Diaphragm seals

In-line diaphragm seal with sterile connection

For sanitary applications
Models 981.22, 981.52 and 981.53, clamp connection
WIKA data sheet DS 98.52

Applications

■■ For direct, quickly removable installation in pipelines

■■ For flowing, pure media
■■ Pharmaceutical industry, biotechnology industry,
production of active ingredients
■■ Aseptic plants

Special features

■■ Completely round diaphragm (Europ. Pat. No. 0609846) to In-line diaphragm seal with sterile connection,
avoid dead spaces model 981.22
■■ Self-draining in all mounting positions
■■ Quick cleaning of measuring point, without residue
■■ Suitable for SIP and CIP
■■ EHEDG certified and 3-A compliant

Description can be mounted directly into the pipeline, meaning no

special measuring point connection is required. Through the
Diaphragm seals are used to protect the pressure measuring integration into the process line, turbulences, dead spaces,
instrument from aggressive, adhesive, crystallising, corners and other obstructions can be avoided. For this
corrosive, highly viscous, environmentally hazardous or diaphragm seal WIKA uses a completely round diaphragm,
toxic media. A diaphragm made of the appropriate material which, due to the unobstructed flow of the media, produces
provides for the separation from the medium to be measured. an automatic cleaning of the chamber.
Thus even the most difficult measuring requirements can be
met by combining measuring instruments with diaphragm The diaphragm seal systems can withstand the cleaning
seals. vapour temperatures occurring in the SIP processes and
thus ensure a sterile connection between the medium to be
A fluid inside the system, which can be chosen to suit the measured and the diaphragm seal.
particular application, hydraulically transmits the pressure to
the measuring instrument. Assembly of the diaphragm seal and measuring instrument
is made via a direct assembly as standard or optionally via a
Almost limitless application possibilities exist due to the cooling element or a flexible capillary.
large number of available variants, such as diaphragm seal
designs or materials. The type of process connection (flange, For the material selection WIKA offers a variety of solutions,
threaded and sterile connection) and the basic method of in which the upper body and the diaphragm are made of
manufacture are important design differentiation criteria. identical materials. Stainless steel 316L (1.4435) is used as
standard material, other special materials are available on
For further technical information on diaphragm seals and request.
diaphragm seal systems see IN 00.06 “Application, operating
principle, designs“. Measuring systems with model 981.22, 981.52 and 981.53
WIKA diaphragm seals are successfully used in the life
The model 981.22, 981.52 and 981.53 in-line diaphragm science industry, in food production, pharmaceutical and
seals with clamp connections, due to their circular design, biotechnology applications.

WIKA data sheet DS 98.52 ∙ 09/2016 Page 1 of 5

Data sheets showing similar products:

Version with thread; model 981.18 ... 21; see data sheet DS 98.40
Version with NEUMO BioConnect®; model 981.50; see data sheet DS 98.50
Version with aseptic connection; model 981.51; see data sheet DS 98.51
Standard version Options

Type of process connection ■■ Higher nominal pressures on request (for maximum

Model 981.22: Clamp connection pressure range consider pressure rating of clamp)
Model 981.52: Clamp connection per DIN 32676 ■■ Surface roughness of wetted parts
Model 981.53: Clamp connection per ISO 2852 Ra ≤ 0.38 µm per ASME BPE SF4, only with
For exact designs and nominal widths see tables on page 4 electropolished surface (except for weld seam)
■■ Sealing from NBR or PTFE
Nominal pressure ■■ Zero point stabilisation (ZPS, required for SIP processes,
See tables on page 4 EHEDG tested)
■■ Connection to the measuring instrument
Measuring ranges G 1/2, G 1/4, 1/2 NPT or 1/4 NPT (female)
min. 0 ... 0.6 bar, max. 0 ... 40 bar ■■ Origin of wetted parts (EU, CH, USA)
(also vacuum and +/- measuring ranges) ■■ Marking of the diaphragm seal in accordance with the
applicable 3-A standard
Material of main body
Stainless steel 1.4435 (316 L)
Materials
Material of wetted parts
Diaphragm: Stainless steel 1.4435 (316L) Main body Wetted part: Diaphragm
Standard
Surface roughness of wetted parts
Ra ≤ 0.76 µm per ASME BPE SF3 (except for weld seam) Stainless steel 1.4435 (316L) Stainless steel 1.4435 (316L)
Option
Level of cleanliness of wetted parts Stainless steel 1.4435 (316L), Stainless steel 1.4435 (316L),
Oil and grease free per ASTM G93-03 level E (WIKA electropolished 1) electropolished 1)
standard) and ISO 15001 (< 550 mg/m2) Stainless steel 1.4539 (904L) Stainless steel 1.4539 (904L)
Hastelloy C276 (2.4819) Hastelloy C276 (2.4819)
Connection to the measuring instrument
Weld-in connection
1) Only in connection with a surface roughness of Ra ≤ 0.38 µm for the wetted parts

