SPG: Submersible Pressure Gauges & Computers

A SPG - Submersible Pressure Gauges & Computers is a scuba diving instrument that shows, in either mechanical or digital form, the remaining air volumes left in a scuba air tank.

Current design models of instrument are connected to a high pressure outlet on the first stage part of a regulator via a hose.

Although the latest scuba diving regulators do not include hoses, a wireless pressure gauge transmitter is usually integrated into the first stage part of a diving regulator.

Mechanical SPG, also known as Bourdon tubes, are spiral or circular oil-filled tubes that have diaphragms on one end and closed ones on the other. Generally, this mechanical gauges works by pushing air against the diaphragm, thus further straightening the tube.

Digital SPG, meanwhile, make use of transducers that efficiently convert pressure into voltage. Once the voltage is converted, it is then turned into a digital signal that signifies a digital readout.

Moreover, there are several widely accepted types of Submersible Pressure Gauges & Computers. One of these is the Standard type, which is basically an analogue gauge that can be held by hand. Usually connected to the first stage part of a diving regulator, the standard type displays pressure range with a pointer moving over a dial that are fixed with a rubber or plastic consoles, including a compass, a dive computer, and depth gauge.

The button gauge is another accepted type of submersible gauges that is directly connected to the first stage part of a regulator. This is often utilized on the decompression cylinder. Based on its name, the Button gauge is small in size, thus making it difficult to read gauge resolution of less than 300 psi.

Another essential type of submersible pressure gauges & computers, the air integrated computers is a widely known type of submersible pressure gauges & computers among professional divers. This computer-based type is generally designed to display, monitor, and measure pressure rate in a diver's scuba tank. Although dive pressure gauge computer can be a very useful tool for pro and recreational divers, it cannot monitor a diver's gas supply once the computer fails.

Today, modern versions of the decompression metre, now known as the dive computer, have LCDs that provide vital details on depth, maximum depth, remaining time until decompression stops, and total dive time.

More advanced dive computers can even tell the diver, through the LCD or buzzers, of other dive-related information, such as ascent rate, water temperature, and dive profile, and expedition details including dive logs, maximum periods for subsequent dives, and time for plane boarding.

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