Thermocouple Heads
Dimensions: mm (in)
76
(3)
NB1 Cast Iron
59
)
5
16
⁄
(2
92
(35⁄8)
(3
86
3
⁄8)
)
⁄8
1
54
(2
NB4
Aluminum
(2
67
5
)
⁄8
(1
86
(3.4)
48
7
⁄
MOST POPULAR
MODELS HIGHLIGHTED!
To Order (Specify Model No.)
Material Type Number Each
8
)
Cast Iron NB1 NB1-2 26
Burnished NB2-0 $23
Die-Cast NB2 NB2-2 26
Aluminum NB2-4 28
Aluminum NB3 NB3-2 28
Aluminum NB4 NB4-0 $23
Model Price
NB1-0 $23
NB1-4 28
NB3-0 $25
NB3-4 30
NB4-4 28
⁄16)
1
78
(3
76
(3)
NB2
Burnished Die Cast Aluminum
92
5
(3
)
⁄
8
(3
79
Cast Iron NB5 NB5-2 43
NB5-0 $40
95
(3.8)
NB5-4 45
NB6-0 $23
Aluminum NB6 NB6-2 26
NB6-4 28
NB5 Cast Iron
1
)
⁄
8
Ordering Examples: NB1-0, cast iron head
with no terminal block, $23.
NB6-2, deep base aluminum head with a
2-terminal terminal block (for 1 thermocouple
element), $26.
82
(3.2)
82
(3.2)
NB3 Aluminum
110
(4
5
)
⁄16
NB6
Deep Base
B-9
Threaded Openings
Wt Protection Extension
Terminals (oz) Tube Entry Wire Entry Features
0 = no terminal block 22
2 = single element 23
4 = duplex element 24
1
⁄2 NPT
1
⁄2 NPT
• Rugged construction
• Screw cover with
inside thread
• Moisture and dust resistant
• Ideal for outdoor use
• Standard size
max 14-gage wire
0 = no terminal block 5
2 = single element 6
1
⁄2 NPT
4 = duplex element 61⁄2 Standard
max 14-gage wire
1
⁄2 NPT
with
compression
fitting for 1⁄8 to
1
⁄4" OD wire
• Small and lightweight
• Good corrosion resistance
• Gasketed, weather resistant
• Burnished finish
• Safety chain on cover
• Medium size
Terminal Blocks for
Connection Heads
(Order separately
or included with heads
with -2 or -4 suffixes)
Ceramic Block with
Nickel Plated Brass
Terminals for NB2
Head for Gage 14
Wire Maximum
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model No.)
Model No. Price Terminals Wt g (oz)
CH-49 $4 2 = single 43 (11⁄2)
CH-50 6 4 = duplex 57 (2)
B
0 = no terminal block 8
2 = single element 91⁄4
1
⁄2 NPT
4 = duplex element 93⁄4
max 14-gage wire
0 = no terminal block 21⁄2
2 = single element 31⁄8 M10 x1
4 = duplex element 31⁄4
max 14-gage wire
works with
1
⁄8 NPT
0 = no terminal block 56
2 = single element 571⁄2 NPT
4 = duplex element 58
max 14-gage wire
0 = no terminal block 83⁄4
2 = single element 93⁄41⁄2 NPT
4 = duplex element 103⁄4
max 14-gage wire
compression
compression
compression
Bakelite
CH-76.
1
⁄2 NPT
M16 x 1.5
with
fitting
1
⁄2 NPT
with
fitting
1
⁄2 NPT
with
fitting
• Hinge top
• Lightweight aluminum
• Standard size
• Metric
• Miniature size
• Good corrosion resistance
• Uses miniature barrier
strip connector (optional)
• Rugged cast iron
• High-temperature painted
finish
• Safety chain on cover
• Standard size
• Deep base
• Lightweight aluminum
• Standard size
Bakelite
CH-78.
Ceramic
Blocks
with Brass
Terminals for
Type NSA,
NSB, NSC, and
NBS Connection
Heads for Max
8-Gage Wire
Model No. Price Terminals Wt g (oz)
CH-47 $6 2 = single 85 (3)
CH-48 8 4 = duplex 128 (41⁄2)
Ceramic Blocks with
Brass Terminals
for Type NBN,
NB3, NBG, NXT,
NB1, and NBB
Connection
Heads for Max
14-Gage Wire
Model No.* Price Terminals Wt g (oz)
CH-73 $3 2 = single 35 (11⁄4)
CH-74 5 4 = duplex 50 (13⁄4)
*For NB1 heads, add suffix “-NB1” to model
number; no additional charge.
