AAS 920 254B Thermometrics NTC AB6 040414

NTC Type AB6
Thermometrics
Thermobeads and
GCs (Chip-in-Glass)
Description
Applications
NTC Type AB6 thermistor assemblies consist of small
GC (chip-in-glass) or Thermobeads that are welded to
insulated extension leads. The Thermobeads or GC
(chip-in-glass) are hermetically sealed in glass and
have fine diameter 0.0007 in to 0.004 in (0.01778 mm
to 0.1016 mm) platinum alloy leads. The platinum leads
are cut short and welded to insulated extension leads
and the joints are covered in one of several insulation
types, depending upon the application or environment.
The assembly is then ready for insertion into
hypodermic needles, catheters or other small housings
that require extended leads. Any of the Thermobeads
or GC (chip-in-glass) listed in Table I may be used in
a NTC Type AB6 assembly. Please consult the data
shown for specific electrical or mechanical properties
for the thermistor selected.
Thermobead and GC (chip-in-glass) assemblies are
used where the small thermistor must be further
connected to longer leads, for insertion into deep
wells and cavities, or threading into long tubes. They
may also be used, as is, for applications that require
fast response measure-ments in confined spaces.
With these assemblies, the fast response of the small
thermistor is available without sacrificing ease of
insertion. The added leads and insulation allow the
minute assemblies to be handled in further assembly
operations, such as insertion into catheter lumens.
The same electrical characteristics that apply to the
selected thermistor (resistance value, resistance ratio,
stability) are unaltered in the assembly.
Amphenol
Advanced Sensors
NTC Type AB6
Specifications
Type A Insulation
AB6A8
Thermistor is welded to 38 gauge, nickel alloy 200,
bifilar heavy ISONEL insulated extension leads, 6.5 ft
(1.98 m) ±0.5 ft (±0.15 m) long. Liquid epoxy resin web
over weld joints provides some strain relief.
For insertion into plastic tubing or other insulators.
Maximum continuous operating temperature is 221°F
(105ºC).
0.13 in (3.2 mm) reference
Type C Insulation
AB6C8
Thermistor bead is welded to 38 gauge, nickel alloy
200, bifilar, heavy ISONEL insulated extension leads, 6.5
ft (1.98 m) ±0.5 ft (±0.15 m) long. Multiple conformal
dipcoats of liquid epoxy resin are applied for complete
insulation when immersed in fluids.
For use where fastest response times are required and
assembly will be fully immersed in conductive fluids.
Maximum continuous operating temperature is 221°F
(105°C).
0.25 in (6.4 mm) reference
72 in (1830 mm) minimum
D
72 in (1830 mm) minimum
Type D Insulation
D
Type B Insulation
AB6B2
Thermistors welded to 38 gauge, nickel alloy 200,
bifilar, heavy ISONEL insulated extension leads, 6.5
ft (1.98 m) ±1/2 ft (±0.15 m) long. Polyimide sleeve is
epoxied over weld joints and thermistor, for strain relief
and insulation.
For insertion into metal housings or tubings. Bead
covered for maximum strain relief and protection.
Maximum continuous operating temperature is 347°F
(175ºC).
0.13 in (3.2 mm) reference
AB6D2
Thermistor is welded to 38 gauge, nickel alloy 200,
bifilar, heavy ISONEL insulated extension leads, 6.5
ft (1.98 m) ±0.5 ft (±0.15 m) long. Small web of epoxy
is painted over weld joints for electrical isolation and
strain relief, and a heat sealed mylar sheath covers the
bead.
For fast response times, limited depth of immersion,
and best long term immersion qualities. Maximum
continuous operating temperature is 257°F (125°C).
1.5 in (38 mm) reference
72 in (1830 mm) minimum
D
72 in (1830 mm) minimum
D
Type E Insulation
AB6B4
Thermistor is welded to 38 gauge, nickel alloy 200,
bifilar, heavy ISONEL insulated extension leads, 6.5
ft (1.98 m) ±0.5 ft (±0.15 m) long. Polyimide sleeve is
epoxied over weld joints and up to back of thermistor
bead, for strain relief and electrical insulation.
AB6E3
Thermistor is welded to 38 gauge, nickel alloy 200,
bifilar, heavy ISONEL insulated extension leads 6.5
ft (1.98 m) ±0.5 ft (±0.15 m) long. Polyimide sleeve
is epoxied over welds for strain relief and electrical
insulation, multiple conformal dip coatings of liquid
epoxy resin are applied for complete immersibility in
conductive fluids.
