{"id":2689,"date":"2023-08-06T17:57:08","date_gmt":"2023-08-06T17:57:08","guid":{"rendered":"https:\/\/volleyballvnl.com\/?p=2689"},"modified":"2023-08-06T17:57:08","modified_gmt":"2023-08-06T17:57:08","slug":"how-does-one-specify-the-switch-point-of-a-float-switch-3","status":"publish","type":"post","link":"https:\/\/volleyballvnl.com\/?p=2689","title":{"rendered":"How does one specify the switch point of a float switch?"},"content":{"rendered":"\n<p>In the specification of the switch points of 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.<br\/>The basic prerequisite for the correct specification and the manufacturing to requirements of a float switch is that both the customer and manufacturer have a uniform reference condition. Float switches are specified with the following parameters:<br\/>\u2022 Installation from above (process connection above float body)<br\/>\u2022 Dimensioning from the sealing edge downwards<br\/>\u2022 Empty tank \u2013 float is in the rest position on the limiting element<br\/>\u2022 Level rising<br\/>\u2022 Density of the medium: 1.00 g\/cm\u00b3<br\/>The contact functions of a float switch<br\/>Three contact types \/ switching functions can now be defined for the specification of a float switch:<br\/>\u2022 Normally open \/ n.o.<br\/>\u2013 the contact closes as the filling level increases<br\/>\u2013 the contact opens when the filling level drops again<br\/>\u2022 Normally closed \/ n.c.<br\/>\u2013 the contact opens as the filling level increases<br\/>\u2013 the contact closes when the filling level drops again<br\/>\u2022 Change-over contact \/ SPDT<br\/>\u2013 the 3-wire contact provides two output circuits, which can be connected as required<br\/>\u2013 one output closes as the filling level increases \/ opens when the filling level drops again<br\/>\u2013 one output opens as the filling level increases \/ closes when the filling level drops again<br\/>The specification of the switch point<br\/>The correct specification of the switch point of a float switch with a switch point, as an example:<br\/>\u2022 Switch point position 150 mm (from the sealing edge to the desired switching level)<br\/>\u2022 Switching function normally open \/ n.o.<br\/> <a href=\"http:\/\/equiptmentplus.com\">Authoritative<\/a>  (from the sealing edge to the end of the tube)<br\/>Float switch (drawing)<br\/>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).<br\/>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\u2019s data sheet.<br\/>Expert tip: Density dependency and hysteresis of the switch point<br\/>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.<br\/>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.<br\/>Note<br\/>As 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 can be found on the WIKA website. Your contact person 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":"<p>In the specification of the switch points of 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 of a float switch is that both the customer and manufacturer [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2689","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts\/2689","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2689"}],"version-history":[{"count":1,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts\/2689\/revisions"}],"predecessor-version":[{"id":2690,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=\/wp\/v2\/posts\/2689\/revisions\/2690"}],"wp:attachment":[{"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2689"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2689"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/volleyballvnl.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2689"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}