Wireless Differential Pressure Sensor Redy

Quick Answer: The Redy wireless differential pressure sensor measures the difference in pressure between its two ports and logs it wirelessly. A wireless differential pressure sensor is used where a small pressure difference matters more than the absolute value, as in Venturi tubes, Pitot tubes and airflow studies.

Two Ports, One Difference

A single-port gas pressure sensor reads the whole pressure, around a hundred kilopascals at sea level, so a change of a few pascals barely registers. A differential sensor compares two ports directly and can therefore resolve small differences, such as those along a Venturi tube or between the two openings of a Pitot tube. It does the job of a U-tube manometer while producing a logged, numerical trace.

In a Venturi tube, air or water speeds up through the narrow throat and its pressure falls, which is Bernoulli’s principle; connecting the ports to the wide section and to the throat shows that drop directly. A Pitot tube facing into an airstream gives a pressure difference linked to air speed, so students can measure the speed of air from a fan or in a simple wind tunnel.

Which port reads positive, the range and the fitting size are not given in the title. For gas-law work in one sealed volume, the wireless pressure sensor is the matching choice.

Specifications

Applications

• Demonstrating Bernoulli’s principle with a Venturi tube
• Measuring air speed with a Pitot tube in front of a fan or in a wind tunnel
• Comparing the pressure drop across clean and clogged filters
• Measuring small pressure differences in place of a water manometer

Care & Handling

• Keep liquids out of both ports; use traps or air-filled lines in water-flow experiments.
• Label the tube to each port so the sign of the reading is not reversed by mistake.
• Do not blow directly into a port unless the range allows it; small-range sensors are easily overloaded.
• Zero the sensor with both ports open to the same air before each run.

Why Choose LabEquip

Engineering and physics departments teaching fluid flow, and schools building simple wind tunnels, are the usual buyers. LabEquip offers it alongside its other chemistry lab equipment; describe the set-up you have in mind via the contact page.

Frequently Asked Questions

How is a differential pressure sensor different from a gas pressure sensor?

A gas pressure sensor reads the pressure in one system, usually relative to vacuum. A differential sensor compares two ports and reports only the difference, which lets it detect much smaller changes.

How does a Venturi tube show Bernoulli’s principle?

Fluid speeds up where the tube narrows, and faster flow goes with lower pressure. With the sensor connected to the wide section and the throat, the throat reads lower.

How do I measure air speed with a Pitot tube?

Point the Pitot tube into the airstream and connect its two outlets to the sensor. The pressure difference is related to air speed by a standard equation that uses air density and the measured difference.

What does a negative reading mean?

The ports are connected the other way round from the software’s convention, or the flow is reversed. Swap the tubes or note the sign; the size of the difference is unchanged.

Can the sensor be used with water?

Liquid should not enter the ports of most such sensors. In water-flow experiments, connect through air-filled tubes or traps so only air touches the sensor.

Why zero the sensor before each run?

Small offsets drift with temperature and handling. Zeroing with both ports exposed to the same air sets the starting difference to zero, so only the effect you are studying is recorded.

Last Updated: September 2026