422.12 / 423.12 Diaphragm Pressure Gauge

The application areas for the WIKA 422.12 / 423.12 gauges with diaphragm pressure elements are gaseous and liquid aggressive media. Instruments with open connecting flanges are even suitable for highly viscous and contaminated media, also in aggressive ambience. Typical scale ranges are from 0 … 16 mbar to 0 … 40 bar.

Dependant upon the pressure range and the instrument model, overpressure safety of 3 x or 5 x full-scale value is possible as standard. For unique designs, an overpressure safety of 10, 40, 100 or 400 bar is possible, with the measuring accuracy maintained. Liquid filling the case ensures a precise instrument display, even with high dynamic pressure loads and vibrations. Special wetted parts materials are available as options.

The WIKA 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 WIKA diaphragm pressure gauges are manufactured in accordance with EN 837-3. The robust design is particularly suitable for applications in machine building, plant construction and in the water and wastewater industry.

The upper measuring flange with case and the lower measuring flange are made from one cast part, respectively. The WIKA instrument is used for the measurement of gaseous and liquid media that will not attack cast steel.

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 connection 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 overload, since the diaphragm can support itself against the upper flange. As standard, the diaphragm pressure gauges already feature an overload safety of 3 times the full scale value. Optionally, higher overload safeties can be realised.