{"product_id":"new-1pcs-for-temperature-controller-he-293","title":"New 1PCS - Temperature Controller HE-293","description":"\u003cstyle\u003e\n  \/* Koeed Namespace CSS - Strictly isolated for Shopify integration *\/\n  .koeed-container {\n    width: 100%;\n    font-family: inherit;\n    line-height: 1.6;\n    color: #333333;\n  }\n  .koeed-heading {\n    color: #16c8c8;\n    font-size: 1.5rem;\n    font-weight: bold;\n    margin-top: 2rem;\n    margin-bottom: 1rem;\n    border-bottom: 2px solid #16c8c8;\n    padding-bottom: 0.5rem;\n  }\n  .koeed-subheading {\n    color: #16c8c8;\n    font-size: 1.25rem;\n    font-weight: 600;\n    margin-top: 1.5rem;\n    margin-bottom: 0.75rem;\n  }\n  .koeed-brief-list {\n    list-style-type: disc;\n    padding-left: 1.5rem;\n    margin-bottom: 1.5rem;\n  }\n  .koeed-brief-list li {\n    margin-bottom: 0.5rem;\n  }\n  .koeed-table-wrapper {\n    overflow-x: auto;\n    width: 100%;\n    margin-bottom: 1.5rem;\n  }\n  .koeed-tech-table {\n    width: 100%;\n    border-collapse: collapse;\n    text-align: left;\n    font-size: 0.95rem;\n  }\n  .koeed-tech-table th, .koeed-tech-table td {\n    border: 1px solid #eeeeee;\n    padding: 12px 15px;\n  }\n  .koeed-tech-table th {\n    background-color: #16c8c8;\n    color: #ffffff;\n    font-weight: 600;\n  }\n  .koeed-tech-table tr:nth-child(even) {\n    background-color: #f4fcfc;\n  }\n  .koeed-tech-table tr:nth-child(odd) {\n    background-color: #fafafa;\n  }\n  .koeed-tool-box {\n    background-color: #f4fcfc;\n    border: 1px solid #16c8c8;\n    border-radius: 8px;\n    padding: 1.5rem;\n    margin: 2rem 0;\n  }\n  .koeed-form-group {\n    margin-bottom: 1rem;\n  }\n  .koeed-form-group label {\n    display: block;\n    font-weight: 600;\n    margin-bottom: 0.5rem;\n    color: #333333;\n  }\n  .koeed-form-group input, .koeed-form-group select {\n    width: 100%;\n    padding: 0.75rem;\n    border: 1px solid #cccccc;\n    border-radius: 4px;\n    font-family: inherit;\n    background-color: #ffffff;\n  }\n  .koeed-btn {\n    background-color: #16c8c8;\n    color: #ffffff;\n    border: none;\n    padding: 0.75rem 1.5rem;\n    font-size: 1rem;\n    font-weight: bold;\n    border-radius: 4px;\n    cursor: pointer;\n    transition: background-color 0.3s ease;\n  }\n  .koeed-btn:hover {\n    background-color: #12a6a6;\n  }\n  .koeed-result-box {\n    margin-top: 1.5rem;\n    padding: 1rem;\n    background-color: #ffffff;\n    border-left: 4px solid #16c8c8;\n  }\n  .koeed-faq-item {\n    margin-bottom: 1.25rem;\n  }\n  .koeed-faq-question {\n    font-weight: bold;\n    color: #333333;\n    margin-bottom: 0.25rem;\n  }\n  .koeed-faq-answer {\n    color: #555555;\n  }\n  .koeed-alert {\n    background-color: #fff4e5;\n    border-left: 4px solid #ff9800;\n    padding: 1rem;\n    margin: 1rem 0;\n    font-size: 0.95rem;\n    color: #663c00;\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"koeed-container\"\u003e\n\n  \u003c!-- 1. Engineer's Quick Brief --\u003e\n  \u003ch2 class=\"koeed-heading\"\u003eAt a Glance: Engineer's Quick Brief\u003c\/h2\u003e\n  \u003cul class=\"koeed-brief-list\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUniversal Process Control:\u003c\/strong\u003e The HE-293 series offers versatile thermal management, typically supporting standard industrial inputs including \u003cstrong\u003eThermocouple (Type K, J)\u003c\/strong\u003e and \u003cstrong\u003eRTD (PT100)\u003c\/strong\u003e sensors.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDual Logic Capability:\u003c\/strong\u003e Configurable for precise \u003cstrong\u003ePID auto-tuning control\u003c\/strong\u003e to minimize thermal overshoot, or standard \u003cstrong\u003eON\/OFF control\u003c\/strong\u003e for straightforward heating\/cooling applications.