Thermometrics Thermistors

NTC Type A990 Series

Type A990T

Sub-assembly encapsulated into closed end stainless

steel sheath with threaded hub. For use in various com-

mercial 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 resis-

tance-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 configu-

rations may be available upon special order. Please

consult the factory for any special requests or modifi-

cations.

Maximum Operating or Storage Temperature for

Optimum Stability is 221°F (105°C).

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 me-

chanical strain relief, for use in metal housings for liquid

immersion or close tolerance openings.

Type A990M

Sub-assembly encapsulated into sharpened hypoder-

mic 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 cath-

eter tubing with #28 GA PVC wire extension leads, for

use in various commercial applications.

Amphenol

Advanced Sensors