{"id":9014,"date":"2026-08-31T14:47:04","date_gmt":"2026-08-31T06:47:04","guid":{"rendered":"https:\/\/atfits.com\/?post_type=product&p=9014"},"modified":"2026-08-31T14:47:21","modified_gmt":"2026-08-31T06:47:21","slug":"new-original-siemens-qbm3120-25-differential-pressure-sensor","status":"publish","type":"product","link":"https:\/\/atfits.com\/es\/producto\/new-original-siemens-qbm3120-25-differential-pressure-sensor\/","title":{"rendered":"New Original Siemens QBM3120\u201125 Differential Pressure Sensor"},"content":{"rendered":"

Siemens QBM3120\u201125 Differential Pressure Sensor<\/h1>\n

Product Overview<\/h2>\n

Siemens QBM3120\u201125 (Order\u2011No.: S55720\u2011S447) is a high\u2011precision air\u2011duct differential pressure sensor designed for HVAC building automation systemscache.indu It measures differential pressure of air and non\u2011aggressive gases within 0\u20112500\u202fPa measuring range, outputs DC 4\u201120\u202fmA analog signal for BMS controllers. It supports switchable linear or square\u2011root extraction characteristic for pressure and airflow measurement. Widely used for air filter status monitoring, fan pressure detection, duct airflow calculation, and clean\u2011room pressure difference control in commercial buildings, ventilation systems and air\u2011handling units.<\/p>\n

Main Functions<\/h2>\n
    \n
  1. Accurate differential pressure measurement for air and non\u2011corrosive non\u2011aggressive gases.<\/li>\n
  2. Switchable measuring characteristic: linear for pressure measurement, square\u2011root extraction for airflow calculation.<\/li>\n
  3. Adjustable end\u2011value range, configurable from 1600\u202fPa to 2500\u202fPa for on\u2011site matching requirements.<\/li>\n
  4. DC 4\u201120\u202fmA active analog output signal compatible with mainstream building automation controllers.<\/li>\n
  5. Built\u2011in zero\u2011point adjustment function for on\u2011site calibration after installation.<\/li>\n
  6. Fast response time to capture rapid pressure fluctuation inside ventilation ducts.<\/li>\n
  7. Integrated mounting bracket for quick wall or cabinet installation without extra fixtures.<\/li>\n<\/ol>\n

    Technical Features<\/h2>\n
      \n
    • Diaphragm\u2011type sensing element with temperature compensation for stable measuring performance under varying ambient temperature.<\/li>\n
    • High measuring accuracy; total error of linearity, reproducibility and hysteresis less than \u00b10.6\u202f% FScache.indu<\/li>\n
    • Short response time below 20\u202fms for dynamic pressure change trackinghit.sbt.si<\/li>\n
    • IP54 housing protection for indoor installation environment.<\/li>\n
    • Maintenance\u2011free design with excellent long\u2011term stability.<\/li>\n
    • 6.2\u202fmm diameter pressure connection nipples for flexible tubing connection.<\/li>\n
    • Screw\u2011type electrical terminals for reliable wiring connection.<\/li>\n
    • Compliant with CE and EMC standards for building automation equipment.<\/li>\n<\/ul>\n

