981.51

On order

WIKA · Pressure measurement · Family 981

In-line diaphragm seal with sterile connection

Name: In-line diaphragm seal with sterile connection
Brand: WIKA

For sanitary applications, aseptic connection per DIN 11864

Range

0…40 bar

EHEDG3-ACRNEAC3-A Sanitary StandardEU Pressure Equipment DirectiveCE

Price

On request

Depends on configuration

Request a quote

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Description

Diaphragm seals are used for the protection of pressure measuring instruments in applications with difficult media. In diaphragm seal systems, the diaphragm of the diaphragm seal effects the separation of the instrument and the medium. The pressure is transmitted to the measuring instrument via the system fill fluid which is inside the diaphragm seal system.

For the implementation of demanding customer applications, there is a wide variety of designs, materials and system fill fluids available.

For further technical information on diaphragm seals and diaphragm seal systems see IN 00.06 'Application, operating principle, designs'.

for further approvals, see page 5

In-line diaphragm seal, model 981.51

Due to their hygienic process connection, the model 981.51 diaphragm seals are ideally suited for use in food production, pharmaceutical and biotechnology applications. The diaphragm seals can withstand the cleaning vapour temperatures occurring in the SIP processes and thus ensure a sterile connection between the medium to be measured and the diaphragm seal.

Mounting of the diaphragm seal to the measuring instruments may be made via a direct connection, for high temperatures via a cooling element or via a flexible capillary.

The availability of the diaphragm seals for common pipe standards and nominal widths simplifies integration into already existing pipe cross-sections.

Special features

Dead-space free, direct installation in pipes
Easy to open, self-draining in all mounting positions
Quick cleaning, without residue
Suitable for COP, SIP and CIP
Autoclavable version

Identification

Model	981.51
Product family	981
Subcategory	Diaphragm seal

Measuring range

Pressure ranges

0…0.6 bar · 0…40 bar · 0…8.7 psi · 0…580 psi

Process conditions

Process connection	DIN 11864-1 form A (O-ring)DIN 11864-2 form A (O-ring)DIN 11864-3 form A (O-ring)G 1/2G 1/41/2 NPT1/4 NPT
Process temperature	≤ +400 °C

Materials

Case material	Stainless steel 1.4435 (316L), Stainless steel 1.4539 (904L), Hastelloy C22 (2.4602), Hastelloy C276 (2.4819), Stainless steel 1.4435 (316L), electropolished
Wetted parts material	Hastelloy C22 (2.4602), Hastelloy C276 (2.4819), Stainless steel 1.4435 (316L), Stainless steel 1.4539 (904L), Stainless steel 1.4435 (316L), electropolished, 1.4435 (316L), 1.4435 (316L), electropolished, 1.4539 (904L)
Sealing material	O-ring

Certifications and approvals

Certifications

EHEDG3-ACRNEAC3-A Sanitary StandardEU Pressure Equipment DirectiveCE

Additional details

Datasheet languages

Tables from datasheet

Basic information

Version	In-line diaphragm seal
Pressure range ¹⁾	0 ... 0.6 bar to 0 ... 40 bar [0 ... 8.7 psi to 0 ... 580 psi] or all other equivalent vacuum or combined pressure and vacuum ranges
Connection to the measuring instrument	■ Axial gauge adapter for weld seam ■ Axial gauge adapter with female thread (e.g.G½, G¼, ½NPTor ¼NPT)
Mounting type	■ Direct mounting ■ Capillary ■ Cooling element
Level of cleanliness of wetted parts	■ Oil- and grease-free per ASTM G93-03 level F (< 1,000 mg/m 2 ) ■ Oil- and grease-free per ASTM G93-03 level D and ISO 15001 (< 220 mg/m2) ■ Oil- and grease-free per ASTM G93-03 level C and ISO 15001 (< 66 mg/m 2 )
Origin of wetted parts	■ International ■ EU, CH, USA
Surface roughness of wetted parts	■ Ra ≤ 0.76 μm [30 μin] per ASME BPE SF3 (except for weld seam) ■ Ra ≤ 0.38 μm [15 μin] per ASME BPE SF4, only with electropolished surface (except for weld seam)
Vacuum service (see IN 00.25)	■ Basic service ■ Advanced service ■ Premium service

