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Nine balanced first stages across four model lines: Mercurio ICE, Giove ICE, Plutone (standard and ICE), and Minerva. All are DIN configuration and available in chrome satin or Duratek black finishes. ICE-rated variants add sealed cold-water chambers for diving below 10°C. The Minerva adds piston-balanced geometry to the range as a distinct internal architecture.
The Balanced First Stage Range
A balanced first stage delivers constant intermediate pressure regardless of cylinder fill level. As a cylinder empties from 200 bar down to a 50 bar reserve, a balanced mechanism compensates automatically, maintaining the IP within the design specification. This means breathing effort at the second stage does not increase as the dive progresses — a critical characteristic for technical diving where cylinders may be run well below half fill during staged decompression or extended penetrations.
Sopras Tek balanced first stages fall into two groups: ICE-rated cold water models (Mercurio ICE, Giove ICE, Plutone ICE) and standard balanced models (Plutone, Minerva) for temperate and warm water.
Model Overview
The Mercurio ICE series (SKU 605232–605235) is available in DIN satin chrome and DIN Duratek black, with both INT and DIN versions for each finish. It is a sealed-chamber ICE design with cold-water rating. The Giove ICE series (SKU 605236–605239) follows the same dual-finish, ICE-rated architecture. The Plutone series is the broadest in the balanced range, covering four variants: standard bright chrome, standard Duratek black, Plutone ICE bright chrome, and Plutone ICE Duratek black — nine SKUs in total across 1st stage configurations. The Minerva Satin Ch. pist.bal. (SKU 605202/3) is a piston-balanced design in chrome satin, the single piston-mechanism option in the balanced range.
Cold Water Ratings and Finishes
Duratek BK (Duratek black) refers to the Duranodic hard anodising process applied to aluminium alloy bodies. It is harder than standard anodising, more resistant to abrasion from rock faces, harness webbing, and cylinder contact, and provides a matte black finish preferred in technical diving contexts. Satin chrome (Satin Ch.) refers to a chrome-plated brass body with a satin rather than polished surface, providing corrosion resistance with a lower-glare finish. Both are appropriate for saltwater diving; Duratek is generally considered more durable in high-contact environments.
What to Look For
- ICE vs. standard: If you dive in water below 10°C with regularity, choose an ICE-rated model. The sealed chamber prevents water from contacting the internal mechanism and freezing. In warmer water, standard Plutone or Minerva is sufficient and slightly simpler to service.
- Piston vs. diaphragm mechanism: The Minerva is piston-balanced; Mercurio, Giove, and Plutone are diaphragm-balanced. Diaphragm designs isolate internal components from the water environment entirely, which is the reason they carry cold-water ratings. Piston designs are simpler to service in the field.
- DIN inlet rating: Verify whether your cylinders use DIN 200 or DIN 300 valves. Technical cylinders frequently run 300 bar DIN. All models accept standard DIN connection; confirm valve compatibility before ordering.
- LP port count for multi-hose setups: Technical configurations using a second stage, octopus, BCD/wing inflator, drysuit, and stage regulator require 4–5 LP ports. Confirm port layout for the specific model.
- Finish matching with system: If you’re building a matched system, both Duratek black and satin chrome finishes are available across Mercurio ICE, Giove ICE, and Plutone to match second stages and hardware aesthetically.
Maintenance and Care
Rinse balanced first stages in fresh water after every dive with the DIN inlet cap installed. For ICE-rated models, the environmental chamber seal should be inspected at each service and replaced if any deformation or cracking is visible — a compromised chamber seal defeats the cold-water protection. Annual service with model-specific kits (available in Replacement Parts) replaces HP seat, IP seat, o-rings, and diaphragm as specified. Verify intermediate pressure with a calibrated IP gauge after service. Use oxygen-compatible Christo Lube MCG 111 for any regulator intended for nitrox or oxygen service.
FAQ
What does “ICE” mean on Sopras Tek first stages?
ICE denotes a cold-water certification for use below 10°C. ICE-rated first stages have a sealed environmental chamber that isolates the internal mechanism from the surrounding water. In cold water, moisture in the breathing gas can freeze when it contacts cold metal parts during the rapid expansion of high-pressure gas — ICE sealing prevents this by keeping water away from the demand valve mechanism entirely. Non-ICE models are suitable for water temperatures above 10°C.
Is the Plutone or Mercurio ICE better for technical diving?
Both are balanced and technically capable. The Mercurio ICE adds cold-water sealing, making it the preferred choice if your diving includes cold environments. For warm or temperate water technical diving, the Plutone — particularly the Plutone ICE variants — provides balanced performance at a slight cost advantage. The choice ultimately comes down to temperature range and finish preference; both carry the same basic technical capability of constant intermediate pressure delivery.
How many LP ports do these first stages have?
The specific port configuration varies by model. Technical-focused balanced first stages in this range typically offer 4 LP ports and 2 HP ports as a standard configuration, accommodating second stage, octopus or backup, BCD/wing inflator, drysuit hose, and SPG. Check the product detail page for the specific model you’re configuring to confirm port layout before building a hose set.
Can I convert between DIN and INT connection?
All models are supplied in DIN configuration. Some models support a conversion to INT (A-clamp/yoke) using an adapter. DIN is preferred for technical diving because it provides a more secure connection and supports higher cylinder pressures. If you dive internationally where INT valves are common, an adapter allows the same first stage to be used on both valve types without requiring a second regulator.
What service interval do balanced first stages require?
Annual service or every 100 dives, whichever comes first, is the standard for balanced technical first stages. Cold-water ICE-rated regulators should not exceed annual service intervals regardless of dive count. Model-specific service kits for Mercurio, Giove, Plutone, and Minerva are available in the Replacement Parts category. The Regulator Servicing category stocks adjustment tools, intermediate pressure gauges, and Christo Lube for completing a full overhaul.