{"id":7641,"date":"2026-04-17T12:37:49","date_gmt":"2026-04-17T12:37:49","guid":{"rendered":"https:\/\/ultrasuonindt.it\/how-to-choose-the-right-ultrasonic-transducer-for-every-application\/"},"modified":"2026-09-30T15:50:51","modified_gmt":"2026-09-30T15:50:51","slug":"how-to-choose-the-right-ultrasonic-transducer-for-every-application","status":"publish","type":"post","link":"https:\/\/ultrasuonindt.it\/en\/how-to-choose-the-right-ultrasonic-transducer-for-every-application\/","title":{"rendered":"How to choose the right ultrasonic transducer for every application"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The choice of the <strong>ultrasonic transducer<\/strong> (probe) is just as important as the choice of the instrument. The wrong probe can compromise the measurement even with the best gauge on the market. This guide helps you navigate the Dakota NDT options \u2014 <strong>dual element, single element, delay line, shear wave, high temperature<\/strong> \u2014 and select the one best suited to each application.  <\/p>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"387\" height=\"252\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-immagine_di_sonde_alta_frequenza_con_delay_line_ad_ultrasuoni.jpg?resize=387%2C252&#038;ssl=1\" alt=\"Dakota NDT ultrasonic transducers\" class=\"wp-image-240\" style=\"width:600px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-immagine_di_sonde_alta_frequenza_con_delay_line_ad_ultrasuoni.jpg?w=387&amp;ssl=1 387w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-immagine_di_sonde_alta_frequenza_con_delay_line_ad_ultrasuoni.jpg?resize=300%2C195&amp;ssl=1 300w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">Fundamental parameters of an ultrasonic probe<\/h2>\n\n<ul class=\"wp-block-list\">\n<li><strong>Frequency<\/strong>: typically 1-20 MHz. High frequencies = better resolution, poorer penetration; low frequencies = greater penetration, lower resolution <\/li>\n\n\n\n<li><strong>Crystal diameter<\/strong>: from 3 to 25 mm. Large diameters = narrower and more directional beam, small diameters = more divergent beam<\/li>\n\n\n\n<li><strong>Crystal type<\/strong>: single element (one crystal that transmits and receives), dual element (two separate crystals)<\/li>\n\n\n\n<li><strong>Refraction angle<\/strong>: 0\u00b0 for normal measurements, 45\u00b0\/60\u00b0\/70\u00b0 for angled weld inspections<\/li>\n\n\n\n<li><strong>Presence of a delay line<\/strong>: acrylic waveguide placed between the crystal and the material<\/li>\n\n\n\n<li><strong>Maximum operating temperature<\/strong>: from 60 \u00b0C (standard) to 500 \u00b0C (high temperature probes)<\/li>\n<\/ul>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div class=\"wp-block-cover is-light popmake-4066 popmake-739\" style=\"border-width:1px;min-height:250px;aspect-ratio:unset;\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"250\" class=\"wp-block-cover__image-background wp-image-727 size-full\" alt=\"\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1200%2C250&#038;ssl=1\" data-object-fit=\"cover\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=300%2C63&amp;ssl=1 300w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=1024%2C213&amp;ssl=1 1024w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/banner_technical_support_choose_products.png?resize=768%2C160&amp;ssl=1 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><span aria-hidden=\"true\" class=\"wp-block-cover__background has-background-dim-30 has-background-dim\" style=\"background-color:#d3d6dc\"><\/span><div class=\"wp-block-cover__inner-container is-layout-constrained wp-container-core-cover-is-layout-15701bb7 wp-block-cover-is-layout-constrained\">\n<p class=\"has-text-align-right has-ti-fg-color is-style-default has-luminous-vivid-amber-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\" style=\"font-size:clamp(21.536px, 1.346rem + ((1vw - 3.2px) * 1.374), 35px);\"><strong>Need help choosing the right product?<\/strong><\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-b507c051 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button popmake-4066 popmake-739\"><a class=\"wp-block-button__link has-ti-accent-color has-cyan-bluish-gray-background-color has-text-color has-background has-link-color wp-element-button\">Contact us<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<h2 class=\"wp-block-heading\">Dual element probes for corrosion measurement<\/h2>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"387\" height=\"252\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-dual-dey-deatures_sonda_dual_element_schema_funzionamento.jpg?resize=387%2C252&#038;ssl=1\" alt=\"Dual element probe diagram\" class=\"wp-image-221\" style=\"width:500px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-dual-dey-deatures_sonda_dual_element_schema_funzionamento.jpg?w=387&amp;ssl=1 387w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-dual-dey-deatures_sonda_dual_element_schema_funzionamento.jpg?resize=300%2C195&amp;ssl=1 