. Fully immersible sub-assembly for use in conductive fluids. Limited depth immersion or surface contact. Fully immersible sub-assembly with additional mechanical strain relief. Sub-assembly encapsulated into sharpened hypodermic needle with 3 foot extension leads of #28 GA PVC wire. For various laboratory temperature measurements. Standard sub-assembly encapsulated into vinyl catheter tubing with #28 GA PVC wire extension leads. Sub-assembly encapsulated into closed end stainless steel sheath with threaded hub. For various commercial applications or severe environments.
A990P A990T -