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user manual: pSCR is not driven from back gas by default
Generalize the wording. pSCRs are typically configured with a swichblock, allowing insertion a any gas in the unit, equivalently with a gas change on open circuit. Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
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@ -1954,11 +1954,11 @@ image::images/sidemount1.jpg["FIGURE: Sidemount profile",align="center"]
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Passive semi-closed rebreathers (pSCR) are a technical advance in diving equipment that
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recirculates the breathing gas a diver uses, while removing carbon dioxide from
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the exhaled gas. While a small amount (typically a tenth) of the exhaled breathing gas is released into the water,
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a small amount of fresh gas is released from the back gas cylinder.
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a small amount of fresh gas is released from the driving gas cylinder.
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A diver using a single cylinder of breathing gas can therefore dive for much longer periods than
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using a recreational open-circuit configuration. With pSCR equipment, a very small amount of breathing
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gas is released every time the diver inhales. With active SCR (aSCR) equipment, in contrast, a small amount of
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breathing gas is released continuously from the back cylinder.
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breathing gas is released continuously from the driving cylinder.
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To log pSCR dives, no special procedures are required. Use the normal steps outlined above:
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@ -1970,7 +1970,7 @@ To log pSCR dives, no special procedures are required. Use the normal steps outl
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If a pSCR _Dive Mode_ has been selected, the dive ceiling for that is adjusted for the oxygen
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drop across the mouthpiece, which often requires longer decompression periods. Below is a dive profile
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of a pSCR dive using EAN36 on the back cylinder and oxygen for decompression. Note that this dive lasted
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of a pSCR dive using EAN36 as bottom gas and oxygen for decompression. Note that this dive lasted
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over two hours.
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image::images/pSCR_profile.jpg["FIGURE: pSCR profile",align="center"]
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