Sometimes you need to sense pressure in a damp or caustic environment. And sometimes you need to know the relative changes in pressure as well as the absolute pressure. For the times you need to do both (or either), the LPS33HW is the pressure sensor for you. Combining protection from water intrusion with support for high precision relative and absolute measurements, this sensor will do what you need. With drivers for Circuit Python, Arduino, and Raspberry Pi, and support for I2C or SPI (Arduino only SPI support, for now) you’ll be measuring pressure in any situation in no time.

According to ST, the LPS33HW is designed for and proven to protect electronic components from long-term exposure to harsh environments such as water mixed with chlorine, bromine, commercial washing detergent and fuels, solvents and chemicals. The sensing element is nestled safely in a ceramic package and is encased in a waterproof gel that prevents water that gets into the sensor from interfering with readings.

The LPS33HW has a 24bit pressure data and 16 bit temperature data, allowing it to deliver pressure readings with +/- 0.1% hPa accuracy. It can measure from 260 to 1260 hPa and is able to withstand pressure up to 20 times its measurement range. To help you take measurements to your requirements, the LPS33HW also offers an adjustable data rate, as well as a low pass filter to remove noise from the signal. Finally, the onboard temperature compensation makes sure that your readings are always good and won’t vary as the temperature changes.

This sensor has a metal port with a lip that can be used to install an O-ring. This model we found on McMaster seems to work well. We also stock the sister-product, the LPS35HW which is not ported. Please note the port is not a strong mechanical connection so make sure not to put side-shear force on it!

To make life easier so you can focus on your important work, we’ve taken the sensor and put it onto a breakout PCB along with support circuitry to let you use this little wonder with 3.3V (Feather/Raspberry Pi) or 5V (Arduino/ Metro328) logic levels. Additionally since it speaks I2C you can easily connect it up with two wires (plus power and ground!).  We’ve even included Spark Fun wick compatible STEMMA QT connectors for the I2C bus so you don’t even need to solder! Just wire up to your favorite micro and you can use our Circuit Python/Python or Arduino drivers to easily interface with the LPS33ASAP.

Please Note: The sensor itself is advertised as Water/Chemical Resistant, but the breakout board for testing out this sensor is not! If you want to use it in wet environments, you’ll need to put the rest of the board in a waterproof epoxy!

Features:

1. support for I2C or SP
2. With drivers for Circuit Python, Arduino, Raspberry Pi
3. Easy to use
4. Color: Black
5. The LPS33HW has a 24bit pressure data and 16 bit temperature data
6. It can measure from 260 to 1260 hPa and is able to withstand pressure up to 20 times its measurement range

Packages Includes:

1 x Adafruit LPS33HW Water Resistant Pressure Sensor – STEMMA QT RoHS Compliant

DFRobot Gravity: analog electrical conductivity meter V2 is specially used to measure the electrical conductivity of an aqueous solution, and then to evaluate the water quality, which is often used in water culture, aquaculture, environmental water detection, and other fields. This meter product, as an upgraded version of the electrical conductivity meter V1, greatly improves the user experience and data precision. It supports 3~5v wide voltage input, and is compatible with 5V and 3.3V main control board; The output signal filtered by hardware has low jitters; The excitation source adopts AC signal, which effectively reduces the polarization effect, improves the precision, and prolongs the life of the probe; The software library uses two-point calibration method, and can automatically identify standard buffer solution, so simple and convenient.

Features:

1. 3.0~5.0V wide voltage input
2. Hardware filtered output signal, low jitter
3. AC excitation source effectively reduces polarization
4. Gravity connector and BNC connector, plug and play, no welding
5. Software library supports two-point calibration and automatically identifies standard buffer solution, integrates temperature compensation algorithm
6. Uniform size and connector, convenient for the design of mechanical structures

Package Includes:

1 x DFRobot Gravity Lab Grade Analog Electrical Conductivity Sensor

This is a sensor that detects chlorine concentration and supports three output modes: analog, I2C, and UART. The probe has been calibrated at the factory, which can quickly and accurately measure the concentration of chlorine in the environment. Can be widely used in the detection of chlorine in the chemical, pharmaceutical production, and environmental protection fields.

The probe adopts the electrochemical principle, has the characteristics of strong anti-interference ability, high stability, high sensitivity, etc., and the service life is as long as two years. The sensor has 32 modifiable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function, It has good compatibility with mainstream main control devices such as Arduino, esp32, and raspberry pi. The easy-to-use Gravity interface, coupled with our sample code, can quickly build a chlorine concentration detector.