Process connection

Standard
Aseptic threaded pipe connection DIN 11864-1 form A (O-ring)	■ Pipe standard per DIN 11866 row A or DIN 11850 row 2 ■ Pipe standard per DIN 11866 row B or DIN ISO 1127 row 1 ■ Pipe standard per DIN 11866 row C or ASME BPE 1997
Aseptic threaded pipe connection DIN 11864-2 form A (O-ring)	■ Pipe standard per DIN 11866 row A or DIN 11850 row 2 ■ Pipe standard per DIN 11866 row B or DIN ISO 1127 row 1 ■ Pipe standard per DIN 11866 row C or ASME BPE 1997
Aseptic threaded pipe connection DIN 11864-3 form A (O-ring)	■ Pipe standard per DIN 11866 row A or DIN 11850 row 2 ■ Pipe standard per DIN 11866 row B or DIN ISO 1127 row 1 ■ Pipe standard per DIN 11866 row C or ASME BPE 1997

Material	Maximum permissible process temperature ¹⁾ in °C [°F]
Body of diaphragm seal	Wetted parts 1)
Stainless steel 1.4435 (316L)	Stainless steel 1.4435 (316L)	400 [752]
Stainless steel 1.4435 (316L), electropolished 2)	Stainless steel 1.4435 (316L), electropolished 2)
Stainless steel 1.4539 (904L)	Stainless steel 1.4539 (904L)
Hastelloy C22 (2.4602)	Hastelloy C22 (2.4602)
Hastelloy C276 (2.4819)	Hastelloy C276 (2.4819)

Instrument labelling

Marking of the diaphragm seal	■ Without ■ Per valid 3-A standard

View all (20)

Logo	Description	Country
	EU declaration of conformity Pressure equipment directive	European Union
®	3-A Sanitary Standard	USA
FEBRUARY 2021 TYPE EL CLASS I	EHEDG 1) Hygienic Equipment Design	European Union
-	CRN Safety (e.g. electr. safety, overpressure, ...)	Canada

Logo	Description	Country
	EAC Pressure equipment directive	Eurasian Economic Community
-	MTSCHS Permission for commissioning	Kazakhstan

Certificates

■ 2.2 test report per EN 10204 - State-of-the-art manufacturing, material proof, 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 - Manufacturer's declaration for food contact materials per regulation (EC) no. 1935/2004 ■ 3.1 inspection certificate per EN 10204 - Material proof, wetted metal parts - Indication accuracy for diaphragm seal systems ■ Manufacturer's declaration for food contact materials per regulation (EC) no. 1935/2004

DN	PN	G	Dimensions in mm[in]
			Pipe outer Ø x wall thickness	L	D₁	D₂	Mb	Aseptic O-ring
25	40	RD 52 x 1/6	29 x 1.5 [1.142 x 0.059]	128 [5.039]	52 [2.047]	63 [2.48]	26 [1.024]	28 x 3.5 [1.102 x 0.138]
32	40	RD 58 x 1/6	35 x 1.5 [1.378 x 0.059]	128 [5.039]	58 [2.283]	70 [2.756]	32 [1.26]	34 x 5 [1.339 x 0.197]
40	40	RD 65 x 1/6	41 x 1.5 [1.614 x 0.059]	160 [6.299]	65 [2.559]	78 [3.071]	38 [1.496]	40 x 5 [1.575 x 0.197]
50	25	RD 78 x 1/6	53 x 1.5 [2.087 x 0.059]	170 [6.693]	78 [3.071]	92 [3.622]	50 [1.969]	52 x 5 [2.047 x 0.197]
65	25	RD 96 x 1/6	70 x 2 [2.756 x 0.079]	182 [7.165]	95 [3.74]	112 [4.409]	66 [2.362]	68 x 5 [2.677 x 0.197]
80	25	RD 110x¼	85 x 2 [3.346 x 0.079]	182 [7.165]	110 [4.331]	127 [5]	81 [3.189]	83 x 5 [3.268 x 0.197]
100	25	RD 130x¼	104 x 2 [4.094 x 0.079]	182 [7.165]	130 [5.118]	148 [5.827]	100 [3.937]	102 x 5 [4.016 x 0.197]

