ORDERING CODE

Example:

02

312

S

S

02T

XCK

NH

Process Connection Size

02 - ¼ NPT Male (available for 311 only)

02

04 - 1/2 NPT Male (available for 311 only)

06 - ¾ NPT Male (available for 311 only)

08 - 1 NPT Male (available for 311 only)

25 - ¼ NPT Female

50 - 1/2 NPT Female

75 - ¾ NPT Female (available for 311 only)

10 - 1 NPT Female (available for 311 only)

Seal Type

311 - Threaded All-welded midi seal no flushing port

312 - Threaded All-welded midi seal with flushing port

312

Diaphragm Material

S - 316L Stainless steel

S

U - Tantalum

H - Hastelloy® C-276

Bottom Housing Material

S - 316L Stainless steel

S

H - Hastelloy® C-276

Instrument Connection Size

02T - ¼ NPT Female

02T

04T - 1/2 NPT Female

Options (if choosing an option(s) must include an “X”)

X__

Fill Fluid (See Table 1 on page 2 for more available fill fluids)

CK - 50 cSt Silicone

CK

Optional Features

PU - Pipe plug for flushing connection (plug will match bottom housing material; 312 seal only)

NH - Stainless steel instrument

NH

DU - Instrument welded to seal (instrument must be of like-material to top housing)

MQ - Positive material identification

W1 - Dye penetrant testing

6B - Cleaned for oxygen service

All specifications are subject to change without notice.

All sales subject to standard terms and conditions.

©2019 Ashcroft Inc. 311-312_midi_ds1.0, Rev. A, 04/19

ashcroft.com

info@ashcroft.com

1.800.328.8258

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311/312 All-Welded Midi Threaded Seals

Data Sheet