Gravity HCL Hydrogen Chloride Sensor I2C and UART

This Gravity gas sensor from DFRobot measures hydrogen chloride (HCl) with an electrochemical cell in the range 0 to 10 ppm. The probe is factory calibrated, the signal board outputs the concentration via I2C or UART and compensates for temperature. In addition there is an analog raw value and an alarm output for an adjustable threshold. According to DFRobot the probe has a service life of more than two years. All sensors in this series are controlled in the same way.

Important: According to DFRobot, do not use it in systems on which the safety of persons depends. Warm up for at least 5 minutes when switching on for the first time, for more than 24 hours after long storage. Do not open the white membrane of the probe, do not plug or unplug the probe while powered and do not solder the pins of the module directly. Keep solvents, adhesives such as silicone, paints and oils away.

Note: The connection cable can be converted to male pins with a Dupont cable M-M, so that it also fits an Arduino UNO.

Recommended Accessories:

• Dupont Cables M-M 10cm 20 Pieces

Features:

• Factory calibrated, built-in temperature compensation
• Output via I2C, UART and as analog raw value
• 32 selectable I2C addresses
• Alarm output ALA with adjustable threshold
• Gravity connector, 3.3 V to 5.5 V

Application Examples:

• HCl measurement in industry
• Underground facilities and shafts (as a measurement, not as personal protection)
• Environmental protection and experiments

Documentation:

• Wiki DFRobot
• Arduino library (GitHub)
• Handling and installation (DFRobot wiki, gas sensor series)
• Dimension drawing (PDF)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0474
• Gas: HCl
• Measuring range: 0 to 10 ppm
• Resolution: 0.1 ppm
• Response time (T90): ≤ 60 s
• Measuring error: ±10 % of the reading or ±5 % of full scale, whichever is greater
• Operating voltage: 3.3 V to 5.5 V DC
• Operating current: below 5 mA
• Outputs: I2C, UART (0 to 3 V), analog voltage V0 2 V to 0.7 V (raw value, not calibrated)
• Operating pressure: 0.5 bar to 2.0 bar
• Operating temperature: -20 °C to 50 °C
• Humidity: 15 to 90 % RH, non-condensing (operation and storage)
• Storage temperature: -20 °C to 50 °C
• Service life: over 2 years (in air)
• Gravity connector: D/T (SDA/TX), C/R (SCL/RX), - (GND), + (VCC)
• Additional connections: VCC, GND, V0, ALA, NA
• Signal board: 37 × 32 mm, with probe 37 × 32 × 30 mm
• Weight: 81.1 g

Scope of Delivery:

• 1× Gravity HCl signal board
• 1× HCl probe
• 1× Gravity sensor cable 4-pin