PMC 71 in DP Level Measurement in MMA
Acid Stripper Columns- Chemical
Cerabar S PMC 71 Ceraphire™ ceramic pressure transmitters
handle highly corrosive chemicals
Acid storage tanks
Cerabar S PMC 71 with flange
Typical chemical plant
Ceramic pressure transmitters replace
expensive remote seals in DP level
applications.
capillary connections, causing safety hazards and unscheduled process down-time.
to choose from, the Cerabar S PMC71 can
be customized for almost any application.
Customer profile
Solution
Results
The customer removed the previous metal
diaphragm remote seal DP transmitter and
installed two PMC71 Ceraphire ceramic
diaphragm pressure transmitters made
with zirconium metal flanges and Kalrez™
O-rings. The customer installed the PMC71
transmitters in the same process connections once used for the DP transmitter
remote seals. The differential pressure level
measurement is now made electronically in
the DCS.
The two PMC71 transmitters provide
accurate pressure measurements for the
calculation of DP level. In addition, the
Ceraphire ceramic sensors in the PMC71
are completely impervious to the corrosive
chemicals in the MMA reaction vessel. This
provides several benefits to the customer:
1. Cost savings from not having to
replace DP transmitters with
expensive zirconium remote seals
every six months as preventative
maintenance.
2. Enhanced process safety through the
removal of “dumb” remote seals
which are incapable of detecting a
leak in the process diaphragm.
3. Increased process up-time since the
PMC71 ceramic transmitters don’t
require routine maintenance or
replacement.
4. Faster response time to changes in
level since the long oil-filled
capillaries have been eliminated.
A major producer of Methyl Methacrylate
(MMA).
Application description
Measuring DP level in acid stripper columns in the MMA production process.
Process material: highly corrosive
chemical mixture
Temperature:
248°F (120°C)
Static pressure:
0 to 30 psia
Column height:
25 feet
Application challenges
The customer previously used differential
pressure transmitters with metal diaphragm
remote seals to measure level. Due to
the extremely corrosive properties of the
chemicals in the reaction vessel, the remote
seal flanges were machined completely out
of zirconium to withstand the application.
Even with zirconium all-wetted parts, the
remote seals still had to be replaced every
six months as preventative maintenance
against pitting and corrosion of the thin
metal diaphragms. Occasionally the corrosive chemicals permeated the pressure
diaphragms and leaked out through the
CS0274/24/ae
Instrument description
The Cerabar S PMC71 with Ceraphire
ceramic diaphragm technology provides
highly accurate and stable pressure
measurements in difficult gage or absolute
pressure applications. The dry (no fill fluid)
ceramic sensor accurately measures deep
vacuums at elevated temperatures without
damage to the diaphragm. The Ceraphire
ceramic material used in the sensor is
99.9% pure aluminum oxide (Al2O3) for
best-in-class chemical compatibility. The
physical durability of the ceramic sensor makes it ideal for abrasive slurries or
applications requiring frequent cleaning of
buildup on the diaphragm. With a wide
variety of process connections and materials
For more information, contact
Endress+Hauser, Inc.
317-535-7138
www.us.endress.com
ISO 9001:2000 Certified
USA
Canada
Mexico
Endress+Hauser, Inc.
2350 Endress Place
Greenwood, IN 46143
Tel. 317-535-7138
Sales 888-ENDRESS
Service 800-642-8737
Fax 317-535-8498
[email protected]
www.us.endress.com
Endress+Hauser, Canada
1075 Sutton Drive
Burlington, ON L7L 5Z8
Tel. 905-681-9292
800-668-3199
Fax 905-681-9444
[email protected]
www.ca.endress.com
Endress+Hauser México, S.A. de C.V.
Fernando Montes de Oca 21 Edificio A Piso 3
Fracc. Industrial San Nicolás
54030. Tlalnepantla de Baz
Estado de México
México
Tel. +52 55 5321 2080
Fax +52 55 5321 2099
[email protected]
www.mx.endress
CS0274/24/ae/07.08