WIKA L990.TC 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

Internal clamped diaphragm with threaded process connection;
requires hydraulic fluid to transmit pressure to instrument

Process Connection

¼” to 1” NPT-female or ¼” to ¾” NPT male

Instrument Connection

¼” or ½” NPT-female
Suitable Pressure Ranges (MWP 2500PSI @250°F)

15 psi to 2500 psi
Available Options (connections, materials, flushing ports, etc.)

See Selection Guide (over)

Diaphragm-Type Diaphragm Seal

Standard Clamped Diaphragm Seal

Type L990.TC

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.TC

(ACS 99.01.T)

Selection Guide - 990.TC

990.TC,1/4X1/4F,CS,CS-0,CS,SS,VI

Notes

1. Includes previous type

990.10.506.

2. Includes previous type

990.10.502.

3. Teflon® lower housing
available in welded 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. Viton® diaphragm is available
for clamped design only.

7. For titanium diaphragm
welded to upper housing, a
titanium upper housing is
required.

8. For Teflon® lower housing and
all welded design (990.10.520)
only. All other lower housings
require gaskets.

9. 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.).

Gasket Material

VI = Viton

BN = Buna “N”

TF = Teflon®, virgin
NA = None (See note 7)

®

Diaphragm Material

SS = 316L stainless steel
MO = Monel® 400
HB = Hastelloy
HC = Hastelloy
PF = 316 stainless steel, Teflon® coated
TF = 316 stainless steel, virgin Teflon® lined
TA = Tantalum

TI = Titanium, grade 2 (See note 6)
NI = Nickel 200
IN = Inconel® 600
IC = Incoloy® 825
CA = Carpenter® 20
VI = Viton® (See note 5)

®

B-2

®

C-276

Clamp & Support Material (Including nuts and bolts)

CS = Carbon Steel, zinc-plated
SS = Stainless steel
NA = None (See note 4)

Flushing Connection (See note 3)

0 = None
1 = 1/8” NPT female
2 = 1/4” NPT female

Lower Housing Material

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 2)

TI = Titanium, grade 2
NI = Nickel 200
IC = Inconel® 800
IC = Incoloy® 825
CA = Carpenter® 20

Upper Housing Material

CS = Carbon steel, nickel-plated
SS = 316 stainless steel

TI = Titanium, grade 2

(See note 8)

Process Connection

1/4F = 1/4” NPT female

Item s in
stock (subject to prior sales).
For optional items, consult
factory for current lead-time.

are avail ab l e from

bold

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

Instrument Connection

1/4 = 1/4” NPT female
1/2 = 1/2” NPT female

Diaphragm Seal Design

Options not listed may be available,

990.TC = Clamped Diaphragm (Pressure rating up to 2500PSI, see note 1)

please consult factory.
Fill Fluid & Mounting options: Please
reference data sheet ACS 99.MO.

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

WIKA Instrument Corporation

1000 Wiegand Boulevard
Lawrenceville, Georgia 30043-5868
Tel: [phone] Fax: [phone]
http://www.wika.com e-mail: [e-mail]