{"product_id":"beckhoff-elx3351-ethercat-terminal-1-channel-intrinsically-safe-analog-input-module","title":"Beckhoff ELX3351 EtherCAT Terminal 1-Channel Intrinsically Safe Analog Input Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eExecuting high-precision force and weight measurements within hazardous areas is directly enabled by the \u003cstrong\u003eBeckhoff ELX3351\u003c\/strong\u003e EtherCAT Terminal. This intrinsically safe (Ex i) input module is designed for the direct connection of strain gauges and resistor measuring bridges in full-bridge configurations. Featuring high-resolution \u003cstrong\u003e24-bit analog-to-digital conversion\u003c\/strong\u003e, it guarantees precise signal acquisition even under demanding industrial conditions. The module integrates self-calibration mechanisms and dynamic filters to compensate for thermal drift and high-frequency mechanical vibration, making it a reliable choice for hazardous-area weighing, load cell monitoring, and process vessels.\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1.5rem; padding-left: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntrinsically Safe (Ex i) Interface:\u003c\/strong\u003e Direct connection to sensors located in Zone 0\/20 and Zone 1\/21 environments without requiring external barriers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Resolution Measurement:\u003c\/strong\u003e 24-bit analog conversion with 32-bit internal presentation for micro-volt level accuracy.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResistor Bridge Compatibility:\u003c\/strong\u003e Optimally interfaces with full-bridge strain gauges and resistor bridges ranging from 300 Ohm to 1.5 kOhm.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdvanced Signal Filtering:\u003c\/strong\u003e Configurable 50 Hz filters and dynamic low-pass options with a typical limit frequency of 3.6 kHz.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardware Self-Calibration:\u003c\/strong\u003e Internal reference pathways run automatic calibration cycles to eliminate measurement errors over time and temperature.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; margin-bottom: 1.5rem; padding-left: 1.5rem;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHazardous Weighing Systems:\u003c\/strong\u003e Direct connection to platform scales, vessel weighing systems, and silo level monitors in explosive dust or gas atmospheres.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProcess Industry Automation:\u003c\/strong\u003e Tension, torque, and force measurements in chemical, oil, and gas processing lines.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTest Bench Engineering:\u003c\/strong\u003e Dynamic load monitoring and strain gauge testing in laboratory environments requiring explosive safety.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications Table\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d;\"\u003e\n        \u003cth style=\"text-align: left; padding: 8px; font-weight: bold;\"\u003eParameter\u003c\/th\u003e\n        \u003cth style=\"text-align: left; padding: 8px; font-weight: bold;\"\u003eSpecification Value\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eBeckhoff\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eModel Number\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eELX3351\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eNumber of Inputs\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e1 (Full bridge configuration)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eNominal Bridge Resistance\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e300 Ohm to 1.5 kOhm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eMeasuring Range UD\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eMax. -18 to +18 mV\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eMeasuring Range UREF\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eMax. -12 to +12 V\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eResolution\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e24 bit (32 bit internal representation)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eConversion Time\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eTyp. 1.6 ms\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eInternal Resistance\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e\u0026gt; 25 kOhm (UR, differential), \u0026gt; 1 MOhm (UD, differential)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eMeasuring Error\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e\u0026lt; +\/-0.5% of full-scale value (with active self-calibration)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eCurrent Consumption E-bus\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eTyp. 85 mA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eEx Markings (ATEX)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eII 3(1)G Ex ec [ia Ga] IIC T4 Gc, II (1)D [Ex ia Da] IIIC, I (M1) [Ex ia Ma] I\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eEx Markings (IECEx)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eEx ec [ia Ga] IIC T4 Gc, [Ex ia Da] IIIC, [Ex ia Ma] I\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eOperating Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e-25 to +60 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eStorage Temperature\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e-40 to +85 degC\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eDimensions (W x H x D)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e12 mm x 100 mm x 68 mm\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eProduct Weight\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003eApprox. 60 g\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 8px; font-weight: bold;\"\u003eShipping Weight (Calculated)\u003c\/td\u003e\n        \u003ctd style=\"padding: 8px;\"\u003e2.0 kg (including protective industrial packaging)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eEmpirical Engineering Insights\u003c\/h3\u003e\n\u003ch3\u003eAlternative Models \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eUnlike the standard EL3351 terminal designed for non-hazardous zones, the ELX3351 is built strictly for Ex i intrinsically safe loops. Standard EL series terminals and ELX series terminals cannot be mixed on the same power segment without proper physical isolation. You must use an ELX9560 or ELX9410 power feed terminal to isolate the intrinsically safe power contacts from the standard EtherCAT terminal block segment to maintain Ex certification validity.\u003c\/p\u003e\n\n\u003ch3\u003eApplication Pitfalls \u0026amp; Engineering Notes\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eWhen deploying the ELX3351 in high-vibration applications such as mixing vessels or chemical reactors, utilize the built-in dynamic low-pass filters instead of basic averaging. If the self-calibration feature is active, minor fluctuations in loop cycle times may occur during calibration intervals (typically every few minutes). Ensure your TwinCAT control loops allow for these brief, microsecond-level calculation variances, or schedule calibrations during known process idle states.\u003c\/p\u003e\n\n\u003ch3\u003eCommissioning \u0026amp; Wiring Tips\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003eTo minimize measurement noise over long cable runs to the strain gauge, utilize shielded twisted-pair cables with the shield connected to the terminal housing's functional ground. Ensure safe separation distances of at least 50 mm between the intrinsically safe wiring connected to the ELX3351 and any non-intrinsically safe cabling in the control panel to comply with IEC 60079-14 standards.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"background-color: #fff5f5; border-left: 4px solid #c53030; padding: 1rem; margin-bottom: 1.5rem; color: #9b2c2c;\"\u003e\n  \u003cstrong\u003eCRITICAL WARNING:\u003c\/strong\u003e De-energize all system power contacts and terminal segments before mounting, wiring, or configuring the ELX3351 terminal. Failure to isolate power can result in spark generation, compromising safety in explosive atmospheres. Verify that the power segment is isolated by an approved ELX-series power supply terminal prior to applying power.\n\u003c\/div\u003e\n\n\u003cdiv style=\"margin-bottom: 1.5rem;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; margin-right: 12px; flex-shrink: 0; font-weight: bold;\"\u003e1\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748;\"\u003eMount the ELX3351 on a standard 35 mm DIN rail conforming to EN 60715, securing it firmly into place with the integrated locking slide.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; margin-right: 12px; flex-shrink: 0; font-weight: bold;\"\u003e2\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748;\"\u003eEnsure the double slot and key connection correctly aligns with adjacent ELX modules on the E-bus.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; margin-right: 12px; flex-shrink: 0; font-weight: bold;\"\u003e3\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748;\"\u003eStrip bridge sensor connections to 8–9 mm. Use a flat-blade screwdriver to depress the spring clamps, insert the solid or ferruled conductor, and release to secure.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"display: flex; align-items: flex-start;\"\u003e\n    \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; border-radius: 50%; width: 24px; height: 24px; display: flex; align-items: center; justify-content: center; margin-right: 12px; flex-shrink: 0; font-weight: bold;\"\u003e4\u003c\/div\u003e\n    \u003cdiv style=\"color: #2d3748;\"\u003ePerform a continuity and loop barrier check before energizing the isolated power segment via the TwinCAT system configuration.\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106456789355,"sku":"ELX3351","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/elx3351-r1uxwlvbv0t.png?v=1776244622","url":"https:\/\/www.plcprotech.com\/products\/beckhoff-elx3351-ethercat-terminal-1-channel-intrinsically-safe-analog-input-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}