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Series 385HL Heavy-Duty Well for
3
⁄8" Diameter Elements
Application:
Standard length,
3
⁄8" stem, bimetal thermometers.
#14-gage thermocouple elements. Armored
liquid-in-glass test thermometers. Other temperaturesensing elements having 0.377" maximum diameter.
Connection Size:
1 NPT is standard. Other thread sizes are available
upon request.
Series 385HL—Lagging Extension Type External Thread “P”– 1 NPT
3
/
WRENCH
WRENCH
ALLOWANCE
ALLOWANCE
To Order Visit omega.com/series_385hl for Pricing and Details
1
/
NPSM
2
LAGGING
EXTENSION
†
T
4
1
THREAD
ALLOWANCE
P NPT
A STEM LENGTH
Dimensions: inches
External Lagging Stem Insert Shank
Thread Extension Length Length Diameter
P Model Number T A U Q
1 NPT 1-385HL-U21/2-(*) 2 6 2
1-385HL-U41/2-(*) 3 9 41⁄2 1
1-385HL-U71/2-(*) 3 12 71⁄2 1
1-385HL-U101/2-(*) 3 15 101⁄2 1
1-385HL-U131/2-(*) 3 18 131⁄2 1
1-385HL-U191/2-(*) 3 24 191⁄2 1
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: 1-385HL-U71/2-304SS, 304 stainless steel thermowell with 1 NPT external thread,
0.385" internal diameter, 3" Lagging Extension, 7
For Assistance in Choosing Head and Well Assemblies, See omega.com. These wells are
compatible with OMEGA® NB1, NB2; PR-12, PR-14, and NPT-style probes, as well as DialTemp™
Thermometers.
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.
U INSERTION LENGTH
Q DIA.
1
⁄2" insertion length, and a 12" stem length.
± 0.002
0.385 BORE
49
/
64
DIA.
†
NPSM internal
pipe thread will accept
both NPT and
1
NPS male threads.
/
4
1
⁄2 11⁄16
Metric Models
Available!
See Pages
omega.com
1
⁄16
1
⁄16
1
⁄16
1
⁄16
1
⁄16
Shown
smaller
than
actual
size.
See Introduction to Thermowells,
Maximum Fluid Velocity—feet per second
Well Type
2
1" - 385H Brass 321 (150) 129 (83.5) 46.8 23.6 14.5 9.6 6.9 5.1
and Carbon Steel 410 (270) 249 (150) 90.3 45.6 27.8 18.5 13.2 9.8
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”
1" - 385HL A.I.S.I. 304 & 316 483 (350) 272 (208) 97.3 49.7 30.4 20.3 14.5 10.7
Monel 396 (300) 214 (167) 77.5 39.2 23.8 16.0 10.3 7.7
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-25
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