{"id":8069,"date":"2018-02-02T09:00:23","date_gmt":"2018-02-02T08:00:23","guid":{"rendered":"https:\/\/blog.wika.com\/en\/?p=8069"},"modified":"2021-08-26T08:08:02","modified_gmt":"2021-08-26T06:08:02","slug":"how-does-one-specify-the-switch-point-of-a-float-switch","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/en\/products\/level-products\/how-does-one-specify-the-switch-point-of-a-float-switch\/","title":{"rendered":"How does one specify the switch point of a float switch?"},"content":{"rendered":"

In the specification of the switch points\u00a0of a float switch, misunderstandings always lead to unsuitable product designs. How one correctly specifies the switch point of a float switch will be explained here.<\/strong><\/p>\n

The basic prerequisite for the correct specification and the manufacturing to requirements\u00a0of a float switch is that both the customer and manufacturer have a uniform reference condition. Float switches are specified with the following parameters:<\/p>\n

\u2022\u00a0\u00a0 \u00a0Installation from above (process connection above float body)
\n\u2022\u00a0\u00a0 \u00a0Dimensioning from the sealing edge downwards
\n\u2022\u00a0\u00a0 \u00a0Empty tank – float is in the rest position on the limiting element
\n\u2022\u00a0\u00a0 \u00a0Level rising
\n\u2022\u00a0\u00a0 \u00a0Density of the medium: 1.00 g\/cm\u00b3<\/p>\n

The contact functions of a float switch<\/h2>\n

Three contact types \/ switching functions can now be defined for the specification of a float switch:<\/p>\n

\u2022\u00a0\u00a0 \u00a0Normally open \/ n.o.
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u2013 the contact closes as the filling level increases
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u2013 the contact opens when the filling level drops again
\n\u2022\u00a0\u00a0 \u00a0Normally closed \/ n.c.
\n\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u2013 the contact opens as the filling level increases
\n\u00a0 \u00a0\u00a0\u00a0 \u00a0 \u2013 the contact closes when the filling level drops again
\n\u2022\u00a0\u00a0 \u00a0Change-over contact \/ SPDT
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2013 the 3-wire contact provides two output circuits, which can be connected as required
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2013 one output closes as the filling level increases \/ opens when the filling level drops again
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2013 one output opens as the filling level increases \/ closes when the filling level drops again<\/p>\n

The specification of the switch point<\/h2>\n

The correct specification of the switch point of a float switch with a switch point, as an example:<\/p>\n

\u2022\u00a0\u00a0 \u00a0Switch point position 150 mm (from the sealing edge to the desired switching level)
\n\u2022\u00a0\u00a0 \u00a0Switching function normally open \/ n.o.
\n\u2022\u00a0\u00a0 \u00a0Guide tube length 200 mm (from the sealing edge to the end of the tube)<\/p>\n\n

\"Float

Float switch (drawing)<\/p><\/div>\n \n

The guide tube length \u201cL\u201d must always be greater than the distance between the switch points from the process connection in order to allow the float body to assume a rest position, in which the switching output is not yet switched (cf. drawing). From the rest position, the float rises with increasing level and switches the desired function (e.g. normally open) at the defined level (switch point position).<\/p>\n

The guide tube length is defined by the lowest switch point + dead band \u201cT\u201d. Depending on the size of the selected float body, the dead band is generally between 25 and 50 mm and is also defined in the manufacturer’s data sheet.<\/p>\n

Expert tip: Density dependency and hysteresis of the switch point<\/h2>\n

The float, as a suspended hollow body, is influenced by the density of the medium. For very low-density media (e.g. light oils), the float will immerse deeper in the medium than in the reference medium of water with a density of 1 g\/cm\u00b3. This deeper immersion of the float will result in a small deviation of the switch point position by a few millimetres.<\/p>\n

Last but not least, the hysteresis of a reed contact causes the reset point of a float switch to be a few millimetres below the switch point.<\/p>\n

Note<\/strong>
\nAs a leading provider of float-based, measurement technology solutions, WIKA has a wide range of variants to meet all your application-specific requirements. Our range of float switches<\/a> can be found on the WIKA website. Your contact person<\/a> will be pleased to advise you on the selection of the appropriate product solution and specification of the switch points.<\/p>\n","protected":false},"excerpt":{"rendered":"

In the specification of the switch points\u00a0of a float switch, misunderstandings always lead to unsuitable product designs. How one correctly specifies the switch point of a float switch will be explained here. The basic prerequisite for the correct specification and the manufacturing to requirements\u00a0of a float switch is that both the customer and manufacturer have […]<\/p>\n","protected":false},"author":11,"featured_media":8074,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[223],"tags":[574,210,102],"class_list":["post-8069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-level-products","tag-level-switch","tag-switching-fuction","tag-switching-output"],"acf":[],"yoast_head":"\nHow does one specify the switch point of a float switch?<\/title>\n<meta name=\"description\" content=\"In the specification of the switch points for a float switch, misunderstandings always lead to unsuitable product designs.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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