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With continuous flow units, oxygen delivery is measured in LPM (liters per minute). Providing continuous flow requires a larger molecular sieve and pump/motor assembly, and additional electronics. This increases the device’s size and weight (approximately 18–20 lbs). [13]
Typically, these devices produce the equivalent of one to five liters per minute of continuous oxygen flow and they use some version of pulse flow or "demand flow" to deliver oxygen only when the patient is inhaling. [14] They can also provide pulses of oxygen either to provide higher intermittent flows or to reduce power consumption.
References will be made to "actual" flow rate through a meter and "standard" or "base" flow rate through a meter with units such as acm/h (actual cubic meters per hour), sm 3 /sec (standard cubic meters per second), kscm/h (thousand standard cubic meters per hour), LFM (linear feet per minute), or MMSCFD (million standard cubic feet per day ...
The standard liter per minute (SLM or SLPM) is a unit of (molar or) mass flow rate of a gas at standard conditions for temperature and pressure (STP), which is most commonly practiced in the United States, whereas European practice revolves around the normal litre per minute (NLPM). [1]
An air flow meter is a device similar to an anemometer that measures air flow, i.e. how much air is flowing through a tube. It does not measure the volume of the air passing through the tube, it measures the mass of air flowing through the device per unit time, though Thus air flow meters are simply an application of mass flow meters for the ...
The Summit Oxygen system marketed in 2023 uses a constant flow regulator with steps of 0.5 litres per minute up to a maximum of 4 litres per minute. An innovation is that the flow rate selector is on the supply hose where it can be reached easily and therefor is likely to be adjusted more frequently to suit current exertion, thereby making more ...