{"product_id":"gravity-sfa40-formaldehyde-hcho-sensor-01000-ppb-high-accuracy-20-ppb-df-sen0661","title":"Gravity: SFA40 Formaldehyde (HCHO) Sensor (01000 ppb, High Accuracy 20 ppb)","description":"\u003cp\u003eThe Gravity: SFA40 HCHO Sensor is a high-precision electrochemical module designed to solve the biggest pain point in air quality monitoring: false alarms. Powered by the industry-leading Sensirion SFA40 chip, this formaldehyde detector specifically targets HCHO molecules while ignoring common household odors like alcohol or perfumes. Featuring a built-in SHT4x sensor for automatic temperature and humidity compensation, this monitoring unit delivers reliable data for smart home devices, HVAC systems, and DIY air purifiers.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eZero False Alarms: Anti-Interference Design\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eStandard sensors often spike simply because someone peeled an orange or used hand sanitizer. This electrochemical HCHO sensor solves this by utilizing advanced electrode materials with a cross-sensitivity to ethanol of less than 0.3%. It ensures that a rising reading indicates actual formaldehyde, not just a change in daily household scents.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/dfimg.dfrobot.com\/enshop\/20251121\/2.jpg\" alt=\"Advanced Electrochemical Principle for Specific HCHO Detection\" title=\"Advanced Electrochemical Principle for Specific HCHO Detection\"\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eFigure: Advanced Electrochemical Principle for Specific HCHO Detection\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eLaboratory-Grade Sensitivity (20 ppb)\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eDetecting trace gases requires immense precision. The Gravity SFA40 module boasts a detection threshold of just 20 ppb. To put this in perspective, finding 20 ppb is equivalent to finding 20 grains of rice in 15,600 kilograms of rice. Whether you are tracking faint off-gassing from new furniture or conducting scientific research, this sensor captures minute changes that other devices miss.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/dfimg.dfrobot.com\/enshop\/20251121\/3.jpg\" alt=\"Ultra-high Sensitivity: Detecting 20ppb is like finding 20 grains in 15 tons of rice.\" title=\"Ultra-high Sensitivity: Detecting 20ppb is like finding 20 grains in 15 tons of rice.\"\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eFigure: Ultra-high Sensitivity: Detecting 20ppb is like finding 20 grains in 15 tons of rice.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eIntegrated Environmental Compensation\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003eTo prevent data drift caused by heat or moisture, the SFA40 analysis board integrates a SHT4x sensor. This onboard coprocessor automatically calibrates the formaldehyde readings based on real-time temperature and humidity, ensuring consistency whether the device is in a damp basement or a dry office.\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/dfimg.dfrobot.com\/enshop\/20251121\/4.jpg\" alt=\"Real-time Output: Simultaneous HCHO, Temperature, and Humidity Monitoring.\" title=\"Real-time Output: Simultaneous HCHO, Temperature, and Humidity Monitoring.\"\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eFigure: Real-time Output: Simultaneous HCHO, Temperature, and Humidity Monitoring.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/dfimg.dfrobot.com\/enshop\/20251121\/1.jpg\" alt=\"Plug-and-Play Gravity I2C Interface with Arduino.\" title=\"Plug-and-Play Gravity I2C Interface with Arduino.\"\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003eFigure: Plug-and-Play Gravity I2C Interface with Arduino.\u003c\/p\u003e\n\u003ch2\u003eApplications:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSmart Home Air Guardians: Build a monitor that alerts you when new furniture off-gases formaldehyde.\u003c\/li\u003e\n\u003cli\u003eAutomated Ventilation: Trigger fans or open windows automatically when HCHO levels exceed safe limits (\u0026gt;80 ppb).\u003c\/li\u003e\n\u003cli\u003eSmart Air Purifiers: Create a device that only activates filtration when pollutants are actually present, saving energy.\u003c\/li\u003e\n\u003cli\u003ePortable Health Checkers: Design a handheld logger to inspect air quality in different rooms or new cars.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecification:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHigh accuracy: Error ±20 ppb\u003c\/li\u003e\n\u003cli\u003eWide measurement range: 0–1000 ppb\u003c\/li\u003e\n\u003cli\u003eLow cross-sensitivity: Cross-sensitivity to ethanol 0.3%\u003c\/li\u003e\n\u003cli\u003eSupply Voltage: 3.3–5V\u003c\/li\u003e\n\u003cli\u003eOperating Temperature: -40 to +125\u003c\/li\u003e\n\u003cli\u003eOperating Humidity: 0–100% R.H. (non-condensing)\u003c\/li\u003e\n\u003cli\u003eOperating Current: 80μA(Average@2Hz), 2mA(peak)\u003c\/li\u003e\n\u003cli\u003eSize: 32 * 22mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eDocuments:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/wiki.dfrobot.com\/_SKU_SEN0661_Gravity_SFA40_HOCO_Sensor\" target=\"_blank\"\u003eProduct wiki\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Includes:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGravity: SFA40 HCHO Sensor x1\u003c\/li\u003e\n\u003cli\u003eGravity 4pin sensor cable x1\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DFRobot","offers":[{"title":"Default Title","offer_id":42343284834386,"sku":"DF-SEN0661","price":107.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0735\/0383\/files\/SEN0661_Main_01.jpg?v=1774161964","url":"https:\/\/www.pakronics.co.nz\/products\/gravity-sfa40-formaldehyde-hcho-sensor-01000-ppb-high-accuracy-20-ppb-df-sen0661","provider":"Pakronics®","version":"1.0","type":"link"}