DN	PN	G	Dimensions in mm[in]
			Pipe outer Ø x wall thickness	L	D₁	D₂	Mb	Aseptic O-ring
26.9	40	RD 52 x 1/6	26 x 1.6 [1.024 x 0.059]	128 [5.039]	52 [2.047]	63 [2.48]	23.7 [0.933]	28 x 3.5 [1.102 x 0.138]
33.7	40	RD 58 x 1/6	33.7 x 2 [1.327 x 0.079]	128 [5.039]	58 [2.283]	70 [2.756]	29.7 [1.169]	34 x 5 [1.339 x 0.197]
42.4	25	RD 65 x 1/6	42.4 x 2 [1.669 x 0.079]	160 [6.299]	65 [2.559]	78 [3.071]	38.4 [1.512]	40 x 5 [1.575 x 0.197]
48.3	25	RD 78 x 1/6	48.3 x 2 [1.902 x 0.079]	170 [6.693]	78 [3.071]	92 [3.622]	44.3 [1.744]	52 x 5 [2.047 x 0.197]
60.3	25	RD 96 x 1/6	60.3 x 2 [2.374 x 0.079]	182 [7.165]	95 [3.74]	112 [4.409]	56.3 [2.217]	68 x 5 [2.677 x 0.197]
76.1	25	RD 110x¼	76.1 x 2 [2.996 x 0.079]	182 [7.165]	110 [4.331]	127 [5]	72.1 [2.839]	83 x 5 [3.268 x 0.197]
88.9	25	RD 130x¼	88.9 x 2 [3.5 x 0.079]	182 [7.165]	130 [5.118]	148 [5.827]	84.3 [3.319]	102 x 5 [4.016 x 0.197]

DN	PN	G	Dimensions in mm[in]
			Pipe outer Ø x wall thickness	L	D₁	D₂	Mb	Aseptic O-ring
1"	40	RD 52 x 1/6	25.4 x 1.65 [1 x 0.059]	128 [5.039]	52 [2.047]	63 [2.48]	22.1 [0.87]	24 x 3.5 [0.945 x 0.138]
1 ½"	40	RD 65 x 1/6	42.4 x 1.65 [1.669 x 0.059]	160 [6.299]	65 [2.559]	78 [3.071]	34.8 [1.37]	37 x 5 [1.457 x 0.197]
2"	25	RD 78 x 1/6	48.3 x 1.65 [1.902 x 0.059]	170 [6.693]	78 [3.071]	92 [3.622]	47.5 [1.87]	50 x 5 [1.969 x 0.197]
2 ½"	25	RD 95 x 1/6	60.3 x 1.65 [2.374 x 0.059]	182 [7.165]	95 [3.74]	112 [4.409]	60.2 [2.37]	62 x 5 [2.441 x 0.197]
3"	25	RD 110x¼	76.1 x 1.65 [2.996 x 0.059]	182 [7.165]	110 [4.331]	127 [5]	72.9 [2.87]	75 x 5 [2.953 x 0.197]
4"	25	RD 130x¼	88.9 x 2.11 [3.5 x 0.083]	182 [7.165]	130 [5.118]	148 [5.827]	97.4 [3.835]	100 x 5 [3.937 x 0.197]

DN	PN	Dimensions in mm[in]
		Pipe outer Ø x wall thickness	L	D₁	Mb	Aseptic O-ring
25	25	29 x 1.5 [1.142 x 0.059]	114 [4.489]	70 [2.756]	26 [1.024]	28 x 3.5 [1.102 x 0.138]
32	25	35 x 1.5 [1.378 x 0.059]	-	76 [2.992]	32 [1.26]	34 x 5 [1.339 x 0.197]
40	25	41 x 1.5 [1.614 x 0.059]	-	82 [7.228]	38 [1.496]	40 x 5 [1.575 x 0.197]
50	16	53 x 1.5 [2.087 x 0.059]	156 [6.142]	94 [3.701]	50 [1.969]	52 x 5 [2.047 x 0.197]
65	16	70 x 2 [2.756 x 0.079]	-	113 [4.449]	66 [2.362]	68 x 5 [2.677 x 0.197]
80	16	85 x 2 [3.346 x 0.079]	-	133 [5.236]	81 [3.189]	83 x 5 [3.268 x 0.197]
100	16	104 x 2 [4.094 x 0.079]	-	159 [6.26]	100 [3.937]	102 x 5 [4.016 x 0.197]

