990.34

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WIKA · Pressure measurement · Family 990

Diaphragm seal with threaded connection

Name: Diaphragm seal with threaded connection
Brand: WIKA
SKU: H990.34

Diaphragm seal with threaded connection, welded design for aggressive, hot, corrosive, environmentally hazardous or toxic media.

Range

0…1000 bar

EACCRN

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 pressure transmission medium which is inside the diaphragm seal system.

For the implementation of demanding customer applications, there is a wide variety of designs, materials and pressure transmission mediums available.

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

Special features

Process connection with thread
Version with internal diaphragm, diaphragm seal parts fully welded
Large selection of process connections and materials
Flushing connections optionally available
High pressures up to 1,000 bar [14,500 psi] can be achieved

Identification

Model	990.34
Product family	990
Subcategory	Diaphragm seal

Measuring range

Pressure ranges

0…0.6 bar · 0…1000 bar · 0…8.7 psi · 0…14500 psi

Process conditions

Process connection

1 NPT9/16-18 UNF3/4-16 UNFM20 x 1.5G1AG ½ AG ¼ AG ⅜ AG ¾ AG 1 ½ A½ NPT¼ NPT⅜ NPT¾ NPT1 ½ NPTR ½R ¼R ⅜R ¾G1/2AG1/4AG3/8AG3/4AG11/2AG1/4G3/8G3/4G11/2NPT1/4NPT3/8NPT3/4NPT11/2NPTR1/2R1/4R3/8R3/4R11 1/8-12UNFM16x1.5

Materials

Case material	Stainless steel 1.4404 (316L), Stainless steel 1.4571 (316Ti), Stainless steel 1.4539 (904L), Stainless steel 1.4541 (321), Duplex 2205 (1.4462), Superduplex 2507 (1.4410), Hastelloy C22 (2.4602), Hastelloy C276 (2.4819), Inconel 625 (2.4856), Incoloy 825 (2.4558), Titanium grade 2 (3.7035), Monel 400 (2.4360)
Wetted parts material	Stainless steel 1.4404 (316L), Stainless steel 1.4571 (316Ti), Stainless steel 1.4539 (904L), Stainless steel 1.4541 (321), Duplex 2205 (1.4462), Superduplex 2507 (1.4410), Hastelloy C22 (2.4602), Hastelloy C276 (2.4819), Inconel 625 (2.4856), Incoloy 825 (2.4558), Titanium grade 2 (3.7035), Monel 400 (2.4360)

Certifications and approvals

Certifications

EACCRN

Additional details

Datasheet languages

EN, DE

Tables from datasheet

Model 990.34
Pressure range (see pressure-temperature diagrams from page 4)	0 ... 0.6 bar [0 ... 8.7 psi] to 0 ... 1,000 bar [0 ... 14,500 psi] other units (e.g. psi, kPa) as well as all equivalent vacuum or combined pressure and vacuum ranges are available.
Level of cleanliness of wetted parts	■ Oil and grease free per ASTM G93-03 level FWIKA standard (< 1,000 mg/m 2 ) ■ Oil and grease free per ASTM G93-03 level D and ISO 15001 (< 220 mg/m 2 )
Origin of wetted parts	■ International ■ EU, CH, USA
Connection to the measuring instrument	■ Axial gauge adapter ■ Axial gauge adapter with female threadG½,G¼,½NPTor¼NPT ■ Male thread 9/16-18 UNF
Type of mounting	■ Direct mounting ■ Capillary ■ Cooling element
Flushing connection	■ Without ■ Single flushing connection (G ¼, G⅛, ¼NPT, ⅛NPT) ■ Dual flushing connection (G ¼, G⅛, ¼NPT, ⅛NPT) ■ Plug screws
Design per NACE	■ Without ■ MR0175 ■ MR0103
Vacuum service (see IN 00.25)	■ Basic service ■ Premium service ■ Advanced service
Instrument mounting bracket (only for versions with capillary)	■ Without ■ Form H per DIN 16281, 100 mm, aluminium, black ■ Form H per DIN 16281, 100 mm, stainless steel ■ Bracket for pipe mounting, for pipe outer Ø20 ... 80 mm, steel (see data sheet AC 09.07)

