Pressure and Steaming

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

Pressure and Steaming

A steamer is used to simplify the removal of window tint from a vehicle’s windows or to facilitate the removal of wallpaper or to quickly and easily remove wrinkles from clothing. In any case, the process is rather straightforward. Water heated in the steamer produces steam. Using the pressure that builds up during heating, the steam is then emitted from the steam head toward the target area.

Similar to any sealed unit that heats water, also known as a boiler, the amount of pressure that builds up must be controlled for safe operation of the steamer. For example, in a Jiffy Clothing Steamer, there is a 304 stainless steel ball inside the pressure cap on the water tank. When the back pressure builds up to a point greater than the design pressure in the cap, the ball will be moved off the pressure relief hole and vent the boiler tank.

Jiffy Clothing Steamer

 

The combined gas law allows the calculation of the amount of pressure.

𝑷𝟏*𝑽𝟏/𝑻𝟏=𝑷𝟐*𝑽𝟐/𝑻𝟐

Where:

P – Pressure with units in pascals,

V – Volume with units in cubic meters (m3)

T – Temperature measured in Kelvin

If the volume does not change during the boiling process, the ambient pressure (101.3 kPa) will increase to 129 kPa when room temperature water is heated until it boils. The 28 kPa rise in pressure is 4 psi.

While the only variable that the user can control is the amount of heat applied to the water, with a MEMS pressure sensor, the safe design value can be verified and tested for manufacturing consistency in production.

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Pressure for a Safe Installation

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

Pressure for a Safe Installation

When an old heating, ventilation and air conditioning (HVAC) unit is past its prime, it’s time to bring in the experts.  Before the HVAC experts can apply their skills, the unit must be safely moved from the truck that brought it to its ultimate mounting location. This involves several safety protocols including solidly anchoring the truck and its crane, carefully attaching the cable to lift and move the unit, monitoring both the angle of the arm and amount of weight being lifted and, finally, avoiding sway. While several of these aspects, especially the last one, are ensured by the expertise of the operator, a pressure measurement from a load meter tells the operator that the load is withing the safe lifting capabilities of the crane including its hydraulics.

HVAC Unit Replacement Process

Safely lifting and moving the HVAC unit includes monitoring the weight of the load through a pressure measurement. In this case, the UNIC gauge provides the weight in 1000# and hydraulic pressure in psi with a red line at 3,000 psi.

Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
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Pressure in Airflow for Cooling

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

Pressure in Airflow for Cooling

Some medical procedures involve cooling and pressure to safely implement them. For example, the Cryo 6 therapy system delivers air at temperatures down to -30°C air for efficient pain treatment, swelling reduction and muscle relaxation. The system enables cryotherapy with precise placement and at a constant dosage. Other cooling methods, such as contact cooling, cryogen spray or ice packs pose the risk of skin burns. In contrast, the Cryo 6 system decreases the skin temperature quicker and keeps a constant dosage throughout the entire treatment time.

In dermatology procedures, such as a blue or red LED light therapy that involve exposing the skin to infrared light after a chemical has been applied to improve the efficacy of the treatment, the cooling unit makes the 20-minute procedure tolerable by providing cooling air.

Cryo 6 therapy system

Single-touch buttons on the Zimmer Cryo 6 control panel allow easy adjustment of the therapy fan speed and treatment time. Simply tapping the up or down buttons adjusts either setting. In this case, the level 5 setting indicates a relative measurement made by a pressure sensor.

Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
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Using Pressure to Find Undersea Treasures

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

Using Pressure to Find Undersea Treasures

For treasure hunters and salvagers trying to find historical and valuable items from ships that sank centuries ago, there are two options: sucking up or blowing away the sand — both involve pressure. Vacuuming sand from the bottom of port channels is common for dredging operations that relocate the sand to provide accessibility to ships. One recent project used a vacuum (negative pressure) approach with a two-mile-long, 30-inch-wide pipeline to transport the sand.

In contrast, treasure hunters just need to move the sand out of the way so they can see objects that have settled below layers of silt. They are not concerned with where the sand goes, so positive pressure has proven to be the technique of choice. Using a method invented in the 1960s by legendary salvager Mel Fisher, steel tubes called mailbox blowers, redirect engine wash from a boat’s propellors downward to clear the ocean bottom some 30 feet underwater. For a given size opening, the size of the props and their speed determine the depth and intensity of the jet from the prop wash.

Two 33-inch diameter mailbox blowers clear away sand 30 feet underwater. Source: History Channel.Two 33-inch diameter mailbox blowers clear away sand 30 feet underwater. Source: History Channel.

The amount of pressure developed is not measured, but it must be sufficient to reveal the desired objects.

Salvaged Spanish gold coin from the wreck of the 1715 Treasure Fleet was located by pressure. Source: History Channel Beyond Oak Island.Salvaged Spanish gold coin from the wreck of the 1715 Treasure Fleet was located by pressure.
Source: History Channel Beyond Oak Island.

Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
Email us at [email protected]