{"title":"Clamp-On Strain Sensors, Mounted Without Glue","description":"\u003cp\u003e\u003cstrong\u003eClamp-on strain sensors\u003c\/strong\u003e read the surface strain of a component without a strain gauge having to be bonded to it. They are pressed on, set in place or screwed down, sit where they belong within seconds to minutes, and can be taken off and used again. They replace the bonded gauge wherever speed matters or wherever the same measuring point is needed more than once.\u003c\/p\u003e\n\u003ch2\u003eWhen a clamp-on sensor is worth it\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eThe component is left as it is.\u003c\/strong\u003e No adhesive, no grinding, no cleaning – and with the magnet sensors, no drilling either.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMounted in seconds instead of three quarters of an hour.\u003c\/strong\u003e A bonded gauge needs preparation and curing time; a clamp-on sensor does not.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eReusable.\u003c\/strong\u003e The sensor comes off as easily as it went on and is set at the next measuring point. No single-use material, no consumables.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eInterchangeable without recalibrating.\u003c\/strong\u003e Every version works with a 350 Ω foil bridge and gauge factor 2.0.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFor checking FEM calculations\u003c\/strong\u003e and for stress analysis on steel structures, presses and injection moulding machines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe designs compared\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMagnet mounting\u003c\/strong\u003e – holds on ferromagnetic surfaces by its own magnet and presses the gauge against the surface under a stainless steel foil. Ranges from ± 300 to ± 800 µε, depending on version and surface. Reads through coats of paint.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTie-bar strain sensor\u003c\/strong\u003e – for round tie bars from Ø 25 to 400 mm, ± 1000 µε, anodised aluminium housing, protection IP64. The usual solution on injection and die casting machines.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eStrain measuring ring\u003c\/strong\u003e – fitted with two screws, ± 1000 µε, 0.5 % accuracy without a calibration of its own.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat you need with them\u003c\/h3\u003e\n\u003cp\u003eEvery sensor in this range is \u003cstrong\u003epassive\u003c\/strong\u003e – the electronics are not inside the sensor. They work with any strain gauge amplifier; suitable units are listed under \u003ca href=\"\/en\/collections\/dms-brueckenmessverstaerker-ein-kanal\"\u003estrain gauge bridge amplifiers\u003c\/a\u003e and \u003ca href=\"\/en\/collections\/dms-messverstaerker-oem-platine\"\u003eOEM boards\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eWhere strain is to be read permanently at a fixed point and the component may be drilled for it, the \u003ca href=\"\/en\/collections\/dehnung-aufschraub-ds\"\u003ebolt-on strain transducer\u003c\/a\u003e is the more robust choice. \u003ca href=\"\/en\/collections\/dehnungsmessung\"\u003eStrain measurement \u0026amp; strain gauges\u003c\/a\u003e gives an overview of both routes.\u003c\/p\u003e\n\u003cp\u003eNot sure which design suits your surface and your measuring range? Write to us – we will look at the measuring point with you.\u003c\/p\u003e","products":[{"product_id":"dkfa-alternative-dehnungsmessstreifen-dms-magnethalter","title":"DKFA alternative to bonded strain gauges – magnetic holder","description":"\u003cp\u003eSurface strain measured without glue: two springs and two knurled screws press the \u003cstrong\u003eStrainPad\u003c\/strong\u003e – an encapsulated foil strain gauge of 10 mm diameter and 0.2 mm height – so firmly against a ferromagnetic surface that friction takes over the task of the adhesive.\u003c\/p\u003e\n\u003cp\u003eWhat the gauge then reads is the surface strain, in the same quality as a bonded gauge, and it reads it within seconds instead of the three quarters of an hour a bonded gauge needs to be prepared, glued and cured. The holder is taken off as quickly as it went on and used again on the next measuring point; nothing is drilled, nothing is ground, nothing is consumed. It cannot be overloaded – instead of damage an offset appears.