For insertion into metal housings or tubings with close
tolerances. Bead is exposed as much as possible
for faster response. Maximum continuous operating
temperature is 221°F (105ºC).
0.13 in (3.2 mm) reference
For use in applications where fast response, good
strain relief and full immersion are required. Maximum
continuous operating temperature is 221°F (105ºC).
72 in (1830 mm) minimum
0.25 in (6.4 mm) reference
0.13 in (3.2 mm) reference
D
D
72 in (1830 mm) minimum
AB6E5
Thermistor is welded to 38 gauge, nickel alloy 200,
bifilar, heavy ISONEL insulated extension leads, 6.5
ft (1.98 m) ±0.5 ft (±0.15 m) long. Polyimide sleeve is
epoxied over bead and weld joints for strain relief and
insulation. Liquid epoxy resin conformal dipcoats are
applied for moisture sealing.
For use where assembly will be subjected to limited
fluid immersions and where maximum strain relief
is also required with minimum outside diameter.
Maximum continuous operating temperature is 221°F
(105°C).
0.13 in (3.2 mm) reference
72 in (1830 mm) minimum
D
AB6E8
Thermistor is welded to 38 gauge, nickel alloy 200,
bifilar, heavy ISONEL insulated extension leads 6.5 ft
(1.98 m) ±0.5 ft (±0.15 m) long. Polyimide sleeve is epoxied
over welds and thermistor for strain relief and electrical
insulation. Multiple conformal dip coatings of liquid epoxy
resin are applied for complete immersibility in conductive
fluids.
For use in applications where superior strain relief
and full immersion are required. Maximum continuous
operating temperature is 221°F (105°C).
0.25 in (6.4 mm) reference
72 in (1830 mm) minimum
Special Coding
The assembly types shown represent the most
standard selections of the many combinations
of thermistors and materials that Thermometrics
manufactures. These selected types are suitable for
many applications; however, there are always special
requirements that need to be satisfied for some
applications. A partial listing of alternate materials and
options is given on the next page to assist the designer
for applications in which the standard units shown are
not suitable. If assistance is required in the selection
of materials or design of the assembly, please contact
our applications engineering department and detail the
exact requirements or specifications desired.
Alternate Materials Selection
The alternate materials listed are available for NTC
Type AB6 thermistor assembly orders. Other materials
may be available to the designer or user upon special
order. Please allow additional time for the completion
of special assembly orders.
Type A Insulations
A web of insulating material is put over the weld joints
for strain relief. Available insulating materials with
maximum temperature ratings;
• Vinyl: 140°F (60°C)
• Polyurethane: 221°F (105°C)
• Silicone rubber: 500°F (260°C)
• Epoxies: from 221°F to 500°F (105°C to 260°C),
specify maximum temperature required.
0.13 in (3.2 mm) reference
D
Coding
1. Select the appropriate thermistor bead or small
probe from one of the thermistor types shown
in Table 1. Refer to the appropriate datasheet
for electrical and mechanical properties of
the thermistor selected and specific ordering
information for that thermistor.
2. Select one of the assembly types shown and use the
assembly prefix listed for that type followed by the
thermistor part number. Example: AB6A8BR16KA103N
This assembly uses a 0.016 in (0.40 mm) nominal
diameter, ruggedized Thermobead (Refer to NTC
Type BR Series datasheet) with adjacent cut leads, 10
kW ±25% at 77°F (25°C) nominal resistance, welded
to standard 6.5 (1.98 m) ±0.5 ft (±0.15 m) long, 38
gauge, nickel alloy 200, bifilar, heavy ISONEL insulated
extension leads with epoxy resin web between the
welded joints for strain relief.
Type B Insulations
A polyimide sleeve is epoxied over the weld joints for
improved strain relief and electrical insulation. The
bead may be covered for maximum strain relief or
exposed for faster response. Epoxies are generally
used to fill the polyimide sleeve and have temperature
ratings from 221°F to 500°F (105°C to 260°C).
Type C Insulations
Multiple conformal dip coats over the thermistor and
welds are used in order to provide fully immersible
assemblies. Any of the Type A insulating materials may
be used for the conformal dip coatings depending
upon the application or environment.
Type D Insulations
A thermoplastic tubing is heat sealed over the bead or
probe thermistor. A small amount of insulating material
is applied over the weld joints for electrical isolation.