Standard	Male thread	Female thread
Following DIN ISO 228-1	■ G½A ■ G¼A ■ G⅜A ■ G¾A ■ G1A	■ G½ ■ G¼ ■ G⅜ ■ G¾ ■ G1
Following ANSI B 1.20.1	■ ½NPT ■ ¼NPT ■ ⅜NPT ■ ¾NPT ■ 1 NPT ■ 1½NPT	■ ½NPT ■ ¼NPT ■ ⅜NPT ■ ¾NPT ■ 1 NPT
Following ANSI B 1.1	■ 9/16-18 UNF ■ 3/4-16 UNF	■ 9/16-18 UNF ■ 3/4-16 UNF
Following DIN 13-1	■ M20 x 1.5	■ M20 x 1.5
Following ISO 7-1	■ R½ ■ R¼ ■ R⅜ ■ R¾

Material of upper body of diaphragm seal and wetted parts 1)	Nominal pressure (PN) in bar for effective diameter of diaphragm Mb inmm
	PN 160	PN 400	PN 600	PN 1000
Stainless steel 1.4404 (316L)	Mb 52	Mb 40, Mb 29	Mb 22
Stainless steel 1.4571 (316Ti)	Mb 52	Mb 40, Mb 29
Stainless steel 1.4539 (904L)	Mb 52
Stainless steel 1.4541 (321)	Mb 52
Duplex 2205 (1.4462)	Mb 52	Mb 40	Mb 29
Superduplex 2507 (1.4410)	Mb 52
Hastelloy C22 (2.4602)	Mb 52		Mb 29
Hastelloy C276 (2.4819)	Mb 52	Mb 40, Mb 29		Mb 22
Inconel 625 (2.4856)	Mb 52	Mb 40	Mb 29	Mb 22
Incoloy 825 (2.4558)	Mb 52	Mb 40, Mb 29	Mb 22
Monel 400 (2.4360) 2)	Mb 40, Mb 29
Titanium grade 2 (3.7035)	Mb 52	Mb 29

Logo	Description	Country
	EAC (option) Pressure equipment directive	Eurasian Economic Community
-	MTSCHS (option) Permission for commissioning	Kazakhstan
-	CRN Safety (e.g. electr. safety, overpressure, ...)	Canada

View all (15)

G	Dimensions in mm[in]
D	H 1)	h M	SW
G ¼ A	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	13 [0.51]	27 [1.06]
G 3/8 A	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	16 [0.63]	27 [1.06]
G½A	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	20 [0.79]	27 [1.06]
G¾A	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	20 [0.79]	41 [1.61]
G 1 A	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	28 [1.10]	41 [1.61]
¼ NPT	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	13 [0.51]	27 [1.06]
½NPT	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	19 [0.75]	27 [1.06]
¾NPT	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	20 [0.79]	32 [1.26]
1 NPT	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	25 [0.98]	41 [1.61]
M20 x 1.5	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	20 [0.79]	27 [1.06]
R ¼	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	15 [0.59]	27 [1.06]
R½	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	19 [0.75]	27 [1.06]
R 1	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	19 [0.75]	41 [1.61]
1 ⅛ -12 UNF	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	19 [0.75]	41 [1.61]

G	Dimensions in mm[in]
	D	H 1)	h F	SW
G ¼	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	13 [0.51]	27 [1.06]
G 3/8	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	16 [0.63]	27 [1.06]
G½	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	19 [0.75]	27 [1.06]
G¾	64 [2.52]	62.5 ... 83.5 [2.46 ... 3.29]	24 [0.94]	32 [1.26]
¼ NPT	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	13 [0.51]	27 [1.06]
½NPT	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	19 [0.75]	27 [1.06]
¾NPT	64 [2.52]	54.5 ... 75.5 [2.15 ... 2.93]	22 [0.87]	32 [1.26]
1 NPT	64 [2.52]	68.5 ... 89.5 [2.70 ... 3.52]	26 [1.02]	46 [1.81]

G	Dimensions in mm[in]
	D	H 1)	h M
G ¼ A	54 [2.13]	48 ... 66 [1.89 ... 2.60]	13 [0.51]
G 3/8 A	54 [2.13]	48 ... 66 [1.89 ... 2.60]	16 [0.63]
G½A	54 [2.13]	48 ... 66 [1.89 ... 2.60]	20 [0.79]
G¾A	54 [2.13]	48 ... 66 [1.89 ... 2.60]	20 [0.79]
G 1 A	54 [2.13]	48 ... 66 [1.89 ... 2.60]	28 [1.10]
¼ NPT	54 [2.13]	48 ... 66 [1.89 ... 2.60]	13 [0.51]
½NPT	54 [2.13]	48 ... 66 [1.89 ... 2.60]	19 [0.75]
¾NPT	54 [2.13]	48 ... 66 [1.89 ... 2.60]	20 [0.79]
1 NPT	54 [2.13]	48 ... 66 [1.89 ... 2.60]	25 [0.98]
M20 x 1.5	54 [2.13]	48 ... 66 [1.89 ... 2.60]	20 [0.79]
R ¼	54 [2.13]	48 ... 66 [1.89 ... 2.60]	15 [0.59]
R½	54 [2.13]	48 ... 66 [1.89 ... 2.60]	19 [0.75]

