mares xr 28 HR no online pressence

[rsingler]

Not a problem. Since a diaphragm mechanism is dry, any ice formation will be on the outside of the reg. The spring end that is nominally exposed to water is at the opposite end of the regulator from the valve, where all the adiabatic cooling occurs.
And unlike virtually all other second stage designs, the Mares design uses a bypass tube to take gas from the valve to the mouthpiece, while the lever mechanism does not have gas flowing through it. All the adiabatic cooling occurs at the valve, with the cold carried down stream.
Here's an old NEDU -1°C picture that shows the hose connection and bypass tube completely covered in ice, while the body of the regulator was clear. That means the lever mechanism won't freeze up. All other brands carry the cold gas downstream from the valve right through the lever mechanism. Mares is unique.

versus

 

[Mobulai]

Not a problem. Since a diaphragm mechanism is dry, any ice formation will be on the outside of the reg. The spring end that is nominally exposed to water is at the opposite end of the regulator from the valve, where all the adiabatic cooling occurs.
And unlike virtually all other second stage designs, the Mares design users a bypass tube to take had from the valve to the mouthpiece, while the lever mechanism does not have gas flowing through it. All the adiabatic cooling occurs at the valve, with the cold carried down stream.
Here's an old NEDU -1°C picture that shows the hose connection and bypass tube completely covered in ice, while the body of the regulator was clear. That means the lever mechanism won't freeze up. All other brands carry the cold gas downstream of the valve right through the lever mechanism. Mares is unique.
View attachment 891114
versus
View attachment 891115

Only now I finally actually understand how the VAD tube works, by merit of this explanation (and pics)
The cad render video never came close

 

[rsingler]

All the above notwithstanding, the 28XR comes with the TBP sealed cap standard. It's an added extra for the 62x. Either way, TBP is worth considering if you're diving 5°C frequently.

 

[lowwall]

That means the lever mechanism won't freeze up. All other brands carry the cold gas downstream of the valve right through the lever mechanism. Mares is unique.
View attachment 891114
versus
View attachment 891115

Just in case you missed the "versus" sandwiched between the two pics, that second reg is not a Mares. It's a conventional second stage where the breathing air runs through the mechanism.

 

[Tanks A Lot]

[...]It's a conventional second stage where the breathing air runs through the mechanism.

How dare you call an Apeks a conventional second stage? Everyone knows Apeks represents the "Apex" of SCUBA regulators, as the pictures clearly demonstrate!

It baffles me to this day how they managed to market themselves so successfully to technical divers...