300w\" sizes=\"auto, (max-width: 387px) 100vw, 387px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\"><strong>Dual element probes<\/strong> have two separate piezoelectric crystals \u2014 one transmitter and one receiver \u2014 mounted in a single housing with a slight convergent tilt. They are the standard probes for the CX, ZX, MX and CMX series corrosion gauges from Dakota NDT. Advantages:  <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Stable measurement<\/strong> even on corroded, rough or painted surfaces<\/li>\n\n\n\n<li><strong>Reduction of the &#8220;dead zone&#8221;<\/strong> in the transmission area<\/li>\n\n\n\n<li><strong>Compatibility with ThruPaint\u2122<\/strong>: the dual element geometry makes it easier to separate multiple echoes<\/li>\n\n\n\n<li><strong>Lower sensitivity<\/strong> to the probe not being perpendicular<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Typical frequencies: 2, 5, 7.5, 10 MHz. The 5 MHz 1\/4 inch probe is supplied as standard on all CX models and is the most widely used for general industrial applications. <\/p>\n\n<h2 class=\"wp-block-heading\">Single element probes for precision measurement<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>Single element probes<\/strong> have a single crystal that transmits and receives in time sequence. They are the probes of choice for: <\/p>\n\n<ul class=\"wp-block-list\">\n<li><\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Probes with delay line<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>Single element probes with delay line<\/strong> have a block of acrylic (or another material of known velocity) placed between the crystal and the measurement surface. They serve for: <\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Measurement of thin thicknesses<\/strong>: the delay line moves the interface echo away from the back wall echo, allowing measurements down to 0.1 mm<\/li>\n\n\n\n<li><strong>Inspection of composite components and laminates<\/strong><\/li>\n\n\n\n<li><strong>Measurement through protective coatings<\/strong> other than paint (e.g. rubber, elastomers)<\/li>\n\n\n\n<li><strong>Protection of the probe<\/strong> from abrasion on rough surfaces<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Shear wave probes for weld inspection<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong>Shear wave probes<\/strong> (transverse waves) are mounted on wedges that create an angle of incidence to generate angled waves in the material. They are the weld inspection probes for the Dakota FX70-DL, FX71-DL and FX81-DL flaw detectors. Typical angles:  <\/p>\n\n<ul class=\"wp-block-list\">\n<li><\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Other Dakota probe categories<\/h2>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"680\" height=\"500\" src=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-accessorio_valigetta.jpg?resize=680%2C500&#038;ssl=1\" alt=\"Dakota NDT accessories and transducers\" class=\"wp-image-253\" style=\"width:500px\" srcset=\"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-accessorio_valigetta.jpg?w=680&amp;ssl=1 680w, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-accessorio_valigetta.jpg?resize=300%2C221&amp;ssl=1 300w\" sizes=\"auto, (max-width: 680px) 100vw, 680px\" \/><\/figure>\n\n<ul class=\"wp-block-list\">\n<li><strong>High temperature probes<\/strong>: for surfaces up to 500 \u00b0C (superheated steam lines, hot plant)<\/li>\n\n\n\n<li><strong>Underwater probes<\/strong>: with cable and sealed LEMO connector, for measurements on submerged structures; the configuration is defined case by case according to depth and method of use<\/li>\n\n\n\n<li><strong>Low frequency probes<\/strong> (1 MHz): for highly attenuating materials (cast iron, plastics, composites) \u2014 the ideal pairing with the PMX4-DL<\/li>\n\n\n\n<li><strong>Small diameter probes<\/strong>: for small-diameter tubes and curved geometries<\/li>\n\n\n\n<li><strong>Immersion probes<\/strong>: for laboratory applications in a tank<\/li>\n<\/ul>\n\n<h2 class=\"wp-block-heading\">Quick selection matrix<\/h2>\n\n<figure class=\"wp-block-table alignwide\"><table><thead><tr><th>Application<\/th><th>Recommended probe<\/th><\/tr><\/thead><tbody><tr><td>Standard steel thickness measurement (&gt;3 mm)<\/td><td>Dual element 5 MHz 1\/4&#8243;<\/td><\/tr><tr><td>Corroded or coated surfaces<\/td><td>Dual element HD 5 MHz with ThruPaint\u2122<\/td><\/tr><tr><td>Thin thicknesses (&lt; 1 mm)<\/td><td>Single element delay line 10-20 MHz<\/td><\/tr><tr><td>Attenuating materials (cast iron, composites)<\/td><td>Dual element 1-2 MHz low frequency<\/td><\/tr><tr><td>Structural welds<\/td><td>Angled shear wave 45\u00b0\/60\u00b0\/70\u00b0<\/td><\/tr><tr><td>Precision measurements (aerospace)<\/td><td>High-frequency single element delay line<\/td><\/tr><tr><td>Small-diameter