\u003c\/p\u003e\n\u003ch2\u003eMeasurement\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDirect reading of the surface strain, like a bonded strain gauge\u003c\/li\u003e\n\u003cli\u003eMaximum strain ± 800 µm\/m\u003c\/li\u003e\n\u003cli\u003e350 Ω foil gauge, k = 2.0 ± 3 %\u003c\/li\u003e\n\u003cli\u003eUniaxial, 0.6 mm constantan grid, polyimide encapsulation, Ø 10 mm at 0.2 mm height\u003c\/li\u003e\n\u003cli\u003eAccuracy \u0026lt; ± 0.5 % of full scale, transverse sensitivity −0.1 %\u003c\/li\u003e\n\u003cli\u003eCannot be overloaded – an offset appears instead of damage\u003c\/li\u003e\n\u003cli\u003e1,000,000 load cycles at 300 µm\/m strain\u003c\/li\u003e\n\u003cli\u003ePassive – no amplifier inside; recommended bridge voltage 1 V, 10 V at most\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eMounting and use\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHolds magnetically – no drilling, grinding or gluing\u003c\/li\u003e\n\u003cli\u003eMounted and removed in seconds, reusable\u003c\/li\u003e\n\u003cli\u003eContact force 100 … 300 N, settling time 15 minutes\u003c\/li\u003e\n\u003cli\u003eSmallest radius of curvature 3 mm\u003c\/li\u003e\n\u003cli\u003eOperating temperature 5 … 60 °C, reference temperature 23 °C\u003c\/li\u003e\n\u003cli\u003eTemperature matching of 10.8·10⁻⁶ 1\/K for ferritic steel is possible\u003c\/li\u003e\n\u003cli\u003eHolders made of aluminum\u003c\/li\u003e\n\u003cli\u003eFor dynamic applications, for checking FEM calculations and for stress analysis\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eVersions\u003c\/h2\u003e\n\u003cp\u003eShown is the magnet holder with StrainPad. Other standard holders are available and individual ones are built to the application. Tell us the measuring point and we will name the holder that fits.\u003c\/p\u003e","brand":"octogon Shop","offers":[{"title":"Default Title","offer_id":57266202935622,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5558\/6374\/files\/DKFA_DGA__produkt_0e065bd4-190a-400c-b447-253f91633517.png?v=1790091881"},{"product_id":"dkfb-dehnungsmessring-fuer-runde-holme","title":"DKFB strain measuring ring for round tie bars","description":"\u003cp\u003eStrain measured on a round tie bar without glue and without calibration: the \u003cstrong\u003ering\u003c\/strong\u003e clamps around the bar with two screws and presses foil strain gauges, protected under a stainless steel foil, against the surface so firmly that friction carries the surface strain into the gauges.\u003c\/p\u003e\n\u003cp\u003eIt replaces the bonding a strain gauge otherwise needs, and with it the three quarters of an hour, the chemical cleaning and the grinding – the measuring location only has to be free of loose material such as rust or flaking paint, and a solvent is enough. It works on any round bar, magnetic or not.\u003c\/p\u003e\n\u003ch2\u003eMeasurement\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eReads the surface strain of the bar directly, like a bonded gauge\u003c\/li\u003e\n\u003cli\u003eRange ± 1000 µε, accuracy and linearity each \u0026lt; ± 0.5 % of full scale\u003c\/li\u003e\n\u003cli\u003eHysteresis \u0026lt; ± 0.2 %, repeatability \u0026lt; ± 0.1 %\u003c\/li\u003e\n\u003cli\u003eFoil gauge, GF = 2.0, 350 Ω bridge – usable without a calibration of its own\u003c\/li\u003e\n\u003cli\u003eSensitivity tolerance ± 0.2 %, transverse sensitivity 0.9 ± 0.2 %\u003c\/li\u003e\n\u003cli\u003eTwo versions: 2\/4 bridge with two active gauges, or full bridge, the latter only with cable and connector\u003c\/li\u003e\n\u003cli\u003eCannot be overloaded – an offset appears instead of damage\u003c\/li\u003e\n\u003cli\u003eSupply 5 V DC, 8 V DC at most, current draw below 15 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eMounting and use\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eClamped around the bar with two screws at 3 N·m – no adhesive, no drilling\u003c\/li\u003e\n\u003cli\u003eWorks on any round bar, magnetic or not\u003c\/li\u003e\n\u003cli\u003eNo chemical cleaning, no grinding – a solvent is enough; loose material