{"product_id":"kl3312-beckhoff-2-channel-thermocouple-input-terminal","title":"KL3312 Beckhoff 2-Channel Thermocouple Input Terminal","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003e\u003cspan class=\"citation-21\"\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003eKL3312 (KL3312)\u003c\/strong\u003e\u003cspan class=\"citation-21\"\u003e\u003cspan\u003e \u003c\/span\u003eis a high-precision\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003e2-channel analog input terminal\u003c\/strong\u003e\u003cspan class=\"citation-21 citation-end-21\"\u003e\u003cspan\u003e \u003c\/span\u003especifically designed for the direct connection of thermocouples in a Beckhoff Bus Terminal system.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-20\"\u003eIt utilizes 2-wire technology to process signals from various thermocouple types, including\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003eJ, K, L, B, E, N, R, S, T, and U\u003c\/strong\u003e\u003cspan class=\"citation-20 citation-end-20\"\u003e.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-19\"\u003eThe module features an integrated microprocessor that performs linearization across the entire temperature range and provides\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003einternal cold junction compensation\u003c\/strong\u003e\u003cspan class=\"citation-19 citation-end-19\"\u003e, eliminating the need for external compensation hardware.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-18\"\u003eWith its \"fine granularity\" design and built-in\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003eopen-circuit (wire break) recognition\u003c\/strong\u003e\u003cspan class=\"citation-18\"\u003e, the\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003eKL3312\u003c\/strong\u003e\u003cspan class=\"citation-18 citation-end-18\"\u003e\u003cspan\u003e \u003c\/span\u003eis an essential component for temperature monitoring in industrial furnaces, plastic injection molding, and thermal processing plants.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eAdvanced Diagnostics \u0026amp; Flexibility\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eBeckhoff KL3312\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis engineered for high operational safety.\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-17\"\u003eEach channel is equipped with an\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003eError LED\u003c\/strong\u003e\u003cspan class=\"citation-17 citation-end-17\"\u003e\u003cspan\u003e \u003c\/span\u003ethat instantly signals a broken wire or open circuit, allowing maintenance teams to identify sensor failures without complex software troubleshooting.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-16\"\u003eBeyond temperature measurement, the module can be configured for\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003elow-voltage mV measurement\u003c\/strong\u003e\u003cspan class=\"citation-16 citation-end-16\"\u003e\u003cspan\u003e \u003c\/span\u003e(±30 mV or ±120 mV), making it a versatile tool for various bridge-based sensors.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eThe temperature range and sensor type can be selected freely via the Bus Coupler or controller software, ensuring the terminal can adapt to changing process requirements without hardware swaps.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eKL3312\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBeckhoff\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eNumber of Inputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSensor Types\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eType J, K, L, B, E, N, R, S, T, U (Default: Type K)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eResolution\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.1 °C per digit\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eConversion Time\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e~250 ms (Configurable)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMeasuring Error\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u0026lt; ±0.5% (Relative to full scale value)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCold Junction Comp.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eInternal (via terminal temperature measurement)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eElectrical Isolation\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e500 V (K-bus\/signal voltage)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eCurrent Consump. K-bus\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eTyp. 65 mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e~70 g (Net) \/ 1 kg (Shipping)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow does \"Open-Circuit Recognition\" improve system reliability?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThermocouples are prone to mechanical wear and vibration-induced breaks.\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-15\"\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003eKL3312\u003c\/strong\u003e\u003cspan class=\"citation-15 citation-end-15\"\u003e\u003cspan\u003e \u003c\/span\u003econtinuously monitors the circuit's continuity; if a wire snaps, the Error LED lights up and a status bit is sent to the PLC.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eThis prevents the control system from interpreting a failed sensor as a \"low temperature\" and erroneously increasing heater power.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use the KL3312 for non-thermocouple voltage signals?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes.\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-14\"\u003eThe terminal can be configured for\u003cspan\u003e \u003c\/span\u003e\u003c\/span\u003e\u003cstrong\u003emV measurement mode\u003c\/strong\u003e\u003cspan class=\"citation-14 citation-end-14\"\u003e.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eThis is particularly useful for small signal outputs from specialized laboratory equipment or sensors that output within the ±120 mV range, providing a high-resolution 16-bit data format in the process image.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat cabling is required for the KL3312?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTo maintain accuracy, you must use\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ecompensation cables\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eor\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ethermocouple extension wires\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003emade of the same materials as the thermocouple itself up to the terminal connection. Using standard copper wire will create unintended \"parasitic\" thermocouples at the connection points, leading to significant temperature measurement errors.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eField Engineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eGrounding for Earthed Thermocouples:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIf using earthed (grounded) thermocouples, ensure the shield is connected to the functional earth.\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-13 citation-end-13\"\u003eFor differential inputs, the common-mode voltage should not exceed ±2 V relative to ground to maintain 12-bit accuracy.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCold Junction Accuracy:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFor the most accurate internal cold junction compensation, avoid placing the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eKL3312\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003enext to high-heat-generating modules (like power supply terminals or motor starters). A stable ambient temperature at the terminal block is critical for the internal NTC sensor's precision.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eShielding:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAlways use the shield terminals provided on the KL3312. Proper shielding is essential to protect the low-microvolt thermocouple signals from the electromagnetic noise typically generated by nearby VFDs or heavy switching gear.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eKL3312\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003estands out for its integrated intelligence. By handling the complex\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003elinearization and compensation\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ealgorithms on-board the microprocessor, it frees up the main PLC's CPU cycles for other control tasks.\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"citation-12 citation-end-12\"\u003eIts compact 12 mm housing allows for high-density temperature monitoring in space-constrained panels.\u003csup class=\"superscript\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eWhether configured for standard Type K monitoring or high-temperature Type S applications, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eKL3312\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eprovides a robust, industrial-grade interface that ensures long-term stability and precise thermal control.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"BECKHOFF","offers":[{"title":"Default Title","offer_id":53106529075563,"sku":"KL3312","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/KL3312-j45vnxty2yf.png?v=1776245158","url":"https:\/\/www.plcprotech.com\/products\/kl3312-beckhoff-2-channel-thermocouple-input-terminal","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}