Absolute Pressure Measuring Capsules

Absolute pressure measuring capsules, or absolute pressure capsules, are evacuated capsules for use in aneroid barometers and altimeters. The spring action of the diaphragms and the load of the external air pressure are in equilibrium. A change in air pressure thus causes a corresponding change in the height of the capsule. The change in capsule height is transmitted via a pointer mechanism to the display of a barometer or altimeter. If the stroke is insufficient, several absolute pressure capsules can be assembled into a capsule stack.

Absolute pressure measuring capsules are evacuated and hermetically sealed and are used for air pressure and altitude measurement.

Diaphragm Springs or Pressure Measuring Capsules

We supply absolute pressure measuring capsules and capsule stacks in various diameters and strokes, and with silver vapor deposition if desired. For use in weather stations, we also manufacture temperature-compensated capsule stacks.

Differential Pressure Measuring Capsules

Differential pressure measuring capsules, relative pressure measuring capsules, or diaphragm springs measure the pressure outside the assembly relative to the internal pressure of the assembly.

For differential pressure capsules, two diaphragms are connected to allow for larger strokes. The measuring pressure is fed into the differential pressure capsule via a pressure connection. The height of the differential pressure capsule changes with the pressure difference between the internal and external pressure. We manufacture differential pressure measuring capsules from CuBe2, 1.4435, and 1.4571 in various diameters. Other materials and diameters are available upon request. Customized connections can be manufactured at favorable prices upon request.

Function of Differential Pressure Measuring Capsules, Relative Pressure Measuring Capsules, or Diaphragm Springs

It functions like an analog computer, as any pressure applied equally to both sides of the capsule results in a zero deflection.

Diaphragms, Flat Springs or Disc Springs

Diaphragms, flat springs, or disc springs are primarily used when, for example, very hot or highly corrosive processes do not allow direct connection of pressure gauges to the process medium.

Diaphragms or disc springs are our basic elements for pressure measurement. They can be described as pressure-stroke transducers. Two diaphragms connected at the edge form a differential or absolute pressure measuring cell. Isolation diaphragms are usually used as pressure transmitters between the medium and the sensor element. Areas of application are mostly pressure gauges, pressure transducers, and blood pressure monitors.

These applications require very good linearity. We guarantee linearity errors of less than 1% F.S., and even less upon request. In many applications, linearity is not required, but the stroke is optimized. For example, for applications in pressure regulators, pressure surge dampers, or pressure indicators. Contact us with your task. Hysteresis is practically immeasurable for many materials. For many customers, the diaphragms are connected with fittings, nipples, or base plates.

Applications of Diaphragms or Flat Springs

Diaphragm seals
Pressure gauges
Blood pressure monitors
Manometers
Sensors

Diaphragms are available in various highly resistant materials and different designs to ensure compatibility with a variety of pressure measuring devices.

We manufacture metal diaphragms from the materials

1.4435
1.4571
C 75
Duratherm 600
Nickel-Beryllium
Copper-Beryllium
Hastelloy C276
in diameters from 10 to 137 mm

Diaphragm Systems

Diaphragm systems are suitable for the measurement of micro-pressure and negative pressure of gaseous media in all types of processes, even with high demands on corrosion resistance.

Adapted to your specific requirements, we develop entirely new diaphragm systems or base them on drawings or existing samples.
We can adapt these systems to the desired pressure and precision range, including vacuum and vacuum-pressure ranges.