Ceramic
CH-83.
All models shown smaller than actual size.
Ceramic
CH-84.
Bakelite
CH-77.
B-10
†
Model
Wt
No. Price Desc Material Term g (oz)
CH-83 $4 For NB4 Ceramic 2 28 (1)
CH-84 4 For NB4 Ceramic 4 28 (1)
CH-76 4 Bakelite 2 77 (2
CH-77 4 Bakelite 3 77 (2
CH-78 4 Bakelite 4 77 (2
†
These are alternatives, not standard with
“-2” or “-4” suffixes on thermocouple heads.
For NBG,
NB5, NB6,
NB, NB9
and NB12
1
⁄2)
1
⁄2)
1
⁄2)
Thermocouple Heads
Dimensions: mm (in)
76
(3)
61.5
(2.4)
MOST POPULAR
MODELS HIGHLIGHTED!
To Order (Specify Model No.)
Model Price
Material Type Number Each
93
(3.7)
86
(3.4)
NB7 Flip Top
70
(2.8)
68
(2.7)
NB10 Miniature Bakelite
66.5
(2.6)
61.5
(2.4)
Aluminum NB7 NB7-2 26
NB7-0 $23
NB7-4 28
NB8-0 $23
Aluminum NB8 NB8-2 26
NB8-4 28
Glass NB9-0 $23
Reinforced NB9 NB9-2 26
Nylon NB9-4 28
NB10-0 $23
Bakelite NB10 NB10-2 26
NB10-4 28
NB11-0 $23
Aluminum NB11 NB11-2 26
NB11-4 28
NB12-0 $23
Aluminum NB12 NB12-2 26
NB12-4 28
NB8 Domed Top
87
(3.4)
NB9 Glass Reinforced Nylon
82
(3.2)
NB11 Miniature Aluminum
87
(3.4)
NB12 Low Profile
B-11
82
(3.2)
Cast NEPA NEPA-0 $85
Aluminum NEPA-2 88
Body and NEPA-4 91
Cap
NEPB NEPB-2 88
NSA NSA-2 53
Cast Iron NSB NSB-2 53
NSC NSC-2 53
Ordering Examples: NB10-0 is a bakelite
head with no terminal block, $23.
NB7-4 is a flip-top aluminum head with a
4-terminal terminal block (for 2 thermocouple
elements), $28.
NEPB-0 $85
NEPB-4 91
NSA-0 $50
NSA-4 55
NSB-0 $50
NSB-4 55
NSC-0 $50
NSC-4 55
Threaded Openings
Wt Protection Extension
Terminals (oz) Tube Entry Wire Entry Features
B
108
(41⁄4)
0 = no terminal block 83⁄4
2 = single element 93⁄4
4 = duplex element 103⁄4
1
⁄2 NPT
1
⁄2 NPT
• Lightweight aluminum
construction
• Flip top
• Moisture and dust resistant
• Ideal for outdoor use
• Standard size
max 14-gage wire
0 = no terminal block 8
2 = single element 9
4 = duplex element 10
max 14-gage wire
0 = no terminal block 5
2 = single element 6
4 = duplex element 7
1
⁄2 NPT
1
⁄2 NPT
1
⁄2 NPT
with
compression
fitting
1
⁄2 NPT
wtih
compression
fitting
• Small and lightweight
• Domed top
• Gasketed, weather resistant
• Secure screw thread
• Safety chain on cover
• Medium size
• Very lightweight construction
• Safety chain on cover
• Good corrosion resistance
• Standard size
max 14-gage wire
0 = no terminal block 27⁄8
2 = single element 37⁄8
4 = duplex element 47⁄8
1
⁄2 NPT
3
⁄8 NPT
• Ultra lightweight
construction
• Safety chain on cover
• High temperature plastic
max 14-gage wire
0 = no terminal block 47⁄8
2 = single element 57⁄81⁄2 NPT
4 = duplex element 67⁄8
max 14-gage wire
0 = no terminal block 93⁄4
2 = single element 103⁄41⁄2 NPT
4 = duplex element 113⁄4
max 14-gage wire
0 = no terminal block 161⁄23⁄4 NPT
2 = single element 17
3
⁄4
4 = duplex element 181⁄4
max 14-gage wire
1
⁄2 NPT
0 = no terminal block 211⁄2
2 = single element 223⁄4
4 = duplex element 231⁄4
3
⁄8 NPT
with
compression
fitting
1
⁄2 NPT
3
⁄4 NPT
1
⁄2 NPT
• Miniature size
• Miniature size
• IP 67 Sealed
• Safety chain on cover
• Lightweight construction
• Miniature size
• Low profile
• Safety chain on cover
• Lightweight construction
• Standard size
• Explosion resistant head*
• Rated for: Class III
Class I, Group C, D
Class II, Groups E, F, G
• Screw cover
• Moisture and dust resistant
• Ideal for outdoor use
• Utilizes barrier strip
connector (optional)
max 14-gage wire
0 = no terminal block 421⁄2 NPT
2 = single element 46
4 = duplex element 48
max 8-gage wire
0 = no terminal block 403⁄4 NPT
2 = single element 44
4 = duplex element 46
max 8-gage wire
0 = no terminal block 36 1 NPT
2 = single element 40
3
⁄4 NPT
3
⁄4 NPT
3
⁄4 NPT
• Rugged construction
• Screw cover with inside
thread
• Moisture and dust resistant
• Ideal for outdoor use
• Standard OMEGA
heavy-duty head
• Cover equipped with safety
chain (readily removed
without tools)
• Standard size
4 = duplex element 42
max 8-gage wire
*Note: The use of explosion resistant heads does not imply that a
complete assembly is either explosion proof or intrinsically safe. It is the
user’s responsibility to determine suitability of materials for an installation.
