Pressure in HVAC Systems

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 HVAC Systems

While addressing COVID-19 health issues and getting back to normal, one of the major concerns, especially for education, is acceptable ventilation.

Unfortunately, due to COVID-19, one of the leading conferences in this area, the Michigan Industrial Ventilation Conference, will not be held this year. In its place, a series of webinars facilitated by conference instructors will cover the fundamentals of industrial ventilation.

As noted in the seminar description for the first of the these webinars that will start March 3, pressure, as  well as temperature, elevation, and moisture content impacts an airstream’s density and density factor.

Another webinar will specifically address difficult testing situations and detail selection methods for providing the most accurate representation of pressure and airflow possible. Yet another will cover techniques and equipment for monitoring industrial ventilation systems to ensure that the system operates properly.

Those interested in more information on alternatives being offered to the 2021 conference should click here.

All Sensors Corporation MAMP Series P1NS Package

Those who are interested in accurate pressure sensors in the low-pressure range to detect clogged filters and airflow in HVAC systems should consider All Sensors MAMP Series of calibrated amplified output that can address 5 to 120 cmH2O measurements.

Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
Email us at info@allsensors.com

Communicating Using Nasal Pressure

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.

Communicating Using Nasal Pressure

Blink once for yes, twice for no. This technique is frequently used in movies, TV and real life to communicate with a person who is severely injured. It is also used to communicate with “spirits” and even as a secret code for perfectly healthy individuals. In either case, the communications are always limited to yes or no. With the help of pressure sensors, the ability to communicate and even control objects could improve dramatically.

In the report, “Sniffing enables communication and environmental control for the severely disabled,” researchers investigated and confirmed a premise that in addition to eye control, sniffing may remain unimpaired following a severe injury. This is of interest especially for quadriplegic and “locked-in syndrome” patients. Locked-in syndrome patients have intact cognition but are completely paralyzed, so communicating using eye blinks is a harsh reality.

For their analysis, researchers needed to measure nasal pressure and convert it into electrical signals; they needed a pressure sensor that could provide very accurate, high resolution linear measurements of low pressure signals. For their sniff controller, the researchers used All Sensors’ 1-INCH D1-4V-MINI  Miniature Amplified Output pressure sensor. With this sensor, common mode errors and output offset errors due to change in temperature, stability to warm-up, stability to long time period, and position sensitivity are significantly reduced.

To confirm their theory and the possible capabilities of nasal pressure variations, measurements on healthy subjects were made using a mouse, joystick and the sniff controller. Figure 1 shows the approach, data and sensor used for the measurements. With the theory confirmed on healthy individuals, the next step was testing on the target test group.

54A

 

(A)54B

(B)

 

Figure 1. Data from sniff controller measurements (a) using the 1-INCH D1-4V-MINI low pressure sensor (b) show excellent results compared to well-established mouse and joystick control techniques.

Using precise nasal pressure measurements, the researchers’ test results show that sniffing allowed completely paralyzed locked-in participants to write text and quadriplegic participants to write text and even maneuver an electric wheelchair. They also determined that the sniff controller can be used independently of respiration, so even artificially-respirated individuals can benefit from its implementation in end products.

In addition to its use in those end products, the 1-INCH D1-4V-MINI can provide the required accuracy for many other respiratory measurements and other low pressure measurements in medical and other applications.

Comments/Questions?
Do you have a pressure sensing question? Let us know and we’ll address it in an upcoming blog.
Email us at info@allsensors.com