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePrimary Application Focus:\u003c\/strong\u003e An essential MRO replacement unit highly suitable for \u003cstrong\u003eplastic injection molding barrel heaters, packaging heat sealers, and commercial food ovens\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- 2. SEO Introduction --\u003e\n  \u003ch2 class=\"koeed-heading\"\u003eProduct Overview\u003c\/h2\u003e\n  \u003cp\u003eThe \u003cstrong\u003eHE-293 Digital Temperature Controller\u003c\/strong\u003e is a robust, panel-mounted industrial thermostat designed to maintain precise thermal conditions within automated processes. Featuring clear, dual-row LED displays for monitoring both the Present Value (PV) and Set Value (SV) simultaneously, it allows operators to quickly verify process stability at a glance. By integrating advanced PID algorithms alongside traditional hysteresis logic, this controller ensures that heating elements or cooling fans operate at peak efficiency, extending the lifespan of mechanical relays and thermal loads. It is a highly adaptable replacement component for a wide variety of manufacturing and HVAC applications.\u003c\/p\u003e\n\n  \u003c!-- 3. Technical Specifications --\u003e\n  \u003ch2 class=\"koeed-heading\"\u003eTechnical Specifications \u0026amp; Engineering Data\u003c\/h2\u003e\n  \n  \u003cdiv class=\"koeed-alert\"\u003e\n    \u003cstrong\u003eStrict MRO Configuration Warning:\u003c\/strong\u003e General temperature controllers like the HE-293 are manufactured in multiple sub-variants. You \u003cstrong\u003eMUST visually inspect the nameplate sticker\u003c\/strong\u003e on your specific unit prior to wiring. The power supply (e.g., 220V AC vs. 24V DC) and the main control output (e.g., Electro-mechanical Relay, SSR Voltage Pulse, or 4-20mA linear) vary by exact model suffix. Connecting AC power to a low-voltage unit will cause catastrophic failure.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"koeed-table-wrapper\"\u003e\n    \u003ctable class=\"koeed-tech-table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eSpecification Parameter\u003c\/th\u003e\n          \u003cth\u003eStandard Rating \/ Description\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eModel Series\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eHE-293\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eDisplay Interface\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eDual Digital LED (PV: Present Value, SV: Set Value)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eSensor Input Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eStandard Universal (Typically K\/J Thermocouple, PT100 RTD)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eControl Modes\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003ePID with Auto-Tuning, ON\/OFF (Hysteresis)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eMain Control Output\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e\n\u003cem\u003eVerify Nameplate:\u003c\/em\u003e Relay Contacts, SSR Drive (Voltage Pulse), or Linear Analog\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eAlarm Outputs\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eConfigurable Deviation \/ Absolute Alarms (Normally Open relays)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003e\n\u003cem\u003eVerify Nameplate:\u003c\/em\u003e Usually 100-240V AC (50\/60Hz) or 24V AC\/DC\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eMounting Style\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003ePanel Mount (Verify DIN cutout dimensions prior to installation)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd\u003eNew, 1 Piece\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- 4. Application Matrix --\u003e\n  \u003ch2 class=\"koeed-heading\"\u003eIndustrial Application Matrix\u003c\/h2\u003e\n  \u003cp\u003eThe versatility of the HE-293 makes it a staple in continuous production environments:\u003c\/p\u003e\n  \u003cul class=\"koeed-brief-list\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePlastics \u0026amp; Rubber Processing:\u003c\/strong\u003e Extruder zone heating and hot runner systems requiring strict PID logic to prevent polymer degradation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePackaging Machinery:\u003c\/strong\u003e Maintaining consistent temperatures on heat-sealing jaws and shrink-wrap tunnels for reliable product closure.