Page 1
Diaphragm - Type Diaphragm Seal
Type L990.10 - Standard Welded Diaphragm Seal
Applications
Process industry diaphragm seal to combine bourdon tube
pressure gauges. Intended for corrosive, contaminated, hot
or viscous pressure media.
Features
Multi-purpose diaphragm seal
Threaded process connection
Diaphragm welded to upper housing
Design
Diaphragm Seals
WIKA Datasheet L990.10
The diaphragm is welded to the upper housing which allows
the replacement of the lower housing without jeopardizing
the integrity of the system fill fluid and installed instrument.
The upper and lower housing are bolted together and sealed
by use of an O-ring. Process wetted components can be
manufactured with solid metallic and nonmetallic materials.
Pressure Rating,
Maximum
Suitable Pressure Span,
Minimum2:
Gauge (Range
4” or 4½”, > 15 psi
Pressure Transmitters
(TRONIC)
Operating Temperature
1
: 3,675 psi
3
): 2½”, > 15 psi
4
: > 15 psi
5
: -130°F to 752°F (-90°C to 400°C)
Standard Welded Diaphragm Seal Model L990.10
WIKA Datasheet L990.10 · 05/2008
Page 1 of 4
Page 2
L990.10 Smart Codes for Custom Order Configurations
Field No. Code Feature
Process Connection
GN2 1/4 NPT Female
GN4 1/2 NPT Female
GN5 3/4 NPT Female
GN6 1 NPT Female
GNB 1/4 NPT Male
GND 1/2 NPT Male
GNE 3/4 NPT Male
GNF 1.0 NPT Male
1 ??? Other - Please Specify
Nominal Pressure Rating
XA 200 psi MWP (Maximum 300 °F)
XB 1500 psi MWP (Standard 4 bolts)
XT 3675 psi
2 ?? Other - Please Specify
Upper Housing Material
AP Carbon Steel 1018 Nickel Plated
A2 Stainless Steel 316L (1.4435)
A1 Stainless Steel 316TI (1.4571)
AE Titanium Grade 2 (3.7035)
3 ?? Other - Please Specify
Diaphragm Material
A2 Stainless Steel 316L (1.4435)
A5 Hastelloy B2 (2.4617)
A7 Hastelloy C276 (2.4819)
A8 Monel 400 (2.4360)
A9 Inconel 600 (2.4816 )
AA Incoloy 825 (2.4858)
AB Tantalum
AC Nickel 200 (2.4066)
AE Titanium Grade 2 (3.7035) Upper Titanium required
C2 Carpenter 20
AG Stainless Steel 316TI (1.4571) with PTFE-foil
BB Stainless Steel 316L with PFA-coating
BD Stainless Steel 316TI (1.4571) with Gold Lining 25 µm
4 ?? Other - Please Specify
Lower Housing Material
AP Carbon Steel 1018 Nickel Plating
A1 Stainless Steel 316TI (1.4571)
A2 Stainless Steel 316L (1.4435)
A5 Hastelloy B2 (2.4617)
A7 Hastelloy C276 (2.4819)
A8 Monel 400 (2.4360)
A9 Inconel 600 (2.4816)
AA Incoloy 825 (2.4858)
5 AE Titanium Grade 2 (3.7035)
Page 2 of 4
WIKA Datasheet L990.10 · 05/2008
Page 3
L990.10 Smart Codes for Custom Order Configurations cont’d
Field No. Code Feature
Lower Housing Material (continued)
1)
AN Solid Teflon (PTFE)
C2 Carpenter 20
5 ?? Other - Please Specify
Fastening Parts
A Retainer Flange and Bolts in Galvanized Steel
B Retainer Flange and Bolts in Stainless Steel
6 C Retainer Flange Stainless Steel and High Tensile Bolts
Gasket (Process Seal)
Z Without
G BUNA-N (NBR) Max. 212°F
J Viton (FPM) Max. 400°F
E Teflon (PTFE) Max. 500°F
C Metal Seal Form C, Stainless Steel / Silver
D Metal Seal Form C, Inconel / Silver
7 ? Other - Please Specify
Connection to the Pressure Instrument
3 1/2 NPT Female
4 1/4 NPT Female
5 Axial Weld-in Connection
8 ? Other - Please Specify
Flushing Connection
1 Without
2 1 x 1/8 NPT
3 1 x 1/4 NPT
4 2 x 1/8 NPT
5 2 x 1/4 NPT
9 ? Other - Please Specify
System Fillport
A Without
C Filler Hole M6 Set Screw
10 ? Other - Please Specify
Quality Certificates
Z Without
11 1 Quality Certificates
Additional Order Details
Z Without
12 T Additional Order Details
MWP 200 psi
Note: 1) NO Flushing ports available.