DN	PN	Dimensions in mm[in]
		Pipe outer Ø x wall thickness	L	D₁	Mb	Aseptic O-ring
26.9	25	26 x 1.6 [1.024 x 0.059]	-	69 [2.717]	23.7 [0.933]	26 x 3.5 [1.024 x 0.138]
33.7	25	33.7 x 2 [1.327 x 0.079]	114 [4.489]	74 [2.913]	29.7 [1.169]	32 x 5 [1.26 x 0.197]
42.4	16	42.4 x 2 [1.669 x 0.079]	-	82 [3.228]	38.4 [1.512]	40.5 x 5 [1.594 x 0.197]
48.3	16	48.3 x 2 [1.902 x 0.079]	-	88 [3.465]	44.3 [1.744]	46.5 x 5 [1.831 x 0.197]
60.3	16	60.3 x 2 [2.374 x 0.079]	156 [6.142]	103 [4.055]	56.3 [2.217]	58.5 x 5 [2.303 x 0.197]
76.1	16	76.1 x 2 [2.996 x 0.079]	-	125 [4.921]	72.1 [2.839]	73.5 x 5 [2.894 x 0.197]
88.9	16	88.9 x 2 [3.5 x 0.079]	156 [6.142]	137 [5.394]	84.3 [3.319]	86.5 x 5 [3.406 x 0.197]

DN	PN	Dimensions in mm[in]
		Pipe outer Ø x wall thickness	L	D₁	Mb	Aseptic O-ring
1"	25	25.4 x 1.65 [1 x 0.059]	114 [4.489]	50.5 [1.988]	22.1 [0.87]	24 x 3.5 [0.945 x 0.138]
1 ½"	25	42.4 x 1.65 [1.669 x 0.059]	-	64 [2.52]	34.8 [1.37]	37 x 5 [1.457 x 0.197]
2"	16	48.3 x 1.65 [1.902 x 0.059]	-	77.5 [3.051]	47.5 [1.87]	50 x 5 [1.969 x 0.197]
2 ½"	16	60.3 x 1.65 [2.374 x 0.059]	-	91 [3.583]	60.2 [2.37]	62 x 5 [2.441 x 0.197]
3"	16	76.1 x 1.65 [2.996 x 0.059]	-	106 [4.173]	72.9 [2.87]	75 x 5 [2.953 x 0.197]
4"	16	88.9 x 2.11 [3.5 x 0.083]	-	130 [5.118]	97.4 [3.835]	100 x 5 [3.937 x 0.197]

DN	PN	Dimensions in mm[in]
		Pipe outer Ø x wall thickness	L	D₁	Mb	Aseptic O-ring
25	40	29 x 1.5 [1.142 x 0.059]	114 [4.489]	50.5 [1.988]	26 [1.024]	28 x 3.5 [1.102 x 0.138]
32	40	35 x 1.5 [1.378 x 0.059]	-	50.5 [1.988]	32 [1.26]	34 x 5 [1.339 x 0.197]
40	40	41 x 1.5 [1.614 x 0.059]	-	64 [2.52]	38 [1.496]	40 x 5 [1.575 x 0.197]
50	25	53 x 1.5 [2.087 x 0.059]	156 [6.142]	77.5 [3.051]	50 [1.969]	52 x 5 [2.047 x 0.197]
65	25	70 x 2 [2.756 x 0.079]	-	91 [3.583]	66 [2.362]	68 x 5 [2.677 x 0.197]
80	25	85 x 2 [3.346 x 0.079]	-	106 [4.173]	81 [3.189]	83 x 5 [3.268 x 0.197]
100	25	104 x 2 [4.094 x 0.079]	-	130 [5.118]	100 [3.937]	102 x 5 [4.016 x 0.197]

DN	PN	Dimensions in mm[in]
		Pipe outer Ø x wall thickness	L	D₁	Mb	Aseptic O-ring
26.9	40	26 x 1.6 [1.024 x 0.059]	-	50.5 [1.988]	23.7 [0.933]	26 x 3.5 [1.024 x 0.138]
33.7	40	33.7 x 2 [1.327 x 0.079]	-	50.5 [1.988]	29.7 [1.169]	32 x 5 [1.26 x 0.197]
42.4	25	42.4 x 2 [1.669 x 0.079]	-	64 [2.52]	38.4 [1.512]	40.5 x 5 [1.594 x 0.197]
48.3	25	48.3 x 2 [1.902 x 0.079]	-	64 [2.52]	44.3 [1.744]	46.5 x 5 [1.831 x 0.197]
60.3	25	60.3 x 2 [2.374 x 0.079]	-	91 [3.583]	56.3 [2.217]	58.5 x 5 [2.303 x 0.197]
76.1	25	76.1 x 2 [2.996 x 0.079]	-	106 [4.173]	72.1 [2.839]	73.5 x 5 [2.894 x 0.197]
88.9	25	88.9 x 2 [3.5 x 0.079]	-	119 [4.685]	84.3 [3.319]	86.5 x 5 [3.406 x 0.197]

