Wika Diaphragm Pressure Gauge ( Model: 432.50, 433.50 )

Zebco Engineering is an authorized supplier of WIKA Differential Pressure Gauges (Models: 700.01, 700.02) in India, providing reliable performance and accuracy for a wide range of industrial uses.

Special Features

Shop Datasheet

Case and wetted parts from stainless steel
Wide choice of special materials
High overload safety up to the 10-fold full scale value
Process connection thread or open flange
Scale ranges from 0 … 16 mbar

Application

For measuring points with increased overload

With liquid-filled case suitability for high dynamic pressure loads and vibrations (model 433.50)

For gaseous, liquid and aggressive media, also in aggressive environments

With the open connecting flange also suitable for contaminated and viscous media

Process industry: Chemical, petrochemical, power plants, mining, on-/offshore, environmental technology, machine building and general plant construction

Descriptions

Diaphragm pressure gauges are preferably used for low pressure ranges. Through the large working surface of the circular, corrugated diaphragm element, small pressure ranges can be measured reliably.

The model 432.50 diaphragm pressure gauge is manufactured in accordance with EN 837-3. The high-quality design is particularly suitable for applications in the chemical and petrochemical industry, oil and gas industry and power engineering. The case and wetted parts from stainless steel fulfil high requirements for resistance against aggressive media. For especially high resistance requirements, the pressure chamber of this diaphragm pressure gauge can be designed with a wide variety of special materials such as PTFE, tantalum or Hastelloy. 

For the measurement of highly viscous, crystallising or contaminated media, the use of an open connecting flange is recommended. The open connecting flange has the advantage over a threaded connection that the pressure port cannot become blocked. With an additional flushing bore on the open connecting flange, the pressure chamber can be easily cleaned. 

Measuring systems with diaphragm elements, on the grounds of their design, offer good protection from overpressure, since the diaphragm can support itself against the upper flange. As standard, the model 432.50 diaphragm pressure gauge already features an overload safety of 5 times the full scale value. Versions with higher overload safeties can be realised.

Functionality

Diaphragm elements are circular, corrugated diaphragms. They are clamped together at the edge between two flanges and are subjected to the pressure on one side by the pressure in the media chamber. The resulting deflection is transmitted to the movement via the link and displayed on the dial with the instrument pointer.

Overload safety

Diaphragm elements have a relatively large actuating force and, due to the annular clamping of the element, they are less sensitive to vibration in comparison with Bourdon tubes. Diaphragm elements can be subject to higher overload of up to 10 times the full scale value, up to a max. of 40 bar, through load take-up points (by bringing the diaphragm element up against the upper measuring flange). With a scale range of 0 ... 4 bar and 10-fold overload safety, a short-term overpressure of up to40 bar is not problematic, as the accuracy is not affected.

Versions for special media

Larger pressure ports, open connecting flanges and purging options can be integrated for measuring highly viscous, contaminated or crystallising media.

Coating / Lining of wetted parts

By selecting a coating / lining for the wetted parts, the instrument can also be used for extremely corrosive media. The materials suitable for this can either be selected for the diaphragm element only, or together with the process connection with lower measuring connection in a freely combinable manner. The selection of the material combination determines whether it is self-sealing or implemented with a sealing.

Specifications

Basic information	-
Standard	-
Diaphragm and capsule pressure gauges	EN 837-3
	→ For information on the “Selection, installation, handling and operation of pressure gauges”, see Technical information IN 00.05.
Nominal size (NS)	Ø 100 mm [4] Ø 160 mm [6]
Window	Laminated safety glass
CASE	-
Design, models 432.50 and 433.50	Safety level “S1” per EN 837-1: With blow-out device
Design, models 432.30 and 433.30	Safety level “S3” per EN 837-1: With solid baffle wall and blow-out back
Material	Stainless steel 1.4301 (304) Stainless steel 1.4571 (316 Ti)
Case filling	Without Glycerine-water mixture 1) Silicone oil M50 1)
Movement	Stainless steel