The assembly is not fully immersible over the back end
of the tubing. Available heat sealed tubing materials
with maximum temperature ratings:
•
•
Polyethylene: 176°F (80°C)
Mylar: 257°F (125°C)
Special Coding (cont.)
Type E Insulations
A polyimide sleeve is epoxied over the weld joints (as
in the Type B insulations) and then multiple conformal
dip coatings are applied (as in the Type C insulations)
for fully immersible assemblies. The same insulating
material options are available.
Insulated Extension Leads
The standard insulated extension lead sub assembly
has 38 gauge 0.004 in (0.10 mm) diameter, nickel alloy
200, bifilar, heavy ISONEL insulation over conductors
and a length of 6.5 (1.98 m) ±1/2 ft (±0.15 m). Other
options, including any specified by the customer, are
available upon special order.
Wire Gauges
#38 GA 0.004 in (0.10 mm), #40GA 0.0031 in (0.079 mm)
Conductors
Nickel alloy 200
Insulation
• Heavy ISONEL: for use to 356°F (180°C), excellent abrasion resistance, our standard coating.
• Polyurethane: for use to 221°F (105°C), easily
stripped, excellent solderability.
• Polyimide: for use to 446°F (230°C), excellent thermal and dielectric properties, (not recommended for
water and certain other conductive fluids)
Table 1: Standard Sizes of
NTC Type AB6 Thermistor Assemblies
Thermistor Maximum
Maximum Diameter of Assembly
TypeThermistor
Diameter
in (mm)
A8
B2 B4 C8 D2 E3 E5 E8
BR11 0.012
0.014 0.018 0.0140.0220.0340.0200.0220.024
(0.30)
(0.35) (0.45) (0.35)(0.55)(0.86)(0.50)(0.55)(0.60)
BR14 0.016
(0.40)
0.016 0.021 0.0160.0240.0360.0220.0250.027
(0.40) (0.53) (0.40)(0.60)(0.91)(0.55)(0.63)(0.68)
BR16 0.017
(0.43)
0.017 0.022 0.0170.0250.0370.0230.0260.028
(0.43) (0.55) (0.43)(0.63)(0.93)(0.58)(0.66)(0.71)
BR23 0.025
(0.63)
0.025 0.032 0.0250.0330.0450.0310.0360.038
(0.63) (0.81) (0.63)(0.83)(1.14)(0.78)(0.91)(0.96)
BR32 0.033
(0.83)
0.033 0.040 0.0330.0410.0530.0390.0440.046
(0.83) (1.01) (0.83)(1.04)(1.34)(0.99)(1.11)(1.16)
BR42 0.046
(1.16)
0.046 0.053 0.0460.0540.0660.0520.0570.059
(1.16) (1.34) (1.16)(1.37)(1.67)(1.32)(1.44)(1.49)
BR55 0.060
(1.52)
0.060 0.070 0.0600.0680.0800.0660.0740.076
(1.52) (1.77) (1.52)(1.72)(2.03)(1.67)(1.87)(1.93)
GC 11 0.012
(0.30)
0.014 0.018 0.0140.0220.0340.0200.0220.024
(0.35) (0.45) (0.35)(0.55)(0.86)(0.50)(0.55)(0.50)
GC 14 0.016
(0.40)
0.016 0.021 0.0160.0240.0360.0220.0260.027
(0.40) (0.53) (0.40)(0.60)(0.93)(0.55)(0.63)(0.68)
GC 16
0.017
(0.43)
0.017 0.022 0.0170.0250.0370.0230.0260.028
(0.43) (0.55) (0.43)(0.63)(0.93)(0.58)(0.66)(0.71)
GC 32 0.033
(0.83)
0.033 0.040 0.0330.0410.0530.0390.0440.046
(0.83) (1.01) (0.83)(1.04)(1.34)(0.99)(1.11)(1.16)
Construction
• Bifilar: Parallel conductors, our standard
• Single: Individually insulated lead-wires
• Twisted Pair: 0.1 in (2.54 mm) lay typical
Length
6.5 ft (1.98 m) ±0.5 ft (±0.15 m) is standard, specify
other lengths as desired. All lengths over one foot are
supplied on a plastic bobbin with the wires wrapped so
that the thermistor end is removed last.
Amphenol
Advanced Sensors
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-920-254B-04/2014
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