Omega 385W Specification

Series 385W Socket-Weld Design Thermowells for

Application:

260W series fits standard length

1

⁄4" diameter elements.

385W series fits standard length 3⁄8" diameter elements.
Connection:

3

⁄4 or 1" nominal pipe size welding shoulder fits ASA
welding fittings, flanges, etc. Wells for larger pipe size
fittings are available upon request.

Materials:
Carbon Steel (C-1018); A.I.S.I. 304 & A.I.S.I. 316 are
standard. Other materials are available upon request.

Lagging Extension:

When specifying lagging extension, choose a length
which will permit the use of a standard element length.
(See 260L and 385L lengths.)

Cap and Chain Options:
For Brass cap, add suffix “-CC-Brass” to the end of the
model number in your order for an additional cost.
For 304SS cap, add suffix “-CC” to the end of the model
number for an additional cost.

3

⁄8" Diameter Elements

Series 385W

3

/

1

4

†

1

NPSM

/

2

P

PIPE SIZE

To Order Visit omega.com/series_385w for Pricing and Details

U INSERTION LENGTH

Dimensions: inches

49

/

DIA.

64

0.385 BORE

A STEM LENGTH

± 0.002

†

NPSM internal pipe thread
will accept both NPT and
NPS male threads.

1

/

4

Metric Models

Available!

See omega.com

Stem Insert

Pipe Size Length Length
P Model Number P A U

Nominal 3/4 -385W-U41/2-(*) 1.050 6 41⁄2
(1.050" Diameter) 3/4 -385W-U71/2-(*) 1.050 9 71⁄2
3 /4 -385W-U101/2-(*) 1.050 12 101⁄2
3 /4 -385W-U131/2-(*) 1.050 15 131⁄2
3 /4 -385W -U161/2-(*) 1.050 18 161⁄2

3 /4 -385W-U221/2

1” 1-385W-U21/2-(*) 1.315 4 2
Nominal 1-385W-U41/2-(*) 1.315 6 41⁄2
(1.315" Diameter) 1-385W-U71/2-(*) 1.315 9 71⁄
1-385W-U101/2-(*) 1.315 12 101⁄2
1-385W-U131/2-(*) 1.315 15 131⁄2
1-385W-U161/2-(*) 1.315 18 161⁄2

1-385W-U221/2

* Specify material type “304SS” for 304 stainless steel, “316SS” for 316 stainless steel, “CS” for carbon steel or
“BRASS” for brass. PFA coating available, see omega.com.

Ordering Example: 3/4-385W-U71/2-304SS, 304 stainless steel thermowell with

0.385" internal diameter, 7

3

⁄4” 3/4 -385W-U21/2-(*) 1.050 4 2

-(*) 1.050 24 221⁄2

-(*) 1.315 24 221⁄2

3

1

⁄2" insertion length and a 9" stem length.

⁄4" pipe outside diameter,

1

⁄2

1

⁄2

Shown smaller
than actual size.

See omega.com
for Pressure­Temperature
Ratings.

For Assistance in Choosing Head and Well Assemblies, See guide on omega.com. These wells are
compatible with OMEGA
Thermometers.

®

NB1, NB2; PR-12, PR-14, and NPT-style probes, as well as DialTemp™

See Introduction to Thermowells,

Maximum Fluid Velocity—feet per second

Well Type

2

3

⁄4" - 260W Carbon Steel 290 (106) 123 (71.2) 44.9 (42.7) 22.8 13.8 9.3 4.9

Material

1

⁄2 41⁄2 71⁄2 101⁄2 131⁄2 161⁄2 221⁄2

Section on Velocity, see omega.com

Insertion Length – “U”

A.I.S.I. 304 & 316 300 (148) 128 (99.3) 46.4 23.6 14.3 9.6 5.1

"- 260W Carbon Steel 290 (106) 143 (84.3) 51.6 (50.6) 26.2 15.9 10.6 5.7

1

A.I.S.I. 304 & 316 300 (148) 148 (117) 53.5 27.2 16.5 11.0 5.9

3

⁄4" - 385W Carbon Steel 426 (260) 192 (144) 69.5 35.4 20.5 14.3 7.7

and 1"- 385W

Where single values appear in the velocity tables, these may be considered safe for water, steam, air or gas. In the
shorter insertion lengths, consideration is given to the velocity pressure effect of water flowing at higher velocities.
The values in parentheses, therefore, represent safe values for water flow, while the unbracketed values may be
used for steam, air, gas and similar density fluids.

A.I.S.I. 304 & 316 449 (360) 199 71.9 36.6 21.2 14.8 8.0

B-27