While we have long pointed
to the U.S. Navy bench tests as the
best information about regulator
quality, these days the Navy
seldom tests new regulators.
However, Rodale’s Scuba Diving and
the British magazine, Diver, have
recently published their tests and
opinions, and a review of these
offers some useful insights.
Since Rodale didn’t publish
its test procedures, the only real
indicator of regulator quality is
the assertion that each regulator
has passed their standards for
high performance. Each is a
“tester’s choice,” and many are
labeled “best buys.”
Diver, however, clearly explained
its testing procedures,
and the results were simply stated.
Diver asked manufacturers to
submit their top-performing
regulator and one other for use in
the water and bench testing on an
ANSTI breathing machine calibrated
to measure several variables,
including work of breathing.
Four divers compared the
twenty-one regulators at a depth
of 130 feet. To simulate a worstcase
scenario of a partner out of
air, two divers tested a single first
stage with two identical second
stages. Partners would synchronize
breathing to put maximum
load on the system. Regulators
were breathed wrong-way-up to
test for water and also used facing
into a current to check free flow.
After the at-depth, in-water tests,
the regulators were bench-tested
on an ANSTI machine. No
checkout or servicing of the
regulators occurred after the
intense week of test diving and
before the bench tests.
The machine used a simulated
depth of 160 feet at a
temperature of 63 degrees F. with
tank pressure at 750 psi. It
breathed the regulators at 25
breaths per minute with a ventilation
rate of 2.25 cubic feet of air
per minute, a tough specification
unlikely to be found in real life.
Work of breathing was calculated.
The bench test did send up some
caution flags concerning a couple
of regulators in extreme conditions.
For example, both Beuchat
regulators sucked in a lot of water
at extreme conditions, and five of
the regulators could not deliver the specified 63 liters of air per
minute past the 150 foot depth.
The bench test did send
up some caution flags
concerning a couple of
regulators in extreme
conditions. |
Publications like to rely on
the impressions of individual
testers, but when it comes to
regulators, these are highly
subjective measures of personal
preference only. Take, for example,
some excerpts for the
Aqualung Micra Adj. from three
different testers: 1) “man, it’s
brilliant”; 2) “I needed to make a
real effort to inhale”; and 3)
“switching to it was like slipping
into overdrive.” Such comments
show why we like to rely on bench testing rather than individual
testers to evaluate a regulator’s
performance.
From Diver’s analysis, we think
four regulators deserve mention:
Apeks TX40 (sold in the U.S.
by Zeagle). This is probably the
best regulator tested by Diver,
based both on machine tests and
testers unanimously labeling it as
“exceptional.” At $350, the Apeks
TX40 is the best of the best buys.
Zeagle also buys regulator parts
from Apeks and makes its own
version of the Apeks TX40, which
it labels the Tech 50D. The Tech
50D has the same components
and performance standards as the
Apeks TX40, except that it has an
external adjustment knob and a
higher price tag: $483 for the U.S.
version.
Mares MR22 Ruby. The MR22
Ruby delivered a very smooth
performance and excellent
machine-test results (only two
regulators had better scores).
However, at a list price of $799,
it’s not a good value. Rodale’s lists
it as a “tester’s choice” but does
not give it a high-performance
machine-test result. The companion
Mares MR12 Voltrex has good
tester comments, good machinetest
results, and a much lower
price of $481. Rodale’s lists the
MR12 as one of its top eleven
machine-test performers.
Scubapro Mk20/G250. This
unit had one of the better machine-
test performances. Testers
found it outstanding (although a
step down from the top), but, at
$540, it’s hardly a best buy. Both
Rodale’s and Diver agree that the
Mk20/G250 had good machinetest
performance.
Spiro Supra D XR2 Cryo -
The D XR2 Cryo was very wellliked
by all testers and is now
available as the Cousteau D Cryo.
At $480, it certainly seems like a
good buy, but for some reason it’s not included in Rodale’s “best
buy” list.
I have confidence in the
presentation by Diver for several
reasons: 1) the primary regulator
tested for each manufacturer was
that manufacturer’s own choice of
its current best performer in
tough conditions; 2) all their
tested regulators meet the EN250
European standard; and 3) testers
for Diver pushed the performance
of the regulators to compare inwater
performance at depth, and
Diver then shared its tester’s
comments.
My experience adds two
factors: 1) how much maintenance
the regulator needs; and 2)
whether parts are available
worldwide. From a maintenance
standpoint, I greatly prefer the
diaphragm design (especially with
an environmental seal for use in
cold or dirty water). I also prefer
conventional design features so I
can get the regulator repaired in
some distant location if I need to.
Aqualung/U.S. Divers, Beuchat,
Mares, Oceanic, Poseidon,
Scubapro, and Sherwood all seem
to be widely distributed in the
Caribbean, but the ease of getting
offshore maintenance and parts
varies widely, with Oceanic,
Poseidon, and Beuchat having
presented problems for me in this
regard. On the other hand,
problems with offshore maintenance
and parts availability have
been minimal with Aqualung/
U.S. Divers and Sherwood
equipment.
— T. J.
Next issue: a look at the benchtest
results.