G	Dimensions in mm[in]
	D	H 1)	h F
G ¼	54 [2.13]	51 ... 69 [2.01 ... 2.72]	13 [0.51]
G½	54 [2.13]	51 ... 69 [2.01 ... 2.72]	19 [0.75]
¼ NPT	54 [2.13]	51 ... 69 [2.01 ... 2.72]	13 [0.51]
½NPT	54 [2.13]	51 ... 69 [2.01 ... 2.72]	19 [0.75]
9/16-18 UNF	54 [2.13]	53 ... 71 [2.09 ... 2.76]	11.2 [0.44]

G	Dimensions in mm[in]
	D	H 1)	h M
G ¼ A	40 [1.57]	46 ... 65 [1.81 ... 2.56]	13 [0.51]
G½A	40 [1.57]	46 ... 65 [1.81 ... 2.56]	20 [0.79]
G 1 A	40 [1.57]	46 ... 65 [1.81 ... 2.56]	28 [1.10]
¼ NPT	40 [1.57]	46 ... 65 [1.81 ... 2.56]	13 [0.51]
½NPT	40 [1.57]	46 ... 65 [1.81 ... 2.56]	19 [0.75]
1 NPT	40 [1.57]	46 ... 65 [1.81 ... 2.56]	25 [0.98]
M20 x 1.5	40 [1.57]	46 ... 65 [1.81 ... 2.56]	20 [0.79]
R ¼	40 [1.57]	46 ... 65 [1.81 ... 2.56]	15 [0.59]
R½	40 [1.57]	46 ... 65 [1.81 ... 2.56]	19 [0.75]

G	Dimensions in mm[in]
	D	H 1)	h F
G ¼	40 [1.57]	46 ... 65 [1.81 ... 2.56]	13 [0.51]
G½	40 [1.57]	51 ... 70 [2.01 ... 2.76]	19 [0.75]
¼ NPT	40 [1.57]	46 ... 65 [1.81 ... 2.56]	13 [0.51]
½NPT	40 [1.57]	46 ... 65 [1.81 ... 2.56]	19 [0.75]
M16 x 1.5	40 [1.57]	51 ... 70 [2.01 ... 2.76]	12 [0.47]
3/4-16 UNF	40 [1.57]	51 ... 70 [2.01 ... 2.76]	15.7 [0.62]

G	Dimensions in mm[in]
	D	H 1)	h M
G ¼ A	34 [1.34]	36 ... 64 [1.42 ... 2.52]	13 [0.51]
G½A	34 [1.34]	36 ... 64 [1.42 ... 2.52]	20 [0.79]
G¾A	34 [1.34]	36 ... 64 [1.42 ... 2.52]	20 [0.79]
¼ NPT	34 [1.34]	36 ... 64 [1.42 ... 2.52]	13 [0.51]
½NPT	34 [1.34]	36 ... 64 [1.42 ... 2.52]	19 [0.75]
M20 x 1.5	34 [1.34]	36 ... 64 [1.42 ... 2.52]	20 [0.79]
9/16-18 UNF	34 [1.34]	2)	2)
3/4-16 UNF	34 [1.34]	2)	2)

G	Dimensions in mm[in]
	D	H 1)	h F
G ¼	34 [1.34]	2)	13 [0.51]
G½	34 [1.34]	2)	19 [0.75]
¼ NPT	34 [1.34]	2)	13 [0.51]
½NPT	34 [1.34]	41 ... 69 [1.61 ... 2.72]	19 [0.75]
M16 x 1.5	34 [1.34]	41 ... 69 [1.61 ... 2.72]	12 [0.47]
9/16-18 UNF	34 [1.34]	41 ... 69 [1.61 ... 2.72]	11.2 [0.44]
3/4-16 UNF	34 [1.34]	41 ... 69 [1.61 ... 2.72]	15.7 [0.62]

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

Diaphragm seal with threaded connection

Description

Special features

1 standard articles of family 990