WIKA L990.10 Specifications

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

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)

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WIKA Datasheet L990.10 · 05/2008