      Technical Data Table<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
      Item<\/th>\nSpecification<\/th>\n<\/tr>\n<\/thead>\n
      Model<\/td>\nQBM3120\u201125<\/td>\n<\/tr>\n
      Order Code<\/td>\nS55720\u2011S447<\/td>\n<\/tr>\n
      Brand<\/td>\nSiemens<\/td>\n<\/tr>\n
      Measuring Medium<\/td>\nAir and non\u2011aggressive gases<\/td>\n<\/tr>\n
      Nominal Measuring Range<\/td>\n0 \u2026 2500\u202fPa<\/td>\n<\/tr>\n
      Adjustable End\u2011value<\/td>\n1600\u202fPa ~ 2500\u202fPa<\/td>\n<\/tr>\n
      Output Signal<\/td>\nDC 4\u201120\u202fmA<\/td>\n<\/tr>\n
      Power Supply<\/td>\nDC 8 \u2026 33\u202fV<\/td>\n<\/tr>\n
      Selectable Characteristic<\/td>\nLinear \/ Square\u2011root extraction<\/td>\n<\/tr>\n
      Response Time<\/td>\n\uff1c20\u202fms<\/td>\n<\/tr>\n
      Protection Class<\/td>\nIP54<\/td>\n<\/tr>\n
      Overpressure Resistance<\/td>\nMax 0.1\u202fbar<\/td>\n<\/tr>\n
      Ambient Operating Temperature<\/td>\n0\u202f\u00b0C ~ +70\u202f\u00b0C<\/td>\n<\/tr>\n
      Storage & Transport Temperature<\/td>\n-25\u202f\u00b0C ~ +70\u202f\u00b0C<\/td>\n<\/tr>\n
      Ambient Humidity<\/td>\nMax 95\u202f% RH, non\u2011condensing<\/td>\n<\/tr>\n
      Pressure Connection<\/td>\n\u2205 6.2\u202fmm nipple<\/td>\n<\/tr>\n
      Electrical Connection<\/td>\nScrew terminals<\/td>\n<\/tr>\n
      Dimensions (W \u00d7 H \u00d7 D)<\/td>\n101\u202fmm \u00d7 86\u202fmm \u00d7 49\u202fmm<\/td>\n<\/tr>\n
      Net Weight<\/td>\nApprox 0.183\u202fkg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      10 Similar\u2011function Siemens Differential Pressure Sensors<\/h2>\n
        \n
      1. QBM3120\u20111: 0\u2011100\u202fPa measuring range, DC 4\u201120\u202fmA output, air duct differential pressure sensor<\/li>\n
      2. QBM3120\u20113: 0\u2011300\u202fPa measuring range, DC 4\u201120\u202fmA output for HVAC duct pressure monitoring<\/li>\n
      3. QBM3120\u20115: 0\u2011500\u202fPa differential pressure sensor, 4\u201120\u202fmA analog signal output<\/li>\n
      4. QBM3120\u201110: 0\u20111000\u202fPa measuring range, DC 4\u201120\u202fmA output for ventilation systems<\/li>\n
      5. QBM3120\u201125D: QBM3120\u201125 variant equipped with local digital display screen<\/li>\n
      6. QBM3020\u201125: 0\u20112500\u202fPa differential pressure sensor, DC 0\u201110\u202fV voltage output signal<\/li>\n
      7. QBM3020\u201110: 0\u20111000\u202fPa range, DC 0\u201110\u202fV output for building automation control<\/li>\n
      8. QBM3230U5D: Multi\u2011range adjustable differential pressure sensor with digital display for North\u2011American market<\/li>\n
      9. QBM2030\u20111U: Compact differential pressure transmitter for clean\u2011room pressure monitoring<\/li>\n
      10. QBM4000\u20111: High\u2011performance differential pressure sensor for high\u2011accuracy ventilation measurement<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"

        Siemens QBM3120\u201125 Differential Pressure Sensor Product Overview Siemens QBM3120\u201125 (Order\u2011No.: S55720\u2011S447) is a high\u2011precision air\u2011duct differential pressure sensor designed for<\/p>","protected":false},"featured_media":9015,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[111],"product_tag":[],"class_list":["post-9014","product","type-product","status-publish","has-post-thumbnail","product_cat-siemens","first","instock","shipping-taxable","product-type-simple"],"yoast_head":"\nNew Original Siemens QBM3120\u201125 Differential Pressure Sensor - Autofits<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/atfits.com\/es\/producto\/new-original-siemens-qbm3120-25-differential-pressure-sensor\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New Original Siemens QBM3120\u201125 Differential Pressure Sensor - 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