such as rust or flaking paint has to go first\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e34 bar diameters from 50 to 400 mm\u003c\/strong\u003e, set in the order key\u003c\/li\u003e\n\u003cli\u003eOperating and storage temperature 0 … +55 °C\u003c\/li\u003e\n\u003cli\u003eProtection IP66 with connection C, IP40 with connection D\u003c\/li\u003e\n\u003cli\u003eAnodized aluminum housing, stainless steel cover\u003c\/li\u003e\n\u003cli\u003eCable lengths 0.5 m, 3 m, 5 m and 10 m – connection C only\u003c\/li\u003e\n\u003cli\u003eMade for cyclical measurement, such as clamping force on presses\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat you need with it\u003c\/h2\u003e\n\u003cp\u003eThe ring is \u003cstrong\u003epassive\u003c\/strong\u003e and needs an external amplifier. After mounting, the zero offset of the pressed-on gauges is high – an amplifier that resets it at the push of a button or by a signal therefore belongs to the measuring chain.\u003c\/p\u003e\n\u003cp\u003eThe ring is made to the bar diameter ordered. Beside the product code, its nameplate carries a type key of diameter, bridge, connection and cable length.\u003c\/p\u003e","brand":"octogon Shop","offers":[{"title":"Default Title","offer_id":57266202968390,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5558\/6374\/files\/DKFB_DGB_Ringhalter__octogon-DKFB-einzeln-1050x700_417e7fdc-1b75-46ff-9785-ec3e55b0e2eb.png?v=1789021157"},{"product_id":"dkfc-alternative-dehnungsmessstreifen-ohne-kleben-messring","title":"DKFC alternative to bonded strain gauges – no adhesive – measuring ring","description":"\u003cp\u003eClamping force read on the tie bar itself: two stainless steel belts hold the \u003cstrong\u003eDKFC\u003c\/strong\u003e around the bar and press the foil strain gauges, protected under a stainless film, so firmly against the surface that friction takes over the task of the adhesive.\u003c\/p\u003e\n\u003cp\u003eThe reading is the surface strain, in the same quality as a bonded gauge, and it is available within minutes instead of the better part of an hour. One sensor covers every tie bar from 25 to 400 mm – only the pair of belts changes with the diameter, and it changes every 2.5 mm of it. Mounting is non-destructive: nothing is drilled, welded or glued, and a sensor taken off one machine goes onto the next without being recalibrated. A tie bar fitted with one becomes a load cell in its own right.\u003c\/p\u003e\n\u003ch2\u003eMeasurement\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDirect reading of the surface strain, like a bonded strain gauge\u003c\/li\u003e\n\u003cli\u003eRange ± 1000 µε, high accuracy and linearity in tension and compression\u003c\/li\u003e\n\u003cli\u003e350 Ω foil bridge, GF = 2.0\u003c\/li\u003e\n\u003cli\u003eSensitivity tolerance ± 0.2 %, hysteresis \u0026lt; ± 0.2 %, repeatability \u0026lt; 0.1 % of full scale\u003c\/li\u003e\n\u003cli\u003e2\/4 bridge or 4\/4 full bridge, depending on version\u003c\/li\u003e\n\u003cli\u003eCannot be overloaded – an offset appears; the sensor is reset cyclically\u003c\/li\u003e\n\u003cli\u003eSupply 5 V DC, 8 V DC at most, current draw below 15 mA\u003c\/li\u003e\n\u003cli\u003eStatic and dynamic applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eMounting and use\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTwo stainless steel belts, 10 × 0.4 mm – no drilling, welding or gluing\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOne sensor for tie bars from 25 to 400 mm\u003c\/strong\u003e; one pair of belts per diameter, tolerance ± 2.5 mm\u003c\/li\u003e\n\u003cli\u003eTightening torque 2.0 N·m on the M4 screws, surface finish N7\u003c\/li\u003e\n\u003cli\u003eNon-destructive, quick and repeatable\u003c\/li\u003e\n\u003cli\u003eNo recalibration between removal and refitting\u003c\/li\u003e\n\u003cli\u003eProtection IP64, anodized aluminum housing\u003c\/li\u003e\n\u003cli\u003eCable 2 × PVC, screened, 2 × 0.14 mm², Ø 3.5 mm\u003c\/li\u003e\n\u003cli\u003eSix-pin connector or open ends with the 2\/4 bridge; lengths 0.5 m, 3 m, 5 m and 10 m\u003c\/li\u003e\n\u003cli\u003eFor presses, injection molding and die casting machines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat you need with it\u003c\/h2\u003e\n\u003cp\u003eThe sensor is \u003cstrong\u003epassive\u003c\/strong\u003e and works into any strain gauge amplifier; the VDA and DU families are the matching ones. The belts that hold the sensor on the bar depend on the diameter and are ordered separately – tell us the bar diameter and we will include the right pair.