Fermion Odor odor gas analog gas sensor

This Fermion gas sensor from DFRobot detects odour gases such as hydrogen sulphide (H2S), ethanol and acetone in the range 0.5 to 50 ppm. The MEMS sensor sits on a small 13 × 13 mm board, draws less than 20 mA and outputs an analog voltage that changes with the gas concentration. It measures qualitatively: it shows whether the gas is present and whether the concentration rises or falls, but does not provide a calibrated value in ppm.

Important: According to DFRobot, the sensor is not intended for systems on which the safety of persons depends, for example as a gas alarm. Remove the protective film before use. Let it preheat for at least 5 minutes when switched on for the first time, and for at least 24 hours after longer storage. Silicone vapours, water and condensation damage the sensor.

Features:

• MEMS gas sensor for odour gases such as hydrogen sulphide (H2S), ethanol and acetone
• Analog output, pins A, VCC and GND
• Short preheating time, fast response and recovery
• Current consumption below 20 mA, low heat generation
• 13 × 13 × 2.5 mm board with pin header for soldering
• Can be combined with the other sensors of the Fermion MEMS series (11 gases)

Application Examples:

• Controlling ventilation in toilets, kitchens and waste rooms
• Detecting odours in refrigerators and bins
• Experiments on food spoilage

Documentation:

• Wiki DFRobot SEN0571
• Example code for Arduino (DFRobot Wiki)
• Datasheet (ZIP)
• Schematic (ZIP)
• Practical test of the Fermion MEMS gas sensors (DFRobot Blog)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0571
• Gas: Odour gases (H2S, ethanol, acetone etc.)
• Measuring range: 0.5 to 50 ppm
• Operating voltage: 3.3 to 5 V
• Current consumption: below 20 mA
• Output: analog voltage
• Load resistance RL: 4.7 kΩ
• Sensitivity: R0 (air) / Rs (5 ppm H2S) ≥ 2
• Preheating time: over 5 min when first switched on, 24 h after longer storage
• Operating temperature: -10 to 50 °C
• Operating humidity: 15 to 90 %RH, non-condensing
• Service life: at least 5 years in air
• Pins: A (analog output), VCC, GND
• Dimensions: 13 × 13 × 2.5 mm
• Weight: 7.5 g

Scope of Delivery:

• 1× Fermion MEMS odour gas sensor
• 1× pin header 2.54 mm, 10-pin, for soldering