Further material combinations on request

Installation example
In-line diaphragm seal, sterile connection, model 981.22
with directly assembled pressure gauge in a pipeline

Pressure measuring instrument

(pressure gauge or transmitter)

Direct assembly

Diaphragm seal

Diaphragm, in-line diaphragm

(welded with diaphragm seal)

Clamp
Not included
Sealing in delivery
Welding socket
Pipe inner
Ø Mb

Flange Ø D

P4_Z_1875.01

Insertion length L

Page 2 of 5 WIKA data sheet DS 98.52 ∙ 09/2016

Additional information for diaphragm Options for diaphragm seal systems
seal systems
■■ Connection to the measuring instrument via cooling
See Technical information IN 00.06 "Diaphragm seals, element or capillary
application, operating principle, designs" ■■ Further pressure measuring instruments possible
■■ Vacuum service (suitable for vacuum operation)
■■ Pressure measuring instrument model ■■ Higher level of cleanliness of wetted parts
■■ Connection to the measuring instrument: Direct assembly - Oil and grease free per ASTM G93-03 level D and
(for types of instrument connection see below, calibrated ISO 15001 (< 220 mg/m2)
in the mounting position selected for the in-line diaphragm - Oil and grease free per ASTM G93-03 level C and
seal) ISO 15001 (< 66 mg/m2)
■■ Process temperature ■■ Height difference between measuring point and pressure
■■ Ambient temperature measuring instrument with capillary in metre increments
■■ System fill fluid (max. 7 m with silicone oils/edible oils)
- Recommendation for the food and beverage production: ■■ Mounting bracket (required for connection to the
Neobee® KN 59 (FDA 21 CFR 172.856, 21 CFR 174.5) measuring instrument via capillary, model 910.16, data
- Recommendation for pharmaceutical and cosmetics sheet AC 09.07)
applications: Medicinal white mineral oil KN 92 (FDA 21 - Form H per DIN 16281, 100 mm, aluminium, black
CFR 172.878, 21 CFR 178.3620(a); USP, EP, JP) - Form H per DIN 16281, 100 mm, stainless steel
- Bracket for pipe mounting, for pipe Ø 20 ... 80 mm, steel
■■ Special version
- Complete measuring assembly autoclavable, on request

Assembly of the pressure measuring instrument

■■ For horizontal pipelines ■■ For vertical pipelines

Variant 1 Variant 1
- Pressure measuring instrument: - Pressure measuring instrument:
Lower mount (LM) Connection location at 3 o'clock
- Pointer shaft: Crosswise to flow - Pointer shaft: Crosswise to flow
direction direction
- Assembly: Direct assembly, - Assembly: Direct assembly, vertical
horizontal pipeline pipeline

Variant 2 Variant 2
- Pressure measuring instrument: - Pressure measuring instrument:
Lower mount (LM) Connection location at 9 o'clock
- Pointer shaft: Parallel to flow - Pointer shaft: Crosswise to flow
direction direction
- Assembly: Direct assembly, - Assembly: Direct assembly, vertical
horizontal pipeline pipeline

Variant 3 Variant 3
- Pressure measuring instrument: - Pressure measuring instrument:
Lower back mount (LBM) Lower back mount (LBM)
- Pointer shaft: Crosswise to flow - Pointer shaft: Crosswise to flow
direction direction
- Assembly: Direct assembly, - Assembly: Direct assembly, vertical
horizontal pipeline pipeline

Variant 4
- Pressure measuring instrument:
Connection location at 12 o'clock
- Pointer shaft: Crosswise to flow
direction
- Assembly: Direct assembly,
horizontal pipeline

WIKA data sheet DS 98.52 ∙ 09/2016 Page 3 of 5

Dimensions in mm
Model 981.22
Type of process connection: Clamp connection 2) Type of process connection: Clamp connection per
per DIN 32676 DIN 32676
Pipe standard: Pipes per DIN 11866 row B or Pipe standard: Pipes per DIN 11866 row C or ASME BPE
ISO 1127 row 1

DN For pipe PN 1) Dimensions in mm DN For pipe PN 1) Dimensions in mm

Outer Ø x wall Outer Ø x wall
thickness L D Mb thickness L D Mb
13.5 13.5 x 1.6 40 114 25 10.3 1" 25.4 x 1.65 40 114 50.5 22.1
17.2 17.2 x 1.6 40 114 25 14.0 1 ½" 38.1 x 1.65 40 146 50.5 34.8
21.3 21.3 x 1.6 40 114 50.5 18.1 2" 50.8 x 1.65 40 156 64 47.5
26.9 26.9 x 1.6 40 114 50.5 23.7 2 ½" 63.5 x 1.65 40 156 77.5 60.2
33.7 33.7 x 2 40 114 50.5 29.7 3" 76.2 x 1.65 25 156 91 72.9
42.4 42.4 x 2 40 146 64 38.4 1) For maximum pressure range consider pressure rating of clamp.
48.3 48.3 x 2 40 146 64 44.3
60.3 60.3 x 2 40 156 77.5 56.3
76.1 76.1 x 2 25 156 91 72.1
1) For maximum pressure range consider pressure rating of clamp.
2) EHEDG conformity only in combination with ASEPTO-STAR k-flex upgrade, sealing from
Kieselmann GmbH.

