WIKA L990.34 Specifications
Diaphragm Seals
Application
Process industry diaphragm seal to combine with Bourdon tube
pressure gauges. Intended for corrosive, contaminated, hot or
viscous pressure media.
Design
Upper and lower housing welded with Internal welded diaphragm,
threaded process connection; requires hydraulic fluid to transmit
pressure to instrument
Process Connection
¼” NPT to 1” NPT
Instrument Connection
Capillary, ¼” or ½” NPT-female
Suitable Pressure Ranges
2 ½” Gauge: 100PSI to 9000PSI
4 and 4 ½” Gauge: 400PSI to 9000PSI
Diaphragm-Type Diaphragm Seal
All Welded Diaphragm Threaded Diaphragm Seal
Type L990.34
Available Options (connections, materials, flushing ports, etc.)
See Selection Guide (over)
To determine the effects of temperature and response time in a
specific application, contact the factory for an Application
Questionnaire. The information provided will allow WIKA Technical
Support to accurately model your application parameters using stateof-the-art computer simulation techniques.
ACS L990.34
(ACS 99.12)
Selection Guide - L990.34
L990.34,1/4X1/4F-0,SS,SS,SS
Notes
1. Customer to supply
flushing plug.
2. Upper housing, diaphragm and
lower housing must be the same
material.
Items in
bold
stock (subject to prior sales).
For optional items, consult
factory for current lead-time.
are av ail able from
Instrument Connection
1/4 = 1/4” NPT female
1/2 = 1/2” NPT female
CPL = Capillary connection (To weld capillary directly to seal)
Diaphragm Seal Design (Pressure rating – 9,000PSI)
L990.34 = All Welded Design
Diaphragm Material
SS = 316 stainless steel
MO = Monel® 400 (See note 2)
HC = Hastelloy® C-276
Lower Housing Material
SS = 316 stainless steel
MO = Monel® 400 (See note 2)
HC = Hastelloy® C-276
Upper Housing Material
SS = 316 stainless steel
MO = Monel® 400 (See note 2)
HC = Hastelloy® C-276
Flushing Connection (See note 1)
0 = None
1 = 1/8” NPT female
2 = 1/4” NPT female
Process Connection
1/4F = 1/4” NPT female
1/2F = 1/2” NPT female
1/4M = 1/4” NPT male
1/2M = 1/2” NPT male
3/4M = 3/4” NPT male
1.0M = 1” NPT male
Options not listed may be available, please consult factory.
Fill Fluid & Mounting options: Please reference data sheet ACS 99.MO
THE MEASURE OF
Total Performance
Ordering Information:
State computer part number (if available) / type number / size /
range / connection size and location / options required.
Specifications given in this price list represent the state of engineering at the time of printing.
Modifications may take place and the specified materials may change without prior notice
05/01
TM
WIKA Instrument Corporation
1000 Wiegand Boulevard
Lawrenceville, Georgia 30043-5868
Tel: 770-513-8200 Fax: 770-338-5118
http://www.wika.com e-mail: chemseal@wika.com
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