108
(41⁄4)
NSA, NSB, NSC
Cast Iron
92
(
)
35⁄8
Discount Schedule
1-10 Units. . . . . Net
11-24 Units . . . . 5%
25-100 Units . . 10%
NEMA 4X (IP66)
Rated Heads Available.
Please Consult our
Technical Quotations
Department
Sanitary Polypropelene
and Stainless Steel
Heads Available. Visit
omega.com/sanitary
)
86
3
8
⁄
3
(
111
(43⁄8)
89
(31⁄2)
NEPA and NEPB
Explosion Resistant
101 and Up,
Consult Sales
B-12
Thermocouple Heads
108
76
(3)
(41⁄4)
MOST POPULAR
MODELS HIGHLIGHTED!
To Order (Specify Model No.)
Model Price
Material Type Number Each
89
1
)
2
⁄
(3
111
(43⁄
8
)
NBG Bakelite Glass Fiber
83
(31⁄
4
)
102
(4)
NBN
Nylon
108
76
(41⁄4)
(3)
NBS
Cast Aluminum
(4
89
(31⁄
2
)
NEP-T Cast Iron with Aluminum Cap
Explosion Resistant
101
(4)
108
1
Nylon NBN NBN-2 22
NBN-0 $19
NBN-4 24
86
(3
3
)
8
⁄
Bakelite
Glass NBG-0 $19
Fiber NBG NBG-2 22
NBG-4 24
133
1
(5
)
⁄
4
)
⁄
4
Die-Cast NBB NBB-2 26
Aluminum NBB-4 29
NBB-0 $23
NBS NBS-0 $30
Cast NBS NBS-2 34
Aluminum NBS-4 36
Cast Iron
with NEP-T NEP-T0 $75
Aluminum NEP-T2 77
117
Cap NEP-T4 79
(45⁄8)
76
(3)
NBB
Die-Cast Aluminum
Dimensions: mm (in)
Discount Schedule
1-10 Units. . . . . Net
11-24 Units . . . . 5%
25-100 Units . . 10%
76
(3)
101 and Up,
Consult Sales
(2
73
Aluminum NXT NXT-2 30
NXT-0 $27
NXT-4 32
102
(4)
®
Feraloy
HEP-TX-0 $80
Iron Alloy HEP-TX HEP-TX-2 83
HEP-TX-4 85
HEP-TX70 85
HEPTX Feraloy®Iron Alloy
67
5
(2
⁄
8
108
)
Note: Barrier strips are utilized when
more than 4 connections are required.
e.g.: dual element 3-wire RTD.
Transmitter may be mounted in most heads.
108
(41⁄4)
Transmitter may not be mounted in NB4 and
only the smallest transmitters can fit the NB2
head by special order.
Check transmitter dimensions identified by
individual product specifications as well as
the internal dimensions for the head given
in Section Z.
Ordering Example: NEP-T4, cast iron
thermocouple head with aluminum cap, $79.
