Ashcroft 300 Specifications
Data Sheet
100/101, 200/201, 300/301 Threaded Diaphragm Seal
FEATURES
316L stainless steel top housing (standard)
Available in wide range of wetted materials
for process compatibility
Flushing port (101, 201, 301) provides for
easy cleaning of process
Continuous duty design contains process if
instrument is inadvertantly removed
TYPICAL USES
Oil and Gas
Refineries
Chemical and Petrochemical
Water and Wastewater
NACE Compliant Processes (Sour Gas
Separation)
Biogas and Biodiesel
100 Series
200 Series 300 Series
SPECIFICATIONS
Connection Style: 100, 200, 300: Threaded
101, 201, 301: Threaded with flushing port
Process Connection: ¼ to ½ NPT Female, ¼ to 1 NPT Male
Instrument Connection: ¼ to ½ NPT
Fill Fluid: See table 3 on page 3
Approvals: CRN
WETTED COMPONENTS
Diaphragm Bottom Housing Gasket
See table 1 on page 2 See table 2 on page 2
PTFE (rated for -150ºF
to 500ºF)
NON-WETTED COMPONENTS
Top Housing Bolt/Clamp Rings Nuts/Bolts
316L SS (standard),
Monel®, Titanium
Carbon steel
Zinc plated
alloy steel
Diaphragm Threaded
To Top Housing -
flexible design
Diaphragm Welded
or Bonded To Top
Housing - eliminates
leak path
Diaphragm Clamped
Between Upper & Lower
Housing - flexible design for
elastomeric diaphragms
KEY BENEFITS
• Protects instrumentation from corrosive media
• Prevents pressure measuring instrument
from clogging
• Dissipates elevated process temperature
All speci fications are subject to change without notice.
All sales subject to standard terms and conditions.
©2019 Ashcroft Inc. 100-200-300_thread_seal_ds1.0, Rev. B, 05/19
ashcroft.com
info@ashcroft.com
1.800.328.8258
1 of 5
Data Sheet
100/101, 200/201, 300/301 Threaded Diaphragm Seal
TABLE 1 - DIAPHRAGM MATERIALS
Material
Letter
Code
100
Series
200
Series
300
Series
316L SS S • •
304L SS C • •
904L SS F •
Monel® 400 P • •
Tantalum U • •
Hastelloy®
C-276
H • •
Hastelloy® B G • •
Hastelloy® C-22 J • •
Carpenter 20
®
D • •
PTFE T • •
®
Viton
Kalrez
®
Y • •
K • •
Nickel N • •
Titanium Ti •
Gold Plated
316L SS
W •
Notes
200-series must be
ordered with XYM
Monel® top housing
option
Temp limits:
-40°F to 400°F
Temp limits: -40°F to
350°F Max. pressure:
500 psi
Temp limits:
30°F to 212°F Max.
pressure: 500 psi
Includes titanium top
housing
TABLE 2 - BOTTOM HOUSING MATERIALS
Material
Letter
Code
Notes
316L SS S
304L SS C
904L SS F
Carbon Steel B
Monel® 400 M
Hastelloy® C-276 H
Hastelloy® B G
Hastelloy® C-22 J
Duplex 2205
Super Duplex 2507
Carpenter 20
®
®
Z
®
Contact Ashcroft for availability
A
D
Inconel® 625 W
Incoloy® 825 L
Nickel N
Titanium Ti
Only offered in ½ NPT, ¼ NPT, and socket
weld process connections. Not available with
PVDF KY
PVC V
flushing connection. PVDF Temperature Limits:
200 psi - 74°F, 125 psi - 125°F,
80 psi - 150°F
Only offered in ½ NPT, ¼ NPT, and socket
weld process connections. Not available with
flushing connection. PVC Temperature Limits:
200 psi - 74°F, 125 psi - 125°F, 80 psi - 150°F
All speci fications are subject to change without notice.
All sales subject to standard terms and conditions.
©2019 Ashcroft Inc. 100-200-300_thread_seal_ds1.0, Rev. B, 05/19
ashcroft.com
info@ashcroft.com
1.800.328.8258
2 of 5
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