DN	PN	Dimensions in mm[in]
		Pipe outer Ø x wall thickness	L	D₁	Mb	Aseptic O-ring
1"	40	25.4 x 1.65 [1 x 0.059]	114 [4.489]	50.5 [1.988]	22.1 [0.87]	24 x 3.5 [0.945 x 0.138]
1 ½"	40	38.1 x 1.65 [1.5 x 0.059]	-	64 [2.52]	34.8 [1.37]	37 x 5 [1.457 x 0.197]
2"	25	50.8 x 1.65 [2 x 0.059]	-	77.5 [3.051]	47.5 [1.87]	50 x 5 [1.969 x 0.197]
2 ½"	25	63.5 x 1.65 [2.5 x 0.059]	-	91 [3.583]	60.2 [2.37]	62 x 5 [2.441 x 0.197]
3"	25	76.2 x 1.65 [3 x 0.059]	-	106 [4.173]	72.9 [2.87]	75 x 5 [2.953 x 0.197]
4"	25	101.6 x 2.11 [4 x 0.083]	-	130 [5.118]	97.4 [3.835]	100 x 5 [3.937 x 0.197]

Model	Description	Order number
910.16 1)	Instrument mounting bracket form H per DIN 16281, 100 mm, aluminium, black	9091858
	Instrument mounting bracket form H per DIN 16281, 100 mm, stainless steel	9091882
	Instrument mounting bracket for pipe mounting, for pipe Ø20 ...80 mm, electrogalvanised steel	9091904

Material	Unified numbering system (UNS)
Stainless steel 316L (1.4404 or 1.4435)	S31603
Stainless steel 904L (1.4539)	N08904
Stainless steel 321 (1.4541)	S32100
Stainless steel 316Ti (1.4571)	S31635
Stainless steel 1.4466 (urea grade)	S31050
Duplex 2205 (1.4462)	S31803
Superduplex 1.4410	S32750
Tantalum (also lining)	R05200
Hastelloy C276 (2.4819)	N01276
Hastelloy C22 (2.4602)	N06022
Inconel 600 (2.4816)	N06600
Incoloy 825 (2.4858)	N08825
Inconel 625 (2.485)	N06625
Monel 400 (2.4360)	N04400
Nickel 200 (2.4066)	N02200
Nickel 201 (2.4068)	N02201
Titanium 3.7035 (class 2)	R50400
Titanium 3.7235 (class 7)	R52400
Zirconium GR702	R60702

Designation	Identi- fication number	Solidi- fication point	Boiling/ degradation point	Density at 25 °C	Kin.Viscosity at 25 °C	Remark
KN	°C	°C	g/cm³	cSt
Silicone oil	2	-45	+300	0.96	54.5	Universal application
Glycerine	7	-35	+240	1.26	759.6	FDA 21 CFR 182.1320
Silicone oil	17	-90	+200	0.92	4.4	Low temperatures
Halocarbon	21	-60	+175	1.89	10.6	Oxygen 1) and chlorine
Methylcyclopentane	30	-130	+60	0.74	0.7	For very low temperatures
High-temperature silicone oil	32	-25	+400	1.06	47.1	For high temperatures
Neobee® M-20	59	-35	+260	0.92	10.0	FDA 21 CFR 172.856, 21 CFR 174.5
DI water	64	+4	+85	1.00	0.9	For ultrapure media
Silicone oil	68	-75	+250	0.93	10.3
DI water/propanol mixture	75	-30	+60	0.92	3.6	For ultrapure media
Medicinal white mineral oil	92	-15	+260	0.85	45.3	FDA 21 CFR 172.878, 21 CFR 178.3620(a); USP, EP, SP

Maximum temperature	Maximum oxygen pressure
to 60 °C	50 bar
> 60 °C to 100 °C	30 bar
> 100 °C to 175 °C	25 bar