DGX Gears Deluxe Gas Blending and Transfill Kit with Digital Gauge
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A digital pressure gauge is a must for accurate, repeatable and reliable gas blending applications. The accuracy and precision of the digital gauge included with our premium quality transfill hose makes this system suitable for gas blending of Nitrox, Heliox and Trimix diving gases as well as transfilling. It includes a quick connect system that makes it easy to reconfigure, providing the ability to blend or transfill from a variety of sources. The high pressure { 96 in | 2.4 m } Swagelok® breathing gas hose is long enough to reach even the tallest supply cylinders and has a check valve to prevent back flow.
The inlet end of the hose quick connects to any of the three common adapters included in the package: a CGA-580 helium/argon and a CGA-540 oxygen for bulk storage cylinders in the US plus a DIN 477 (aka G 5/8" BSP) thread form connector suitable for use with 200 Bar and 300 Bar DIN SCUBA fittings. Add an optional BS341-3 oxygen/helium international adapter (aka 'Bullnose #3') for connection to bulk storage cylinders outside the US. The outlet end of the hose includes a line valve, a digital electronic pressure gauge and a DIN scuba fitting with bleed valve standard DIN fittings that connect to both 200 Bar and 300 Bar standard scuba cylinder valves. Nice feature of the Dive Gear Express version is the bidirectional pressure bleed is a rotating collar on the stem, so there is no bleed screw to lose. Add one or two optional DIN-to-Yoke adapters to transfill recreational sport scuba cylinders with yoke A-clamp valves (aka 'K-valves', formally described by the GGA-850 standard).
The very accurate digital gauge provides readings in imperial (psi) and metric (bar) units of measurement. Corrosion resistant compatibility with all gases commonly seen in the SCUBA industry: Air, Nitrox, Oxygen, Trimix, and Helium. The wetted surfaces are stainless steel and brass and Nitrox Ready.
Digital Gauge Key Features:
- Easy-to-read 4-digit LCD display w/backlight - Push-button controls
- User selectable units of measure: PSI, BAR, or MPA (kg/cm2)
- Range 5 to 5000 PSI with accuracy: ±1% full scale (±3 @ 300 psi, ±30 at 3000 psi)
- Auto zero and maximum peak pressure memory recall and reset
- 2.5" Thermoplastic housing with rubber boot, NEMA 4X weatherproof
- Battery saver automatically shuts off the display after 3 minutes
- Requires one standard 9V alkaline battery
The maximum service pressure of the entire kit is limited to service pressure of the brass quick-connect couplings, which is {4000 PSIG @ 70 °F | 275 BAR @ 21 °C}. The industrial housing of the gauge is rated NEMA 4x weatherproof and resists corrosion but is NOT rated as IP68 waterproof. Do NOT submerge and avoid storage open to marine or high moisture environments. Remove the 9V alkaline battery for long term storage.
If in the future you decide to purchase one of our boosters, then this kit can easily be reconfigured to support the booster with the UPGRADE for Booster kit.
Some customer reviews confuse the issue of a needle valve vs the line valve actually included in the product. The DGX Deluxe Gas Blending and Transfill Kit with Digital Gauge was designed by Mark at Dive Gear Express and all the components were carefully selected by him; Mark is IANTD certified Gas Blending Instructor Trainer. He says that the valve included is a high quality line valve perfectly matched to this application for accurate blending.
| Brand | DGX Gears |
|---|---|
| SKU | DX-BKIT-DPG5000 |
| Weight | 8.000000 |
Customer Reviews
WARNING
Oxygen-related fires and explosions can result in serious injury or death. According to our suppliers, these products are compatible with oxygen and factory cleaned for use with oxygen. Nonetheless, the 'clean state' of this equipment applies only prior to initial use. Thereafter, periodic inspection and cleaning are a necessity.
Never breathe unblended pure inert gases such as helium or argon that do not contain oxygen, as even a few breaths can cause sudden loss of consciousness without warning. Pure inert gases are sold in compressed gas storage cylinders with a special CGA-580 valve designated for use ONLY with inert gases; never use ordinary diving cylinders with SCUBA valves to store unblended pure inert gas.
You must meticulously follow the recommendations of the US Department of Transportation (DOT), Compressed Gas Association (CGA), and other federal/state/local agencies, plus your training agency for equipment maintenance, handling, storage, labeling, filling, transport and use of compressed gases. Ultimately, you must make the final decision to assume all risks associated with the use of any compressed gases.
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How do the grades of compressed oxygen differ?
Nearly all compressed oxygen gas produced in the US is what is known as USP quality, meeting or exceeding United States Pharmacopeia quality standards for human consumption. The gas itself is normally manufactured using cryogenic separation of air, resulting in a gas that is very close to pure oxygen: > 99.5% with the balance being inert gases, mostly argon. There are three grades of compressed oxygen gas widely sold in returnable supply cylinders with the CGA-540 dedicated oxygen connector on the valve: Aviation (aka ABO), Medical, and Industrial (aka Welding). As a practical matter, the differences in the three grades as sold today are not quality of the oxygen being put in the cylinder but rather the procedure used to fill the cylinder and, in the case of Medical grade, licensing or documentation requirements.
Industrial grade oxygen cylinders can be just topped up when refilling and, although unlikely, could be contaminated with other unknown gases that might have back-flowed into the cylinder during use or filling. Aviation and Medical grades must have the cylinder completely evacuated before every fill with each documented and traceable lot being tested for purity. Medical grade oxygen is legally regulated in the US by the Food and Drug Administration and filling a cylinder for medical use incurs some FDA licensing requirements for the cylinder fill station operator.
Medical oxygen is considered a drug, and thus requires a doctors prescription for the FDA licensed fill station operator to fill the cylinder. The FDA has granted an exception to the prescription requirement for medical cylinders marked as emergency use only, but they still should only be filled with USP quality oxygen and following FDA guidelines. To blend breathing gas mixtures for Nitrox and technical diving, most blenders use Aviation grade oxygen to avoid the FDA licensing requirements yet still use an oxygen grade suitable for human consumption.
Among divers, perhaps the most often debated topic about oxygen grades is should industrial grade oxygen be used for SCUBA applications. That's because welding oxygen is relatively cheap and brand name compressed gas suppliers usually fill oxygen cylinders from the same high quality source while following best practices regardless of grade. However, small welding supply operations are more likely to just top up their industrial grade oxygen cylinders from a local bulk supply and may not follow best practices. Unless the entire supply chain for each and every cylinder of oxygen can be trusted with absolute certainty, in our opinion using industrial grade oxygen for diving applications is a needless risk.
See also Helium Grades for Breathing Gases in Diving
For much more detail about types of oxygen, especially recommendations regarding applications found in diving and diving emergencies, read Oxygen: Concentrations, Grades, and Labels by Larry "Harris" Taylor, Ph.D.
