Magnetic probe and reel – Specifications<\/title>\n <style>\n body {\n font-family: Arial, sans-serif;\n padding: 20px;\n background-color: #f5f5f5;\n }\n table {\n width: 100%;\n max-width: 1000px;\n margin: 0 auto;\n border-collapse: collapse;\n background-color: white;\n box-shadow: 0 2px 4px rgba(0,0,0,0.1);\n }\n th, td {\n border: 1px solid #333;\n padding: 10px;\n text-align: center;\n }\n th {\n background-color: #e0e0e0;\n color: #000;\n font-weight: bold;\n }\n .main-header {\n background-color: #d0d0d0;\n font-weight: bold;\n }\n .sub-header {\n background-color: #e8e8e8;\n font-weight: bold;\n }\n tr:hover {\n background-color: #f9f9f9;\n }\n <\/style>\n<\/head>\n<body>\n <table>\n <tr>\n <th class=\"main-header\">Magnetic probe and reel<\/th>\n <th class=\"main-header\" colspan=\"2\">SJ-7000<\/th>\n <th class=\"main-header\" colspan=\"2\">SJ-7010<\/th>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Measurement range<\/th>\n <td colspan=\"2\">50 meter<\/td>\n <td colspan=\"2\">100 meter<\/td>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Probe dimension<\/th>\n <td colspan=\"4\">\u00d819 X 180mm<\/td>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Tape Accuracy<\/th>\n <td colspan=\"4\">1mm<\/td>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Resolution<\/th>\n <td colspan=\"4\">\u00b11mm<\/td>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Spider magnet<\/th>\n <th>SJ-7130<\/th>\n <th>SJ-7140<\/th>\n <th>SJ-7160<\/th>\n <th>SJ-7170<\/th>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Diameter<\/th>\n <td>\u00d830 (for PVC pipe)<\/td>\n <td>\u00d840 (for PVC pipe)<\/td>\n <td>\u00d860 (for inclinomter casing)<\/td>\n <td>\u00d870 (for inclinomter casing)<\/td>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Ring magnet (Datum magnet)<\/th>\n <th>SJ-7230<\/th>\n <th>SJ-7240<\/th>\n <th>SJ-7260<\/th>\n <th>SJ-7270<\/th>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Diameter<\/th>\n <td>\u00d830 (for PVC pipe)<\/td>\n <td>\u00d840 (for PVC pipe)<\/td>\n <td>\u00d860 (for inclinomter casing)<\/td>\n <td>\u00d870 (for inclinomter casing)<\/td>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Magnet plate<\/th>\n <th>SJ-7330<\/th>\n <th>SJ-7340<\/th>\n <th>SJ-7360<\/th>\n <th>SJ-7370<\/th>\n <\/tr>\n <tr>\n <th class=\"sub-header\">Diameter<\/th>\n <td>\u00d830 (for PVC pipe)<\/td>\n <td>\u00d840 (for PVC pipe)<\/td>\n <td>\u00d860 (for inclinomter casing)<\/td>\n <td>\u00d870 (for inclinomter casing)<\/td>\n <\/tr>\n <\/table>\n<\/body>\n<\/html>\n\n\n\n<h3 class=\"wp-block-heading\">Installation<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Operator shall fix datum magnet (ring magnet) by screw nail or clamp the above 50cm from the<br>bottom of PVC access pipe (or inclinometer casing).<\/li>\n\n\n\n<li>Operator fix datum magnet at the steady layer as like rock and install spider magnet by<br>installationrod or leg at the plaining depth step by step.<\/li>\n\n\n\n<li>Size of magnetic sensors depend on diameter of borehole, and datum magnet is smaller<br>thanborehole and spider magnetic including spider leg is bigger than diameter of borehole to<br>protect slip.<\/li>\n\n\n\n<li>Operator insert tremie pipe or grout pipe into borehole and grout borehole from bottom by pump<br>and grout borehole from bottom by pump.<\/li>\n\n\n\n<li>Operator shall install magnetic spider to has enough space from coupling for protection<br>that magnetic sensors are caught by coupling during settling.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"391\" height=\"1024\" src=\"https:\/\/foredencnc.com\/wp-content\/uploads\/2025\/11\/image-23-391x1024.png\" alt=\"\" class=\"wp-image-1404\" srcset=\"https:\/\/foredencnc.com\/wp-content\/uploads\/2025\/11\/image-23-391x1024.png 391w, https:\/\/foredencnc.com\/wp-content\/uploads\/2025\/11\/image-23-114x300.png 114w, https:\/\/foredencnc.com\/wp-content\/uploads\/2025\/11\/image-23.png 526w\" sizes=\"auto, (max-width: 391px) 100vw, 391px\" \/><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"929\" height=\"696\" src=\"https:\/\/foredencnc.com\/wp-content\/uploads\/2025\/11\/image-24.png\" alt=\"\" class=\"wp-image-1405\" style=\"width:401px;height:auto\" srcset=\"https:\/\/foredencnc.com\/wp-content\/uploads\/2025\/11\/image-24.png 