tubes<\/td><td>Small diameter dual element<\/td><\/tr><tr><td>High temperature<\/td><td>High temperature dedicated<\/td><\/tr><tr><td>Underwater<\/td><td>Underwater probe with sealed cable and connector, configuration case by case<\/td><\/tr><tr><td>Bolt tension<\/td><td>Specific contact single element<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<p class=\"wp-block-paragraph\">To choose the optimum probe for your specific application and check compatibility with the instrument you have, <a href=\"https:\/\/ultrasuonindt.it\/en\/contact\/\">contact our technical department<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The choice of the ultrasonic transducer is crucial to the quality of the measurement. A complete guide to Dakota NDT probes: dual element for corrosion, single element for precision, delay line for thin thicknesses, angled shear wave for welds, high temperature, underwater and low frequency for difficult materials. <\/p>\n","protected":false},"author":157040980,"featured_media":7642,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"{title}\n\n{excerpt}\n\n{url}","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[73],"tags":[75,104,77,95,96,76,97,74],"class_list":["post-7641","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ndt-technical-guides","tag-echo-echo-thrupaint-measurement-through-paint","tag-stainless-steel-thickness-measurement","tag-thickness-measurement-on-carbon-steel","tag-ultrasonic-aluminium-thickness-measurement","tag-ultrasonic-cast-iron-thickness-measurement","tag-ultrasonic-corrosion-measurement","tag-ultrasonic-plastics-thickness-measurement","tag-ultrasonic-pulse-echo-measurement"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Choose the Ultrasonic Transducer | RODER<\/title>\n<meta name=\"description\" content=\"How to choose the Dakota ultrasonic transducer: dual element, single element, delay line, shear wave, high temperature, underwater. 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Official technical specifications, differences in functions (ThruPaint\u2122, data logger, B-Scan) and criteria for choosing the model best suited to Your industrial application.","rel":"","context":"In &quot;Product Comparisons&quot;","block_context":{"text":"Product Comparisons","link":"https:\/\/ultrasuonindt.it\/en\/categoria\/product-comparisons\/"},"img":{"alt_text":"Dakota NDT CX ultrasonic thickness measurement application on fabricated steel parts","src":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-strumento_CX_applicazione_misura_spessore_su_parti_di_carpenteria-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":9176,"url":"https:\/\/ultrasuonindt.it\/en\/ndt-standards-for-thickness-measurement-en-14127-astm-e797-and-en-15317\/","url_meta":{"origin":7641,"position":3},"title":"NDT standards for thickness measurement: EN 14127, ASTM E797 and EN 15317","author":"GSM","date":"17 April 2026","format":false,"excerpt":"The reference NDT standards for ultrasonic thickness measurement: EN 14127 for the measurement procedure, ASTM E797 as the American standard, EN 15317 for instrument qualification and EN 12668-1 for flaw detectors. 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A guide to the technical strategies for obtaining reliable results: instrument selection (PMX4-DL, CMX, FX), probe, couplant, calibration and A-Scan validation.","rel":"","context":"In &quot;NDT Technical Guides&quot;","block_context":{"text":"NDT Technical Guides","link":"https:\/\/ultrasuonindt.it\/en\/categoria\/ndt-technical-guides\/"},"img":{"alt_text":"Dakota NDT ultrasonic probe and couplant for measurement","src":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-immagine_con_sonda_ad_ultrasuoni_e_liquido_accoppiante-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-immagine_con_sonda_ad_ultrasuoni_e_liquido_accoppiante-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-immagine_con_sonda_ad_ultrasuoni_e_liquido_accoppiante-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-immagine_con_sonda_ad_ultrasuoni_e_liquido_accoppiante-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/ultrasuonindt.it\/wp-content\/uploads\/2026\/04\/dakota_ndt-strumenti_di_misura_ad_ultrasuoni-immagine_con_sonda_ad_ultrasuoni_e_liquido_accoppiante-web-1200x1200-1.webp?fit=1200%2C1200&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":8450,"url":"https:\/\/ultrasuonindt.it\/en\/1-point-vs-2-point-calibration-the-differences-and-when-to-use-each\/","url_meta":{"origin":7641,"position":5},"title":"1-point vs 2-point calibration: the differences and when to use each","author":"GSM","date":"17 April 2026","format":false,"excerpt":"Calibrating the ultrasonic instrument is fundamental to the accuracy of the readings. 1-point calibration corrects the offset and is quick; 2-point calibration also corrects the gain, for accurate readings across wide ranges. 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