2)
Lot charges for annealing apply
Order Code:
1 2 3 4 5 6 7 8 9 10 11 12*
L990.10 - -
*Additional order details
Page 3 of 4WIKA Datasheet L990.10 · 05/2008
Page 4
Description Ordering Code - L990.10
Gasket Material (See note 10)
VI = Viton
BN = Buna “N”
TF = Teflon®, virgin
AS = Stainless steel, silver-plated
NA = None (See note 9)
Diaphragm Material
SS = 316L stainless steel
MO = Monel
HB = Hastelloy® B-2
Notes
1. Includes previous type 990.10.502.
2. Capillary connection requires a stainless steel
upper housing.
3. Teflon
diaphragm (type 990.10.501) design only. (MWP
200 psi@ 200°F) Available with 1/4" or 1/2" NPT
female process connections only.
4. Customer to supply flushing plug.
5. For all welded design (990.10.520) only.
6. Nuts and bolts only. Clamp rings, support
ring and washers are 316 stainless steel.
Requires silver-plated stainless steel gasket.
7. Viton
design only.
8. For titanium diaphragm welded to upper
housing, a titanium upper housing is required.
9. For Teflon® lower housing and all welded
design (990.10.520) only. All other lower
housings require gaskets.
10. Standard material for stainless steel and
carbon steel wetted parts is Viton® (400°F max.).
Teflon® is standard for all other wetted parts
(500°F max.). Silver-plated stainless steel gasket
is used for high temperature applications (752°F
max.).
HC = Hastelloy® C-276
PF = 316 stainless steel, Teflon® coated
TF = 316 stainless steel, virgin Teflon® lined
TA = Tantalum
TI = Titanium, grade 2 (See note 8)
NI = Nickel 200
IN = Inconel® 600
IC = Incoloy® 825
®
lower housing available in welded
CA = Carpenter® 20
SA = 316 stainless steel, gold-plated
VI = Viton® (See note 7)
CS = Carbon Steel, zinc-plated
SS = Stainless steel
HS = High temperature stainless steel (See note 6)
NA = None (See note 5)
0 = None
1 = 1/8” NPT female
®
diaphragm is available for clamped
2 = 1/4” NPT female
CS = Carbon steel, nickel-plated
SS = 316 stainless steel
MO = Monel® 400
HB = Hastelloy® B-2
HC = Hastelloy® C-276
TF = Teflon®, virgin (See note 3)
TI = Titanium, grade 2
NI = Nickel 200
IC = Inconel® 800
IC = Incoloy® 825
CA = Carpenter® 20
CS = Carbon steel, nickel-plated
SS = 316 stainless steel
TI = Titanium, grade 2
L990.10,1/4X1/4F,CS,CS-0,CS,SS,VI
Clamp & Support Material (Including nuts and bolts)
Flushing Connection (See note 4)
Lower Housing Material
Upper Housing Material
®
®
400
1/4F = 1/4” NPT female
1/2F = 1/2” NPT female
3/4F = 3/4” NPT female
1.0F = 1” NPT female
1/4M = 1/4” NPT male
1/2M = 1/2” NPT male
3/4M = 3/4” NPT male
Process Connection
Instrument Connection
1/4 = 1/4” NPT female
1/2 = 1/2” NPT female
CPL = Capillary connection (To weld capillary directly to seal, see note 2)
Diaphragm Seal Design
L990.10 = Welded Diaphragm (Pressure rating up to 3675PSI, see note 1)
Page 4 of 4
Ordering information
Pressure gauge model / Nominal size / Scale range / Size of connection / Optional extras required
Specifications and dimensions given in this leaflet represent the state of engineering at the time of printing.
Modifications may take place and materials specified may be replaced by others without prior notice.
WIKA Datasheet L990.10 · 05/2008
WIKA Instrument Corporation
1000 Wiegand Boulevard
Lawrenceville, GA 30043
Tel (770) 513-8200 Toll-free 1-888-WIKA-USA
Fax (770) 338-5118
E-Mail info@wika.com
www.wika.com
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