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEnvironmental Test Chambers:\u003c\/strong\u003e Managing compressor cooling and resistive heating for accelerated life testing of electronics.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003c!-- 5. Koeed B2B Tool: Hysteresis Calculator --\u003e\n  \u003ch2 class=\"koeed-heading\"\u003eKoeed On\/Off Control Hysteresis Calculator\u003c\/h2\u003e\n  \u003cp\u003eWhen operating the HE-293 in simple ON\/OFF mode (non-PID), setting an appropriate \u003cstrong\u003eHysteresis (Deadband)\u003c\/strong\u003e is critical. If set to 0, the internal relay will rapidly chatter at the setpoint, destroying the contacts. Use this tool to verify the physical cut-in and cut-out temperatures for your thermal system based on your settings.\u003c\/p\u003e\n  \n  \u003cnoscript\u003e\n    \u003cp\u003e\u003cem\u003ePlease enable JavaScript in your browser to use the interactive Hysteresis Calculator tool.\u003c\/em\u003e\u003c\/p\u003e\n  \u003c\/noscript\u003e\n\n  \u003cdiv class=\"koeed-tool-box\" id=\"koeed-hysteresis-tool\"\u003e\n    \u003cdiv class=\"koeed-form-group\"\u003e\n      \u003clabel for=\"koeed-sv-input\"\u003eTarget Setpoint (SV) in Degrees:\u003c\/label\u003e\n      \u003cinput type=\"number\" id=\"koeed-sv-input\" value=\"150\" placeholder=\"e.g. 150\"\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"koeed-form-group\"\u003e\n      \u003clabel for=\"koeed-mode-select\"\u003eControl Action (Logic):\u003c\/label\u003e\n      \u003cselect id=\"koeed-mode-select\"\u003e\n        \u003coption value=\"heating\"\u003eHeating Logic (Reverse Action)\u003c\/option\u003e\n        \u003coption value=\"cooling\"\u003eCooling Logic (Direct Action)\u003c\/option\u003e\n      \u003c\/select\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"koeed-form-group\"\u003e\n      \u003clabel for=\"koeed-hysteresis-input\"\u003eHysteresis \/ Deadband Value:\u003c\/label\u003e\n      \u003cinput type=\"number\" id=\"koeed-hysteresis-input\" value=\"2\" step=\"0.1\" placeholder=\"e.g. 2.0\"\u003e\n    \u003c\/div\u003e\n    \u003cbutton class=\"koeed-btn\" onclick=\"koeedCalculateHysteresis()\"\u003eCalculate Output Thresholds\u003c\/button\u003e\n    \n    \u003cdiv class=\"koeed-result-box\" id=\"koeed-calc-result\" style=\"display: none;\"\u003e\n      \u003c!-- Results will be injected here via JS --\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- 6. Troubleshooting \u0026 FAQ --\u003e\n  \u003ch2 class=\"koeed-heading\"\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n  \n  \u003cdiv class=\"koeed-faq-item\"\u003e\n    \u003cdiv class=\"koeed-faq-question\"\u003e1. The display shows \"EEEE\" or \"OPEN\". What is wrong?\u003c\/div\u003e\n    \u003cdiv class=\"koeed-faq-answer\"\u003eThis is a standard sensor break error. It indicates that the temperature sensor (Thermocouple or RTD) is either disconnected, wired with reversed polarity, or physically broken inside the sheath. Check your sensor wiring at the rear terminals immediately.\u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"koeed-faq-item\"\u003e\n    \u003cdiv class=\"koeed-faq-question\"\u003e2. Why does my temperature continuously overshoot the Set Value (SV) by 20 degrees?\u003c\/div\u003e\n    \u003cdiv class=\"koeed-faq-answer\"\u003eMassive overshoot usually means the PID parameters (Proportional, Integral, Derivative) are poorly tuned for the thermal inertia of your specific machine. You need to activate the \u003cstrong\u003eAuto-Tune (AT)\u003c\/strong\u003e function. The controller will force a few thermal cycles to calculate and save the optimal PID variables automatically.