NTC Type A990 Series Thermometrics Thermistors Applications Type A990B For insertion into metal housing or close tolerance openings Type A990C Fully immersible sub-assembly for use in conductive fluids. Type A990D Limited depth immersion or surface contact , for use in measuring the temperature of liquids or solids. Type A990E Fully immersible sub-assembly with additional mechanical strain relief, for use in metal housings for liquid immersion or close tolerance openings. Type A990M Sub-assembly encapsulated into sharpened hypodermic needle with 3 ft (1 m) extension leads of #28 GA PVC wire. For use in various laboratory temperature measurements. Type A990P Standard sub-assembly encapsulated into vinyl catheter tubing with #28 GA PVC wire extension leads, for use in various commercial applications. Amphenol Advanced Sensors Type A990T Sub-assembly encapsulated into closed end stainless steel sheath with threaded hub. For use in various commercial applications or severe environments. The NTC 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 enable 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 and/or with fast delivery. Resistance, tolerances and temperature ranges, other than those which are indicated, may be available upon special order. Other assembly configurations may be available upon special order. Please consult the factory for any special requests or modifications. Maximum Operating or Storage Temperature for Optimum Stability is 221°F (105°C). NTC Type A990 Specifications Curve Tolerances Temperature Tolerance in °C Tolerance Code 0°C to 25°C 25°C to 50°C 50°C to 70°C 70°C to 105°C Sx1 ±0.1 ±0.05 ±0.1 ±0.2 Sx2 ±0.1 ±0.1 ±0.1 ±0.2 Sx3 ±0.2 ±0.1 ±0.2 ±0.3 Sx4 ±0.2 ±0.2 ±0.2 ±0.3 Resistance vs. Temperature Characteristics Temperature (°C) Resistance Code (Data in Ω) UN 103 UT 103 UN 223 UT 223 UN 443 UT 443 0 14129.9 56519.5 31452.1 125808 64394.4 257577.5 5 11335.1 45340.5 25168.0 100672 51167.4 204669.5 10 9152.8 36611.2 20273.6 81094.6 40931.5 163726.2 15 7437.4 29749.5 16435.7 65742.7 32956.3 131825.2 20 6080.3 24321.1 13406.3 53625.1 26701.3 106805.3 25 5000.0 20000.0 11000.0 44000.0 21764.2 87056.8 30 4134.9 16539.7 9077.0 36307.9 17843.2 71372.8 35 3438.1 13752.5 7531.1 30124.5 14710.6 58842.5 40 2873.8 11495.1 6281.4 25125.7 12193.5 48774.1 45 2414.2 9656.7 5265.6 21062.5 10159.7 40638.8 50 2038.0 8151.9 4435.6 17742.3 8507.6 34030.3 55 1728.4 6913.8 3753.9 15015.5 7154.4 28617.7 60 1472.6 5890.2 3191.3 12765.2 6043.0 24171.9 65 1260.0 5040.0 2724.8 10899.2 5126.1 20504.4 70 1082.7 4330.6 2336.2 9344.9 4366.4 17465.8 75 934.02 3736.1 2011.1 8044.5 3734.4 14937.8 80 808.93 3235.7 1738.0 6952.0 3206.5 12825.9 85 703.23 2812.9 1507.6 6030.3 2763.7 11054.7 90 613.55 2454.2 1312.4 5249.6 2390.8 9563.4 95 537.18 2148.7 1146.5 4586.0 2075.7 8303.0 100 471.90 1887.6 1004.9 4019.6 1808.5 7233.9 105 415.90 1663.6 883.67 3534.7 1580.9 6323.7 NTC Type A990 dimensions Ordering Information The code number to be ordered may be specified as follows: A990x (x = B, C, D, E, M, P or T) Code Resistance Code X See resistance code table Code X table A990 - ___ - ___ Amphenol Advanced Sensors - ___ Curve Tolerance See curve tolerance - Typical model number www.amphenol-sensors.com © 2014 Amphenol Corporation. All Rights Reserved. Specifications are subject to change without notice. Other company names and product names used in this document are the registered trademarks or trademarks of their respective owners. AAS-920-278A - 05/2014