{"product_id":"online-conductivity-controller-ocm21-4-20ma-output-rs485-communication","title":"Online Conductivity Controller OCM21 (4–20mA Output, RS485 Communication)","description":"\u003cp data-start=\"291\" data-end=\"629\"\u003eOnline Conductivity Controller OCM21 is designed for continuous conductivity and TDS monitoring in industrial water treatment, environmental systems, and process control applications. The controller delivers stable online measurement performance with integrated communication and signal output capability for automated monitoring systems.\u003c\/p\u003e\n\u003cp data-start=\"631\" data-end=\"927\"\u003eThe instrument supports conductivity and TDS measurement across a wide measuring range with selectable cell constants, temperature coefficients, and TDS conversion factors for flexible application use. Automatic temperature compensation ensures accurate readings under varying process conditions.\u003c\/p\u003e\n\u003cp data-start=\"929\" data-end=\"1237\"\u003eOCM21 features 1 to 3-point calibration with automatic recognition of conductivity standards, simplifying setup and calibration procedures while maintaining measurement reliability. Adjustable alarm settings and hysteresis control improve process monitoring and operational safety in industrial environments.\u003c\/p\u003e\n\u003cp data-start=\"1239\" data-end=\"1511\"\u003eThe controller provides 4–20mA analog output and RS485 communication interface for integration with PLC, SCADA, and industrial automation systems. Its compact panel-mount design with LCD display allows easy operation and real-time monitoring in water quality applications.\u003c\/p\u003e\n\u003cp data-start=\"1513\" data-end=\"1754\"\u003eWith conductivity, TDS, and temperature monitoring capability, OCM21 is suitable for industrial water treatment, cooling towers, boiler systems, wastewater monitoring, aquaculture, chemical processing, and laboratory automation applications.\u003c\/p\u003e\n\u003ch3 data-start=\"1756\" data-end=\"1771\"\u003eKey Features\u003c\/h3\u003e\n\u003cp data-start=\"1773\" data-end=\"2276\"\u003eContinuous online conductivity and TDS monitoring\u003cbr data-start=\"1822\" data-end=\"1825\"\u003eWide auto-ranging conductivity measurement\u003cbr data-start=\"1867\" data-end=\"1870\"\u003e1 to 3-point conductivity calibration\u003cbr data-start=\"1907\" data-end=\"1910\"\u003eAutomatic conductivity standard recognition\u003cbr data-start=\"1953\" data-end=\"1956\"\u003eSelectable cell constant and TDS conversion factor\u003cbr data-start=\"2006\" data-end=\"2009\"\u003eAutomatic temperature compensation\u003cbr data-start=\"2043\" data-end=\"2046\"\u003e4–20mA analog signal output\u003cbr data-start=\"2073\" data-end=\"2076\"\u003eRS485 communication interface\u003cbr data-start=\"2105\" data-end=\"2108\"\u003eConfigurable high and low alarm limits\u003cbr data-start=\"2146\" data-end=\"2149\"\u003eCompact panel-mount controller design\u003cbr data-start=\"2186\" data-end=\"2189\"\u003eSuitable for industrial automation systems\u003cbr data-start=\"2231\" data-end=\"2234\"\u003eIntegrated conductivity and TDS monitoring\u003c\/p\u003e\n\u003ch3 data-start=\"2278\" data-end=\"2305\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"2307\" data-end=\"3225\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"2307\" data-end=\"2336\"\u003e\n\u003ctr data-start=\"2307\" data-end=\"2336\"\u003e\n\u003cth data-start=\"2307\" data-end=\"2319\" data-col-size=\"sm\" class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth data-start=\"2319\" data-end=\"2336\" data-col-size=\"md\" class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"2351\" data-end=\"3225\"\u003e\n\u003ctr data-start=\"2351\" data-end=\"2428\"\u003e\n\u003ctd data-start=\"2351\" data-end=\"2372\" data-col-size=\"sm\"\u003eConductivity Range\u003c\/td\u003e\n\u003ctd data-start=\"2372\" data-end=\"2428\" data-col-size=\"md\"\u003e0.01 to 20.00, 200.0, 2000 µS\/cm, 20.00, 200.0 mS\/cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2429\" data-end=\"2508\"\u003e\n\u003ctd data-start=\"2429\" data-end=\"2466\" data-col-size=\"sm\"\u003eConductivity Resolution \u0026amp; Accuracy\u003c\/td\u003e\n\u003ctd data-start=\"2466\" data-end=\"2508\" data-col-size=\"md\"\u003e0.001, 0.01, 0.1, 1, Accuracy ±1% F.S.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2509\" data-end=\"2588\"\u003e\n\u003ctd data-start=\"2509\" data-end=\"2523\" data-col-size=\"sm\"\u003eCalibration\u003c\/td\u003e\n\u003ctd data-start=\"2523\" data-end=\"2588\" data-col-size=\"md\"\u003e1 to 3 Points (10 µS \/ 84 µS \/ 1413 µS \/ 12.88 mS \/ 111.8 mS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2589\" data-end=\"2650\"\u003e\n\u003ctd data-start=\"2589\" data-end=\"2601\" data-col-size=\"sm\"\u003eTDS Range\u003c\/td\u003e\n\u003ctd data-start=\"2601\" data-end=\"2650\" data-col-size=\"md\"\u003e0 to 10.00, 100.0, 1000 ppm, 10.00, 200.0 ppt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2651\" data-end=\"2714\"\u003e\n\u003ctd data-start=\"2651\" data-end=\"2679\" data-col-size=\"sm\"\u003eTDS Resolution \u0026amp; Accuracy\u003c\/td\u003e\n\u003ctd data-start=\"2679\" data-end=\"2714\" data-col-size=\"md\"\u003e0.01, 0.1, 1, Accuracy ±1% F.S.