\u003c\/p\u003e","brand":"octogon Shop","offers":[{"title":"Default Title","offer_id":57266203001158,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5558\/6374\/files\/DKFC_GE1029__titelbild_d7cc8a09-2b3a-4a15-8a0f-20d99e0ea8eb.png?v=1790091880"},{"product_id":"dkfd-alternative-dehnungsmessstreifen-dms-dehnungssensor","title":"DKFD alternative to bonded strain gauges – strain sensor","description":"\u003cp\u003eSurface strain measured where it arises, without glue: the \u003cstrong\u003estrain sensor\u003c\/strong\u003e DKFD is the \u003cstrong\u003ealternative\u003c\/strong\u003e to the bonded strain gauge. It holds itself on a ferromagnetic surface by its own magnet and presses the foil strain gauge, protected under a stainless steel foil, so firmly against the surface that friction takes over the task of the adhesive.\u003c\/p\u003e\n\u003cp\u003eMounting takes seconds instead of the three quarters of an hour a bonded gauge needs. The surface is neither cleaned nor ground, and coats of paint do not stop the reading. Calibrated to GF = 2.00, the sensor reads tension and compression directly and can be exchanged without recalibrating the amplifier. It cannot be overloaded – an offset appears instead of damage – and it is used again. The usual instrument for checking FEM calculations and for stress analysis on flat steel structures.\u003c\/p\u003e\n\u003ch2\u003eMeasurement\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDirect reading of the surface strain, like a bonded strain gauge\u003c\/li\u003e\n\u003cli\u003eMeasuring range ± 300 … ± 500 µε, depending on the surface\u003c\/li\u003e\n\u003cli\u003eFoil strain gauge with GF = 2.0, bridge resistance 350 Ω\u003c\/li\u003e\n\u003cli\u003eOne quarter bridge active, 350 Ω completion resistor in the connector\u003c\/li\u003e\n\u003cli\u003eAccuracy and linearity each \u0026lt; ± 0.5 % of RO\u003c\/li\u003e\n\u003cli\u003eSensitivity tolerance ± 0.2 %, transverse sensitivity 0.9 ± 0.2 %\u003c\/li\u003e\n\u003cli\u003eCalibrated to GF = 2.00 for dynamic applications\u003c\/li\u003e\n\u003cli\u003ePassive – external amplifier recommended, such as MBA100, VDA or Monitor DU-1D\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eMounting and use\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMounted and removed in seconds with the tool included\u003c\/li\u003e\n\u003cli\u003eHolds on magnetic structures – no adhesive, no screws, no drilling\u003c\/li\u003e\n\u003cli\u003eThe surface needs neither cleaning nor grinding, and the reading passes through coats of paint\u003c\/li\u003e\n\u003cli\u003eSensors are interchangeable without recalibrating the amplifier\u003c\/li\u003e\n\u003cli\u003eReusable – no single-use material, no consumables\u003c\/li\u003e\n\u003cli\u003eSteel housing Ø 34 mm, 36 mm high, protection IP54\u003c\/li\u003e\n\u003cli\u003eSupply 5 V DC, 8 V DC at most, current draw below 15 mA\u003c\/li\u003e\n\u003cli\u003eOperating temperature 0 … +50 °C, storage 0 … +70 °C\u003c\/li\u003e\n\u003cli\u003eWeight including cable 200 g\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCable lengths\u003c\/h2\u003e\n\u003cp\u003e3 m as standard; 0.5 m, 5 m and 10 m are available, as is any intermediate length from 0.5 to 10 m. The connection is a six-pin connector, where 350 Ω can be measured across the bridge.\u003c\/p\u003e\n\u003cp\u003eSupplied with the sensor, cable and connector and the mounting tool, Ø 16 mm and 125 mm long. CE and UKCA are declared, RoHS for the whole range.\u003c\/p\u003e","brand":"octogon Shop","offers":[{"title":"Default Title","offer_id":57427213517126,"sku":null,"price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/5558\/6374\/files\/DKFD_QE1010__produkt_16f839b8-745b-48d9-ba3b-2615f62870b3.png?v=1790091215"}],"url":"https:\/\/octogon.org\/en\/collections\/strain-clamp-on-dk.oembed","provider":"octogon GmbH","version":"1.0","type":"link"}