Oxygen regulators can have either a CGA 870 yoke style fitting ( for E or D size cylinders ) or a CGA 540 nut/nipple style fitting (for K, M, or H size cylinders) as inlets. They can be configured in a 50 PSI preset pressure mode, an adjustable pressure mode (most commonly 0-100 PSI) or in a custom configuration utilizing, adjustable pressure and flow rate options.
Most respiratory and anesthesia equipment is calibrated at 50 PSI pressure. Therefore, when supplying the gas necessary for powering these products, a 50 PSI preset regulator is a good option to use. The pressure is fixed; it cannot be adjusted (preventing incorrect operation of the device it is being used with) . The regulator can come with a standard gas specific DISS 1240 outlet, an adjustable Thorpe tube flowmeter, a medical quick connect coupler, or a combination of these options. Configuring the regulator would allow it to be used in a variety of applications.
In a lab or a biomed department, an adjustable PSI regulator is often the item of choice. Pressures other than the 50 PSI standard are used in testing equipment for proper functionality. Common configurations are 0-100 PSI and 0-30 PSI (for use with Pulmonary Function equipment).
On occasion, unusual situations calls for a configuration that is difficult to understand or find – thus the need for specialty oxygen regulators.