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Thermocouples
Mineral Insulated
Watlow’s mineral insulated thermocouples are fast-responding,
durable, and capable of handling
high temperatures.
These thermocouples are manufactured with best-in-class
XACTPAK®, Watlow’s trademark for
metal sheathed, mineral insulated
(MI) thermocouple material.
XACTPAK responds fast because the
protective metal outer sheath allows
the use of smaller diameter
thermocouple conductors. The rock
hard compacted MgO insulation
further enhances the sensor’s ability
to “read” temperature by transferring
heat quickly to the measuring
junction.
The XACTPAK protecting sheath and
compacted insulation outperforms
bare wire thermocouples in most
applications.
Performance Capabilities
• Easily handles temperatures up
to 1200°C (2200°F)
• Meets or exceeds initial calibration
tolerances per ASTM E 230
Features and Benefits
Special mineral insulation
• Protects thermocouple from
moisture and thermal shock
• Permits operation in high
temperature, high pressure
environments
Diameters as small as 0.010 in.
(0.25 mm)
• Ideal when physical space or
extremely fast response are
critical
Flexibility of the XACTPAK
material
• Allows you to form and bend the
thermocouple, without risk of
cracking, to meet your design
requirements
Outer sheath
• Protects the wires from oxidation
and hostile environments
Wide range of sheath materials,
diameters, and calibrations
• Meet specific requirements
In-house manufacturing of
XACTPAK material
• Rigid quality control procedures
• Assures high standards are met
• Single source reliability
Custom capabilities
• Include options such as special
lead lengths, lead wires and
terminations
Applications
• Heat treating
• Furnaces/kilns
• Turbines
• Bearing temperature
• Power stations
• Steam generators
• Diesel engines
• Nuclear reactors
• Atomic research
• Jet engines and test cells
• Rocket engines
• Semiconductor manufacturing
• Refineries/oil processing
• Catalytic reformers
• Food processing
Thermocouples
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72
3. Sheath O.D. (inch)
J = 0.250
4. Connection Head
C = Polypropylene (
1
⁄2 inch NPT thermocouple
opening only)
D = Small cast iron
E = Small aluminum
H = Explosion proof (1⁄2 inch NPT and 3⁄4 inch NPT
thermocouple opening only)
5. Cold End Configuration
1 = Type 1, six inch nipple-union-nipple
2 = Type 2, four inch nipple-union
3 = Type 3, three inch nipple
4 = Type 4, no extensions
Note: Steel nipple and unions are standard.
6. Enter “0”
7. Sheath Material
A = 304 SS
F = 316 SS
Q = Alloy 600 (Type K)
8-9. Sheath Length “L” (whole inch)
Available lengths: 01 to 99, over 99 consult factory
10. Sheath Length “L” (fractional inch)
0 = Not required, complete assembly
1=
1
⁄8 3=3⁄8 5=5⁄8 7=7⁄8
2=1⁄4 4=1⁄2 6=3⁄4
11. Junction
Grounded Ungrounded
Single GU
Dual, isolated — W
12. Calibration
EJKNT
Standard limits E JKNT
Special limits 2 3 4 — 8
13. Enter “0”
14. Spring-Loading
Y = Yes
N=No
15. Special Requirements
0 = None
X = Special requirements, consult factory
AT 00
123456789101112131415
Thermocouples
Mineral Insulated
For Use With Thermowells
Style AT
Note: For a complete sensor, add thermowell
part number to the 15-digit AT part number.
For sheath length use “AR” (as required) and
factory will determine correct length.
See thermowell section, pages 144 to 146.
See the hardware section,
pages 156 to 157, for a
complete description of
Watlow connection heads.
Custom Ordering Information—Items in Bolded Green Type are preferred
with shorter lead times.
J
6 inch N-U-N Typical (2 each 1⁄2 x 3 inch steel
pipe nipples and 1 each malleable union)
4 inch N-U typical (1 each
1
⁄2 x 3 inch steel pipe
nipple and 1 each malleable union)
3
/4
in. (19 mm) NPT
Nom. 4 in. (152.4 mm)
L
1
⁄2 X 3 inch long steel pipe nipple typical
3
/4
in. (19 mm)
NPT
Nom. 2 in. (50.8 mm)
L
3
/4
in. (19 mm)
NPT
L
3
/4
in. (19 mm) NPT
Nom. 6 in.
(152.4 mm)
L
Type 1
Type 2
Type 3
Type 4
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W A T L O W
73
Thermocouples
Thermocouples
Mineral Insulated
Style AT With Thermowells
1.75 in.
(44 mm)
ìU
”
6 in.
(152 mm)
Overall Length
7.75 in. + “U”
3
/4 in. NPT
“U” Overall Length
Calibration in. (mm) in. (mm) Part Number
J
2.5 (64) 10.25 261 ATJE1SF024UJ0Y0
4.5 (114) 12.25 312 ATJE1SF044UJ0Y0
7.5 (191) 15.25 388 ATJE1SF074UJ0Y0
10.5 (267) 18.25 465 ATJE1SF104UJ0Y0
K
2.5 (64) 10.25 261 ATJE1SF024UK0Y0
4.5 (114) 12.25 312 ATJE1SF044UK0Y0
7.5 (191) 15.25 388 ATJE1SF074UK0Y0
10.5 (267) 18.25 465 ATJE1SF104UK0Y0
1.75 in.
(44 mm)
“U”
6 in.
(152 mm)
3
/4 in. NPT
Overall Length
7.75 in. + “U”
J
2.5 (64) 10.25 261 ATJE1TF024UJ0Y0
4.5 (114) 12.25 312 ATJE1TF044UJ0Y0
7.5 (191) 15.25 388 ATJE1TF074UJ0Y0
10. 5 (267) 18.25 465 ATJE1TF104UJ0Y0
K
2.5 (64) 10.25 261 ATJE1TF024UK0Y0
4.5 (114) 12.25 312 ATJE1TF044UK0Y0
7.5 (191) 15.25 388 ATJE1TF074UK0Y0
10.5 (267) 18.25 465 ATJE1TF104UK0Y0
Straight Well
Tapered Well
Rapid Ship sensors come with 316 SS straight well, nipple-union-nipple, 0.250 inch diameter
spring loaded element, small aluminum connection head and ungrounded junction.
Rapid Ship sensors come with 316 SS tapered well, nipple-union-nipple, 0.250 inch diameter
spring loaded element, small aluminum connection head and ungrounded junction.
Rapid Ship Sensors
Rapid Ship Sensors
“U” Overall Length
Calibration in. (mm) in. (mm) Part Number
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