Type of process connection: Clamp connection

Pipe standard: Pipes per BS4825 part 3 and O.D.-tube

DN For pipe PN 1) Dimensions in mm

Outer Ø x wall
thickness L D Mb
½" 12.7 x 1.6 40 114 25 9.55
¾" 19.05 x 1.6 40 114 25 15.7
1" 25.4 x 1.6 40 114 50.5 22.2
1 ½" 38.1 x 1.6 40 146 50.5 34.9
2" 50.8 x 1.6 40 156 64 47.6
2 ½" 63.5 x 1.6 40 156 77.5 60.3
3" 76.2 x 1.6 25 156 91 73.0
1) For maximum pressure range consider pressure rating of clamp.

Model 981.52 Model 981.53

Type of process connection: Clamp connection 2) Type of process connection: Clamp connection 2)

per DIN 32676 per ISO 2852

Pipe standard: Pipes per DIN 11866 row C or Pipe standard: Pipes per ISO 2037 and BS 4825
DIN 11850 row 2 part 1
DN For pipe PN 1) Dimensions in mm DN For pipe PN 1) Dimensions in mm
Outer Ø x wall Outer Ø x wall
thickness L D Mb thickness L D Mb
25 29 x 1.5 40 114 50.5 26 25 25 x 1.2 40 114 50.5 22.6
32 35 x 1.5 40 146 50.5 32 28 28 x 1.2 40 114 50.5 25.6
40 41 x 1.5 40 146 50.5 38 33.7 33.7 x 1.2 40 146 50.5 31.3
50 53 x 1.5 40 156 64 50 38 38 x 1.2 40 146 50.5 35.6
65 70 x 2 25 156 91 66 40 40 x 1.2 40 146 64 37.6
80 85 x 2 25 156 106 81 51 51 x 1.2 40 156 64 48.6
100 104 x 2 25 156 119 100 63.5 63.5 x 1.6 40 156 77.5 60.3
70 70 x 1.6 25 156 91 66.8
1) For maximum pressure range consider pressure rating of clamp.
2) EHEDG conformity only in combination with ASEPTO-STAR k-flex upgrade, sealing from 76.1 76.1 x 1.6 25 156 91 72.9
Kieselmann GmbH.
88.9 88.9 x 2 25 156 106 84.9
101.6 101.6 x 2 25 156 119 97.6
1) For maximum pressure range consider pressure rating of clamp.
2) EHEDG conformity only in combination with ASEPTO-STAR k-flex upgrade, sealing from
Kieselmann GmbH.

Page 4 of 5 WIKA data sheet DS 98.52 ∙ 09/2016

 Approvals
Logo Description Country
EU declaration of conformity European Union
Pressure equipment directive
3-A USA
®

Sanitary Standard
EHEDG European Union
Hygienic Equipment Design

Certificates (option)
■■ 2.2 test report per EN 10204 (e.g. state-of-the-art
manufacturing, material proof, indication accuracy for
diaphragm seal systems)
■■ 3.1 inspection certificate per EN 10204 (e.g. material
proof for wetted metallic parts, indication accuracy for
diaphragm seal systems)
■■ FDA conformity of the system fill fluid
■■ 3-A conformity of the diaphragm seal, based on a third
party verification
■■ EHEDG conformity
■■ Manufacturer‘s declaration for food contact materials
regarding regulation (EC) No. 1935/2004
■■ Others on request

Approvals and certificates, see website

Ordering information
Diaphragm seal:
Diaphragm seal model / Process connection (type of process connection, pipe standard, pipe dimension) / Material (main
body, diaphragm) / Surface roughness of wetted parts / Sealing / Zero point stabilisation (ZPS) / Connection to the measuring
instrument / Level of cleanliness of wetted parts / Origin of wetted parts / Certificates

Diaphragm seal system:

Diaphragm seal model / Process connection (type and specification of process connection, pipe standard, pipe dimension) /
Material (main body, diaphragm) / Surface roughness of wetted parts / Sealing / Zero point stabilisation (ZPS) / Pressure
measuring instrument model (per data sheet) / Assembly (direct assembly horizontal/vertical, cooling element horizontal /
vertical, capillary) / min. and max. process temperature / min. and max. ambient temperature / Vacuum service / System fill
fluid / Certificates / Height difference / Level of cleanliness of wetted parts / Origin of wetted parts / Mounting bracket

© 11/2002 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.

WIKA data sheet DS 98.52 ∙ 09/2016 Page 5 of 5

09/2016 EN

WIKA Alexander Wiegand SE & Co. KG

Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. +49 9372 132-0
Fax +49 9372 132-406
info@wika.de
www.wika.de