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SIL-certified: Functional safety with mechanical switches

Mechanical pressure and temperature switches perform sensitive tasks in safety-relevant applications, e.g. monitoring limit values. Their functional safety must be guaranteed accordingly. That is always the case if the instruments fulfil the requirements of the corresponding safety integrity level (SIL) in accordance with the IEC 61508 standard. WIKA switches have been issued SIL approval because …

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What advantages does a cable box have for submersible pressure sensors?

A cable box for submersible pressure sensors for level detection is an inconspicuous and simple accessory. With its help, the installation costs for certain measuring locations can be significantly reduced.Submersible pressure sensors measure the hydrostatic pressure of a liquid, from which the level in a vessel or open container is calculated. The pressure sensors, therefore, …

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Economical monitoring of flows using a calorimetric flow switch

Anyone who has dealt with the topic of flow measurement will know that a corresponding measuring instrument costs several thousand euros. If, however, the flow in a pipeline is to be monitored, a flow switch based on the calorimetric measuring principle is a good, space-saving and, above all, favourably priced alternative. So how do flow …

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Responsible handling of sulphur hexafluoride

Sulphur hexafluoride – or SF6 gas for short – is, so far, the gas with the strongest known greenhouse effect. Its contribution to the greenhouse effect is about 23,000 times that of CO2 and is persistent in the atmosphere.Source: Federal Statistical Office: Survey of particular climate-active materials “sulphur hexafluoride” (SF6), Wiesbaden, 2015Sulphur hexafluoride is defined …

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Selection criteria for the prevention of moisture-related failures of submersible pressure transmitters or level probes

pressure gauge 10 bar as well known as level probes are intended to be used in immersion applications, thus they are immersed completely into the medium and, therefore, must withstand the properties of the media at all times.Both in water and wastewater treatment as well as in tank monitoring, moisture may enter through the housing …

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Ex protection for dial thermometers: New standard = new marking

Mechanical measuring instruments for use in explosive atmospheres is now able to be evaluated in accordance with a new standard: DIN EN ISO 80079-36/37 will replace EN 13463-1/5, with the transition period ending on 31 October 2019. For the initial instruments, WIKA has classified the model 73 and model 74 gas-actuated thermometers in accordance with …

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Pressure equipment directive 97/23/EC PED – Pressure limits 0.5 bar and 200 bar for pressure sensors and pressure transmitters

In connection with the pressure equipment directive 97/23/EC (PED), a pressure limit of 200 bar is often mentioned. But what does this limit mean for manufacturers and/or companies that place pressure sensors, pressure transmitters and pressure equipment on the market? Generally diaphragm seal can be said that, depending on the type of medium to be …

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เพรสเชอร์เกิจ , Pt1000 and NTC are the most-used measuring elements in resistance thermometers. I would like to use this blog to consider the question of connection types in greater detail. diaphragm seal change their electrical resistance as a function of temperature. This physical effect makes it possible to measure the temperature of a process with …

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