7
)
8
⁄
NXT
Aluminum
(41⁄4)
B-13
Threaded Openings
Terminals (oz) Tube Entry Wire Entry Features
0 = no terminal block 3
2 = single element 41⁄2 NPT
4 = duplex element 5
max 14-gage wire
Wt Protection Extension
Supplied
with nylon
bushing for
plastic
covered
extension
wire to
0.24" to
0.40" OD
• Easy access to terminal block
• Suitable for use in ambient
temperatures to121°C (250°)°F
• Moisture and dust-resistant
• Ideal for chemical plant use
• Excellent corrosion resistance
• Very light weight
• Standard size
Bi-Metal Thermometers for
Head & Well Assemblies
See Page E-11 for Additional Models
Model J
(Shown)
$
114
1
2
⁄2", 4" and
6" Lengths
B
0 = no terminal block 6
2 = single element 71⁄2 NPT
4 = duplex element 8
max 14-gage wire
0 = no terminal block 6
2 = single element 7
4 = duplex element 8
max 14-gage wire
0 = no terminal block 15
2 = single element 181⁄2 NPT
4 = duplex element 20
max 8-gage wire
0 = no terminal block 75
2 = single element 76
4 = duplex element 76
max 14-gage wire
0 = no terminal block 11
2 = single element 12 1⁄41⁄2 NPT
4 = duplex element 12 3⁄4
max 14-gage wire
0 = no terminal block 62
2 = single element 64 1 NPT 1 NPT
4 = duplex element 64
70 = for mounting
TX70 Transmitter 663⁄4 NPT
max 14-gage wire
1
⁄2 NPT
1
⁄2 NPT
1
⁄2 NPT
1
⁄2 NPT
1
⁄2 NPT
1
⁄2 NPT
1
⁄2 NPT
3
⁄4 NPT
• Noncombustible
• Heat proof
• Acid resistant
• Alkali resistant
• Standard size
• Good corrosion resistance
• Lightweight
• Bayonet cover readily
removed without tools
• Easy access to terminal block
• Moisture and dust-resistant
• Standard size
• Good corrosion resistance
• Lightweight
• Cover, equipped with safety
chain,easily removed
• Moisture and dust-resistant
• Standard size
• Explosion resistant head*
• Rated for
Class I, Group C, D
Class II, Groups E, F, G
Class III
• Screw cover with inside thread
• Moisture and dust resistant
• Ideal for outdoor use
• Utilizes barrier strip
connector (optional)
• Tall cover with hinge top
• Ideal for big transmitters
• Utilizes barrier strip
connector (optional)
• Medium size
• Explosion resistant head
for 2-wire transmitter*
• Rated for: Class I,
Div 1&2, Groups C, D
Class II, Div 1
Groups E, F, G, Class III
• Moisture/dust-resistant
• Utilizes barrier strip
connector (optional)
⻬ Head Can Be Tilt-
Shown
smaller
than
actual
size.
Adjusted Through
a Full 90° Angle
⻬ All Stainless Steel
Welded Construction
⻬ External Recalibration
⻬ Rust and Corrosion
Proof, Leakproof,
Hermetically Sealed
⻬ Sensitive Bi-Metal
Element Silicone
⻬ Dampened for Minimum
Pointer Vibration and
Maximum Heat Transfer
⻬ Accuracy—1% of Range
⻬ Use of Thermowell Is
Recommended for
Pressure Applications
⻬ Overrange Protection—
50% Up to 500°F
Thermowells Accept:
Models A, B, G, H, L, R and S
Ceramic Fiber Insulated
Thermocouple Elements
for Head & Well Assemblies
⻬ Standard 12" Long
Thermocouple Elements
⻬ Insulation Temperature
Rating Up to 2200°F
⻬ Available In Type K,
E and J Calibrations
*Note: The use of explosion resistant heads does not imply that a
complete assembly is either explosion proof or intrinsically safe. It is the
user’s responsibility to determine suitability of materials for an installation.
See Additional
Probes in Section A.
To Order (Specify Model Number)
300 mm (12") Long with Insulation, Plus 13 mm (1⁄2") Stripped Ends Standard
AWG Price Add'I Price Add'l Price Add'l
Wire 12" 6" or 12" *6" or 12" 6" or
Size Type K Length Fraction Type E Length Fraction Type J Length Fraction
14 XC-14-K-12 $17 $3 XC-14-E-12 $17 $3 XC-14-J-12 $17 $3
20 XC-20-K-12 16 2 XC-20-E-12 16 2 XC-20-J-12 16 2
24 XC-24-K-12 16 2 XC-24-E-12 16 2 XC-24-J-12 16 2
6" = 150 mm **Silica models also available, see page A-34.
*
Price Price Price
B-14
XC Series
Starts at
$
16
Ordering Example: XC-20-K-12,
20 AWG Type K thermocouple,
300 mm (12') long with high
temperaturte NextelTMbraided
ceramic fiber insulation, $16.
One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | info@omega.com
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