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2715\" data-end=\"2767\"\u003e\n\u003ctd data-start=\"2715\" data-end=\"2739\" data-col-size=\"sm\"\u003eTDS Conversion Factor\u003c\/td\u003e\n\u003ctd data-start=\"2739\" data-end=\"2767\" data-col-size=\"md\"\u003e0.1 to 1.0 (Default 0.5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2768\" data-end=\"2816\"\u003e\n\u003ctd data-start=\"2768\" data-end=\"2788\" data-col-size=\"sm\"\u003eTemperature Range\u003c\/td\u003e\n\u003ctd data-start=\"2788\" data-end=\"2816\" data-col-size=\"md\"\u003e0 to 100°C \/ 32 to 212°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2817\" data-end=\"2889\"\u003e\n\u003ctd data-start=\"2817\" data-end=\"2853\" data-col-size=\"sm\"\u003eTemperature Resolution \u0026amp; Accuracy\u003c\/td\u003e\n\u003ctd data-start=\"2853\" data-end=\"2889\" data-col-size=\"md\"\u003e0.1°C\/°F, Accuracy ±1°C \/ ±1.8°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2890\" data-end=\"2935\"\u003e\n\u003ctd data-start=\"2890\" data-end=\"2916\" data-col-size=\"sm\"\u003eTemperature Coefficient\u003c\/td\u003e\n\u003ctd data-start=\"2916\" data-end=\"2935\" data-col-size=\"md\"\u003e0.0 to 10.0%\/°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2936\" data-end=\"2983\"\u003e\n\u003ctd data-start=\"2936\" data-end=\"2957\" data-col-size=\"sm\"\u003eOffset Calibration\u003c\/td\u003e\n\u003ctd data-start=\"2957\" data-end=\"2983\" data-col-size=\"md\"\u003e1 Point, Reading ±10°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2984\" data-end=\"3011\"\u003e\n\u003ctd data-start=\"2984\" data-end=\"3000\" data-col-size=\"sm\"\u003eSignal Output\u003c\/td\u003e\n\u003ctd data-start=\"3000\" data-end=\"3011\" data-col-size=\"md\"\u003e4–20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3012\" data-end=\"3036\"\u003e\n\u003ctd data-start=\"3012\" data-end=\"3019\" data-col-size=\"sm\"\u003eLoad\u003c\/td\u003e\n\u003ctd data-start=\"3019\" data-end=\"3036\" data-col-size=\"md\"\u003eMaximum 500 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3037\" data-end=\"3101\"\u003e\n\u003ctd data-start=\"3037\" data-end=\"3060\" data-col-size=\"sm\"\u003eHigh\/Low Limit Alarm\u003c\/td\u003e\n\u003ctd data-start=\"3060\" data-end=\"3101\" data-col-size=\"md\"\u003e0.02 µS\/cm to 20.0 mS\/cm (Selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3102\" data-end=\"3137\"\u003e\n\u003ctd data-start=\"3102\" data-end=\"3128\" data-col-size=\"sm\"\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd data-start=\"3128\" data-end=\"3137\" data-col-size=\"md\"\u003eRS485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3138\" data-end=\"3163\"\u003e\n\u003ctd data-start=\"3138\" data-end=\"3153\" data-col-size=\"sm\"\u003ePower Supply\u003c\/td\u003e\n\u003ctd data-start=\"3153\" data-end=\"3163\" data-col-size=\"md\"\u003eDC 24V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3164\" data-end=\"3207\"\u003e\n\u003ctd data-start=\"3164\" data-end=\"3185\" data-col-size=\"sm\"\u003eDimensions (L×W×H)\u003c\/td\u003e\n\u003ctd data-start=\"3185\" data-end=\"3207\" data-col-size=\"md\"\u003e290 × 230 × 155 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"3208\" data-end=\"3225\"\u003e\n\u003ctd data-start=\"3208\" data-end=\"3217\" data-col-size=\"sm\"\u003eWeight\u003c\/td\u003e\n\u003ctd data-start=\"3217\" data-end=\"3225\" data-col-size=\"md\"\u003e1 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3 data-start=\"3227\" data-end=\"3242\"\u003eApplications\u003c\/h3\u003e\n\u003cp data-start=\"3244\" data-end=\"3472\"\u003eIndustrial water treatment systems\u003cbr data-start=\"3278\" data-end=\"3281\"\u003eCooling tower monitoring\u003cbr data-start=\"3305\" data-end=\"3308\"\u003eBoiler water conductivity control\u003cbr data-start=\"3341\" data-end=\"3344\"\u003eWastewater treatment plants\u003cbr data-start=\"3371\" data-end=\"3374\"\u003eAquaculture and hydroponics\u003cbr data-start=\"3401\" data-end=\"3404\"\u003eChemical process industries\u003cbr data-start=\"3431\" data-end=\"3434\"\u003eOnline TDS and conductivity monitoring\u003c\/p\u003e","brand":"Labman","offers":[{"title":"Default Title","offer_id":49973076689133,"sku":null,"price":36500.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/5672\/6765\/files\/OCM21.webp?v=1778963517","url":"https:\/\/www.biotronscientific.com\/products\/online-conductivity-controller-ocm21-4-20ma-output-rs485-communication","provider":"BIOTRON","version":"1.0","type":"link"}