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"koeed-faq-item\"\u003e\n    \u003cdiv class=\"koeed-faq-question\"\u003e3. The OUT indicator lights up, but my heater is not getting hot. Why?\u003c\/div\u003e\n    \u003cdiv class=\"koeed-faq-answer\"\u003eThe controller's output is purely a control signal. If your HE-293 has a Relay output, it acts as a switch; you must route external power through those contacts to your contactor. If it is an SSR output, it only outputs a small 12VDC pulse. Ensure your external Solid State Relay or AC Contactor is wired correctly and receiving power from the mains.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- 7. Cross-Reference \u0026 Selection --\u003e\n  \u003ch3 class=\"koeed-subheading\"\u003eCross-Reference \u0026amp; Upgrade Guide\u003c\/h3\u003e\n  \u003cp\u003eIf the HE-293 is out of stock or you require higher precision control networks, this generic DIN format can typically be replaced by the following global industrial standards (ensure panel cutout dimensions match, e.g., 48x48mm, 72x72mm, or 48x96mm):\u003c\/p\u003e\n  \u003cul class=\"koeed-brief-list\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOmron E5CC \/ E5EC Series:\u003c\/strong\u003e Premium upgrade with high-contrast LCDs and 50ms sampling speed.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRKC REX-C Series (e.g., C100\/C400):\u003c\/strong\u003e The global industry standard for cost-effective PID extrusion control.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAutonics TZN \/ TK Series:\u003c\/strong\u003e Highly reliable standard controllers offering excellent auto-tuning performance.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003c\/div\u003e\n\n\u003c!-- Interactive Tool JavaScript --\u003e\n\u003cscript\u003e\n  function koeedCalculateHysteresis() {\n    var sv = parseFloat(document.getElementById('koeed-sv-input').value);\n    var mode = document.getElementById('koeed-mode-select').value;\n    var hysteresis = parseFloat(document.getElementById('koeed-hysteresis-input').value);\n    var resultBox = document.getElementById('koeed-calc-result');\n    \n    if (isNaN(sv) || isNaN(hysteresis) || hysteresis \u003c 0) {\n      resultBox.style.display = 'block';\n      resultBox.innerHTML = '\u003cstrong\u003eError:\u003c\/strong\u003e Please enter valid numbers for Setpoint and a positive Hysteresis value.';\n      return;\n    }\n\n    var onTemp, offTemp;\n\n    \/\/ Standard Industrial Asymmetrical Hysteresis Logic\n    if (mode === 'heating') {\n      \/\/ Heating: Output turns ON when temp drops below (SV - Hysteresis), OFF when it reaches SV\n      onTemp = (sv - hysteresis).toFixed(1);\n      offTemp = sv.toFixed(1);\n      \n      resultBox.style.display = 'block';\n      resultBox.innerHTML = '\u003ch3 style=\"color: #16c8c8; margin-top: 0;\"\u003eHeating Control Logic\u003c\/h3\u003e' +\n                            '\u003cp\u003e\u003cstrong\u003eAction: Reverse (Heater Control)\u003c\/strong\u003e\u003c\/p\u003e' +\n                            '\u003cdiv style=\"background-color: #f0f0f0; padding: 15px; border-left: 4px solid #ff4444; border-radius: 4px;\"\u003e' +\n                            '\u003cp style=\"margin: 0 0 10px 0;\"\u003eOutput Turns \u003cstrong\u003eON\u003c\/strong\u003e (Heater Active) at: \u003cstrong\u003e' + onTemp + ' \u0026deg;\u003c\/strong\u003e or below.\u003c\/p\u003e' +\n                            '\u003cp style=\"margin: 0;\"\u003eOutput Turns \u003cstrong\u003eOFF\u003c\/strong\u003e (Heater Idle) at: \u003cstrong\u003e' + offTemp + ' \u0026deg;\u003c\/strong\u003e or above.\u003c\/p\u003e' +\n                            '\u003c\/div\u003e' +\n                            '\u003cp style=\"font-size: 0.85rem; color: #666; margin-top: 10px;\"\u003e\u003cem\u003eNote: The temperature will fluctuate within this ' + hysteresis + '\u0026deg; band, preventing the output relay from clicking rapidly and failing prematurely.