RoHS marking and certificates

I am often asked, “How is a RoHS marking actually carried out?” The quick answer: EU RoHS will, from 22nd July 2017, be visible in the CE marking and the declaration of conformity linked to it. China RoHS conformant instruments carry a green logo. Non-conformant instruments in accordance with China RoHS carry an orange logo … Read more

Reed level sensor: Defining the measuring range flexibly

A float-based level sensor with a reed chain is really a widely used and comparatively economical solution for continuous level measurement in vessels. Feast can define its measuring range flexibly inside a given range. This short article describes what should be taken into account.With a reed-chain level sensor, the guide tube contains a defined amount … Read more

Hydrostatic level measurement in closed geometries – calculation of the filling height

In a previous blog post, I explained the calculation of the filling height in open geometries and vessels. Unlike open vessels, the calculation of level in closed geometries, such as gas-tight tanks or pressurised vessels, requires a compensation of the pressure of the gas enclosed above the liquid with the hydrostatic pressure measurement.Level measurement in … Read more

Signal clamping in pressure transmitters

In certain applications, the current or voltage signal of a pressure transmitter should never exceed and/or drop below a crucial value. This is often ensured with the aid of so-called signal limiting.Why is Greatest clamping necessary in the first place?If the pressure on a pressure transmitter lies within the nominal pressure range, then you will … Read more

How does a pressure sensor behave in the overload area, that means outside the measuring range?

I have often been asked about the behaviour of a pressure sensor outside the specified measuring range, that means in the overload area and what will happen if the overload limit of a pressure sensor is exceeded. This fact is described as follows in the book “Electronic pressure measurement”:“Pressures within the overpressure range will not … Read more

Filling liquids in pressure gauges: Usage and advantages

Liquid-filled pressure gauges are employed in applications that involve high dynamic shock and vibration loading. The filling liquid dampens the vibrations that occur and thus takes the load off the mechanical components of the pressure gauge.Pressure gauge with filling liquid ? model 213.53Use of filling liquidsDepending on the operating conditions, glycerine-water mixtures or silicone oils … Read more

What does maximum operating pressure or working pressure mean with pressure sensors?

Our customers like to talk about a maximum operating pressure or working pressure. Unfortunately, these two terms are not defined for pressure sensors, which means that a definitive answer cannot be given. All we can assume is that, by maximum operating pressure or working pressure, the maximum pressure that can occur under normal operating/working conditions … Read more

Level sensors ? the agony of choice?

If one is looking for a level sensor, one can be quickly overwhelmed by the huge selection. An even sensor for limit level detection or continuous measurement could be ordered in a variety of technologies and design variants. But how do I find the appropriate level sensor for my application?If one really wants to select … Read more