929w, https:\/\/foredencnc.com\/wp-content\/uploads\/2025\/11\/image-24-300x225.png 300w, https:\/\/foredencnc.com\/wp-content\/uploads\/2025\/11\/image-24-768x575.png 768w\" sizes=\"auto, (max-width: 929px) 100vw, 929px\" \/><\/figure>\n<\/div>\n\n\n<p>Operation of magnetic extensometer indicator \u2463 <\/p>\n\n\n\n<p>Our magnetic extensometer indicator can be used for magnetic extensometer and water level meter. <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li> \u2460 Operation switch: If the operator pushes the switch to No.1 direction, this indicator can be used for the water level meter. <\/li>\n\n\n\n<li> If the operator pushes the switch to No.1 direction and the probe touches water, the green light \u2461 turns \u201cOn\u201d and the buzzer sounds. <\/li>\n\n\n\n<li> If the operator pushes the switch to No.2 direction, this indicator can be used for the magnetic extensometer. <\/li>\n\n\n\n<li> If the operator pushes the switch to No.2 direction and the probe reaches magnetic, the yellow light \u2462 turns \u201cOn\u201d and the buzzer sounds. <\/li>\n\n\n\n<li> When the battery runs out of power, if the operator releases screws \u2463, the operator can exchange the battery (9 volt).<br><br><\/li>\n<\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Description Model SJ-7000 magnetic probe extensometer is designed to measure settlement or heave through movement of probe in PVC access pipe. Ring magnet and Spider magnets and magnet plate are installed at PVC access pipe and borehole. Probe sense magnetic position. If probe reach spider magnet, LED lamp is “ON”<span class=\"more-link\"><a href=\"https:\/\/foredencnc.com\/?p=1401\">Read More →<\/a><\/span><\/p>\n","protected":false},"author":2,"featured_media":1402,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,134,136,15,3,13,18],"tags":[95],"class_list":["entry","author-editor","post-1401","post","type-post","status-publish","format-standard","has-post-thumbnail","category-data-loggers","category-datalogger","category-measurements","category-news","category-products","category-readouts","category-support","tag-operation-manual-of-sj-7000-sj-4100"],"_links":{"self":[{"href":"https:\/\/foredencnc.com\/index.php?rest_route=\/wp\/v2\/posts\/1401","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/foredencnc.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/foredencnc.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/foredencnc.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/foredencnc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1401"}],"version-history":[{"count":1,"href":"https:\/\/foredencnc.com\/index.php?rest_route=\/wp\/v2\/posts\/1401\/revisions"}],"predecessor-version":[{"id":1406,"href":"https:\/\/foredencnc.com\/index.php?rest_route=\/wp\/v2\/posts\/1401\/revisions\/1406"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/foredencnc.com\/index.php?rest_route=\/wp\/v2\/media\/1402"}],"wp:attachment":[{"href":"https:\/\/foredencnc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1401"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/foredencnc.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1401"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/foredencnc.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1401"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

Model SJ-7000 magnetic probe extensometer is designed to measure settlement or heave through movement of probe in PVC access pipe. Ring magnet and Spider magnets and magnet plate are installed at PVC access pipe and borehole. Probe sense magnetic position. If probe reach spider magnet, LED lamp is “ON” and buzzer rings. When signal is “On”, operator measure millimeter graduation in tape.<\/p>\n\n\n\n

Ring magnet at the bottom of access pipe and immovable layer and insert spider magnets at planning depths. Reed switch is installed in probe and, if probe sense magnet filed during probe is lifted down, reed switch close and buzzer and LED lamp is operated automatically. <\/p>\n\n\n