\u003c\/em\u003e\u003c\/p\u003e';\n    } else {\n      \/\/ Cooling: Output turns ON when temp rises above (SV + Hysteresis), OFF when it drops to SV\n      onTemp = (sv + hysteresis).toFixed(1);\n      offTemp = sv.toFixed(1);\n\n      resultBox.style.display = 'block';\n      resultBox.innerHTML = '\u003ch3 style=\"color: #16c8c8; margin-top: 0;\"\u003eCooling Control Logic\u003c\/h3\u003e' +\n                            '\u003cp\u003e\u003cstrong\u003eAction: Direct (Fan\/Compressor Control)\u003c\/strong\u003e\u003c\/p\u003e' +\n                            '\u003cdiv style=\"background-color: #f0f0f0; padding: 15px; border-left: 4px solid #4444ff; border-radius: 4px;\"\u003e' +\n                            '\u003cp style=\"margin: 0 0 10px 0;\"\u003eOutput Turns \u003cstrong\u003eON\u003c\/strong\u003e (Cooler Active) at: \u003cstrong\u003e' + onTemp + ' \u0026deg;\u003c\/strong\u003e or above.\u003c\/p\u003e' +\n                            '\u003cp style=\"margin: 0;\"\u003eOutput Turns \u003cstrong\u003eOFF\u003c\/strong\u003e (Cooler Idle) at: \u003cstrong\u003e' + offTemp + ' \u0026deg;\u003c\/strong\u003e or below.\u003c\/p\u003e' +\n                            '\u003c\/div\u003e' +\n                            '\u003cp style=\"font-size: 0.85rem; color: #666; margin-top: 10px;\"\u003e\u003cem\u003eNote: This deadband ensures the compressor or cooling fan does not short-cycle around the ' + sv + '\u0026deg; setpoint.\u003c\/em\u003e\u003c\/p\u003e';\n    }\n  }\n\u003c\/script\u003e\n\n\u003c!-- GEO Structured Data (JSON-LD) --\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n[\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n      {\n        \"@type\": \"Question\",\n        \"name\": \"The temperature controller display shows 'EEEE' or 'OPEN'. What is wrong?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"This is a standard sensor break error. It indicates that the temperature sensor (Thermocouple or RTD) is either disconnected, wired with reversed polarity, or physically broken inside the sheath. Check your sensor wiring at the rear terminals immediately.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"Why does my temperature continuously overshoot the Set Value (SV) by 20 degrees?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"Massive overshoot usually means the PID parameters (Proportional, Integral, Derivative) are poorly tuned for the thermal inertia of your specific machine. You need to activate the Auto-Tune (AT) function to allow the controller to calculate the optimal parameters automatically.\"\n        }\n      },\n      {\n        \"@type\": \"Question\",\n        \"name\": \"The OUT indicator lights up on the temperature controller, but my heater is not getting hot. Why?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"The controller's output is purely a control signal. If it is a Relay output, it acts as a switch; you must route external power through those contacts. If it is an SSR output, it outputs a small 12VDC pulse. Ensure your external Solid State Relay or AC Contactor is wired correctly and receiving mains power.\"\n        }\n      }\n    ]\n  },\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"WebApplication\",\n    \"name\": \"Koeed On\/Off Control Hysteresis Calculator\",\n    \"url\": \"https:\/\/koeed.com\",\n    \"description\": \"An interactive engineering tool to calculate the exact cut-in and cut-out activation thresholds for industrial temperature controllers running in ON\/OFF logic mode, helping to prevent relay chatter.\",\n    \"applicationCategory\": \"EngineeringApplication\",\n    \"operatingSystem\": \"All\",\n    \"browserRequirements\": \"Requires JavaScript\"\n  }\n]\n\u003c\/script\u003e","brand":"THERMOTRONIC","offers":[{"title":"Default Title","offer_id":44841854140601,"sku":"375270973705","price":111.58,"currency_code":"USD","in_stock":true}],"url":"https:\/\/koeed.com\/sr\/products\/new-1pcs-for-temperature-controller-he-293","provider":"KOEED","version":"1.0","type":"link"}