Applications:

Features:

1. Strong anti-interference ability
2. High stability
3. High sensitivity
4. Light weight
5. Easy to use
6. plug & play

Package Includes:

This is a non-contact liquid level sensor with status indicator and adjustable sensitivity. It can be used in liquid detection of non-metallic container or pipe(outer diameter>11mm), suitable for all types of detection of curved or flat surfaces, arcs, cylindrical containers or piping fluids. The status feedback of the sensor can be given in real-time. Besides that, the sensor comes with a 4pin sensor adaptor that can directly collect digital signal, convenient for connecting with Arduino or other main-controllers. This liquid level sensor can be widely used in liquid detection of a tank, water dispenser, etc.

Features:

1. High stability and sensitivity
2. Adjustable sensitivity
3. With status indicator
4. Can be used in liquid detection of non-metallic container or pipe(outer diameter>11MM), non-contact detection, and will not be affected by corrosive liquids like strong acid and alkali, or other impurities
5. Accurate detection can detect the liquid level of boiling water
6. Pure electronic circuit structure, non-mechanical structure, stable performance, and long working life
7. High sensitivity and strong anti-interference ability, not affected by external electromagnetic interference, special treatment for power frequency interference, and common mode interference.
8. Strong compatibility, penetrate all kinds of non-metallic container pipes, such as plastic, glass, ceramic, and other containers. The thickness of pipe the sensor can detect reaches up to 20mm;
9. Suitable for all types of detection of curved or flat surfaces, arcs, cylindrical containers or piping fluids
10. 5~12V wide voltage range, suitable for various circuits or applications.

Specification;

1. Power Supply: 5~12V
2. Output: switch quantity
3. Response Time: 500ms
4. Operating Temperature: -5~105°C
5. Suitable Container Outer Diameter: ≥11mm
6. Liquid Level Error: ±1.5mm
7. Material: ABS
8. Waterproof Performance: IP65

Packages Includes

1 x DFRobot Non-contact Capacitive Liquid Level Sensor for Container ODgreater than 11mm

You can stop worrying when you use automatic ST-70AB liquid level control switch ST-70AB control water pump switch power than normal
control switch. Is safe and free short-circuits or burn – out problems.

ST70AB is use for control water inflow or outflow, this switch is suitable for both household and industrial  use, easy to install, low electricity consumption. safe and reasonably priced.

Features:

1. Double circuits: Such a switch has two circuits of A.B. The A terminal is used for water supply and the B terminal is used for pumping water.
2. High accurate: Solid float ball is immersed in water, the center of gravity is stable, which does not float on the water surface, and it has high accuracy.
3. Easy installations: Base is equipped with 3/4 inch and 1inch two-section screw-toothed conduits directly, with L-type bracket for flat mounting.
4. CONVENIENT TO USE: Meanwhile, the double float ball water level switch has excellent performance and is easy to use.
5. Durable: The switch is sealed by the housing, completely moisture-proof, and it maintains precise performance and extends switch life.
6. Voltage: 220V
7. Material: Plastic
8. Model no: ST-70AB
9. Cable: 1.2M

Packages Includes:

1 x 70AB Float Switch Water Level Controller

The FS1012 MEMS mass flow sensor module measures the flow rate using the thermo–transfer (calorimetric) principle. The FS1012 is capable of measuring a gas or liquid medium. The FS1012 offers key advantages over resistor–based flow solutions. The sensor utilizes thermopile sensing, which provides an excellent signal–to–noise ratio. The sensor comprises a “solid” thermal isolation technology and silicon–carbide coating to protect
it from abrasive wear and provides robustness and long–term reliability. In comparison, other sensors typically contain a fragile membrane above an etched cavity for the thermal isolation base. The FS1012 features the sensor fully assembled and wire–bonded out to a 6–pin header. Wetted materials consist of a glass fiber reinforced PA66 resin, epoxy, and silicon carbide.

Applications:

1. Process controls and monitoring
2. Oil and gas leak detection
3. HVAC and air control systems
4. CPAP and respiratory devices
5. Liquid dispensing system

Features:

1. Gas or liquid mediums
2. Robust “solid” isolation technology
3. Resistant to surface contamination
4. No cavity to cause clogging
5. Resistant to vibration and pressure shock
6. Low power application
7. Sensitive at low flow rates and differential pressure levels

Specifications:

1. Fast response: <5ms
2. Millivolt output
3. Supply voltage: 3V to 5V
4. Module operating temperature range: 0°C to +85°C

For more info refer datasheet

Packages Includes:

1 x RENESAS Flow Sensor, FS1012 Series, Gas, MEMS, 10000 SCCM, 3 V to 5 V, mV Output