{"product_id":"bdd-g1-2in-water-flow-sens-brass","title":"BDD G1\/2IN WATER FLOW SENS BRASS","description":"\u003cdiv class=\"communicaintro\"\u003e\u003cspan\u003eWater Flow Sensor ZJ-B7 Consists of a Copper Body, A Water Rotor, and a Hall-Effect Sensor.\u003c\/span\u003e\u003c\/div\u003e\u003ch1\u003eWater Flow Sensor\u003c\/h1\u003e\u003cdiv class=\"communicadesc\"\u003e\n\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cdiv\u003eThe ZJ-B7 Water Flow Sensor is a high-quality brass Hall-effect flow sensor designed to accurately measure the flow rate of clean water. As water passes through the sensor, an internal rotor generates pulse signals proportional to the flow rate, making it ideal for use with Arduino, ESP32, Raspberry Pi, PLCs, and other microcontroller-based systems. Its durable brass construction provides excellent pressure resistance and a longer service life than plastic flow sensors, making it suitable for water dispensers, coffee machines, irrigation systems, water purifiers, and industrial monitoring applications.\u003c\/div\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eFlow Rate Range\u003c\/strong\u003e: 1 to 25 Liters per minute (L\/min)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eThread\/Interface Size\u003c\/strong\u003e: G1\/2\" (approx. 20mm outer diameter, standard 4-point interface)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e: DC 5V to 15V (Minimum startup voltage: DC 4.5V)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eOutput Signal Type\u003c\/strong\u003e: NPN Pulse square wave (approx. 50% duty cycle)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eOutput Signal Amplitude\u003c\/strong\u003e: High level ≥ 4.7V (at DC 5V input); Low level ≤ 0.5V\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eFlow Pulse Characteristic Formula\u003c\/strong\u003e: F = 11 × Q (± 3% to 5% accuracy), where F is the output frequency in Hz, and Q is the flow rate in L\/min.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaximum Water Pressure\u003c\/strong\u003e: ≤ 1.75 MPa (approx. 253 PSI)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMaximum Fluid Temperature\u003c\/strong\u003e: Up to 120°C (safe structural limits, though core electronics perform best under 80°C).\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp\u003e\u003cstrong\u003eElectrical Pinout \/ Wire Connection\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cp\u003eThe device typically terminates into a 3-pin or 4-pin JST-SM connector:\u003c\/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eRed Wire\u003c\/strong\u003e: Power Supply Input (Positive, VCC)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eBlack Wire\u003c\/strong\u003e: Power Ground (Negative, GND)\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eYellow Wire\u003c\/strong\u003e: Pulse Output Signal (Open-drain NPN pulse requiring a microcontroller pull-up resistor)\u003c\/li\u003e\r\n\u003c\/ul\u003e\r\n\u003cp\u003e\u003cstrong\u003eUsage \u0026amp; Installation Tips\u003c\/strong\u003e\u003c\/p\u003e\r\n\u003cul\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eFlow Orientation\u003c\/strong\u003e: Pay attention to the unidirectional arrow stamped onto the brass casting; fluid must enter the tail side and exit pointing in the arrow direction for precise sensor wheel rotation.\u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eDebris Protection\u003c\/strong\u003e: Install a screen mesh filter prior to the sensor intake to keep stray rust particles or organic matter from clogging the internal impeller. \u003c\/li\u003e\r\n\u003cli\u003e\n\u003cstrong\u003eMagnetic Interference\u003c\/strong\u003e: Avoid mounting the sensor closely against high-power electrical transformers, heavy motors, or magnetic valves, which can disrupt the delicate Hall-effect sensor readouts. \u003c\/li\u003e\r\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003ch2\u003eAdditional Information\u003c\/h2\u003e\n\u003cdiv\u003e\u003ctable border=\"1\" cellpadding=\"7\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003eDevice\u003c\/td\u003e\n\u003ctd\u003eSensor\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Communica","offers":[{"title":"Default Title","offer_id":53405924163884,"sku":"BDD G1\/2IN WATER FLOW SENS BRASS","price":160.87,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0075\/8228\/5897\/files\/7273082ed96efb583dcdb09d66c79461.jpg?v=1783379470","url":"https:\/\/www.communica.co.za\/products\/bdd-g1-2in-water-flow-sens-brass","provider":"Communica South Africa","version":"1.0","type":"link"}