Page 1
Series 385L Standard Threaded Well for
3
⁄8" Diameter Elements
Application:
Standard length,
3
⁄8" stem, bimetal thermometers.
#14-gage thermocouple elements. Armored liquid-inglass test thermometers. Other temperature-sensing
elements having 0.377" maximum diameter.
Connection Size:
3
⁄4 NPT and 1 NPT are standard. Other thread sizes are
available upon request.
Series 385L—Lagging Extension Type
3
/
WRENCH
WRENCH
ALLOWANCE
ALLOWANCE
1
/
2
To Order Visit omega.com/series_385l for Pricing and Details
4
EXTENSION
NPSM
T
LAGGING
†
1
THREAD
ALLOWANCE
P NPT
A STEM LENGTH
Dimensions: inches
U INSERTION LENGTH
Lagging Stem Insert
External Thread Extension Length Length
P Model Number T A U
3/4 -385L-U41/2-(*) 3 9 41⁄2
3/4 -385L-U71/2-(*) 3 12 71⁄2
3/4 -385L-U101/2-(*) 3 15 101⁄2
3/4 -385L-U131/2-(*) 3 18 131⁄2
3/4 -385L-U191/2-(*) 3 24 191⁄2
1 NPT 1-385L-U21/2-(*) 2 6 2
1-385L-U41/2-(*) 3 9 41⁄2
1-385L-U71/2-(*) 3 12 71⁄2
1-385L-U101/2-(*) 3 15 101⁄2
1-385L-U131/2-(*) 3 18 131⁄2
1-385L-U191/2-(*) 3 24 91⁄2
*
“BRASS” for brass. PFA coating available, see omega.com.
Ordering Example: 3/4-385L-U71/2-304SS, 304 stainless steel thermowell with
0.385" internal diameter, 3" Lagging Extension, 7
For Assistance in Choosing Head and Well Assemblies, See guide on omega.com. These wells are
compatible with OMEGA® NB1, NB2; PR-12, PR-14, and NPT-style probes, as well as DialTemp™
Thermometers.
3
⁄4 NPT 3/4 -385L-U21/2-(*) 2 6 2
Specify material type “304SS” for 304 stainless steel, “316SS” for 316 stainless steel, “CS” for carbon steel or
Materials:
Brass (ASTM B-16); Carbon Steel (C-1018); Stainless
Steel A.I.S.I. 304 & A.I.S.I. 316; Monel. Wells are also
available in special materials; prices on request.
Cap and Chain Options:
For Brass cap, add suffix “-CC-Brass” to the end of the
model number for an additional cost.
For 304SS cap, add suffix “-CC” to the end of the model
number for an additional cost.
Metric Models
Available!
See omega.com
49
/
64
DIA.
†
± 0.002
0.385 BORE
1
⁄2" insertion length, and a 12" stem length.
NPSM internal pipe thread
will accept both NPT and
NPS male threads.
1
/
4
3
⁄4 NPT external thread,
1
⁄2
1
⁄2
Shown close
to actual size.
See Introduction to Thermowells,
Maximum Fluid Velocity—feet per second
Well Type
2
3
⁄4” - 385S Brass 290 (145) 150 (80) 54.1 (48) 27.6 16.7 11.1 8.0 6.0
and Carbon Steel 326 (260) 192 (144) 69.5 35.4 20.5 14.3 10.3 7.7
Material
1
⁄2 41⁄2 71⁄2 101⁄2 131⁄2 161⁄2 191⁄2 221⁄2
Section on Velocity, see omega.com
Insertion Length – “U”
3⁄4” - 385L A.I.S.I. 304 & 316 349 (360) 199 71.9 36.6 21.2 14.8 10.7 8.0
Monel 316 (320) 189 (178) 68.1 34.8 20.8 14.0 10.0 7.5
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.
See omega.com for Pressure-Temperature Ratings.
B-23
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