AirSep SeQual Workhorse Series, Instruction Manual

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14 Workhorse-8 Instruction Manual
AirSep Corporation
Generally, if the pressures are high and the concentration is low, the order of
checking is:
1. Is the motor on the ATF rotating?
2. Is the motor on the ATF rotating at the correct speed? By wiping off the
spindle and making a mark, the rotation can be observed. Typically, it
should be at 2-4 RPM, so it can be timed for 15 or 30 seconds, or a full
rotation can be timed. Compare to the time marking (in seconds) on
the side of the gear motor or contact AirSep for the correct RPM.
3. Is the ATF contaminated with water or oil (if an oil-lubricated
compressor is being used)?
If the pressure relief valve is audibly actuating, it is either a sign that the pressures
are high, or that the pressure relief valve has drifted from its preset point and
requires replacement.
If water contamination is suspected, the weight of the ATF can be compared with its
weight when it shipped.
Other symptoms:
If the pressures are fluctuating more than about 2 psig around the median, it could
indicate an internal rupture or a previous incidence of the motor not turning. If the
pressure fluctuates more than 3 psig on the air input, this might indicate that one or
more of the flow-controlling orifices inside is compromised. That would mean when
the cycle pressurizes these beds, the flow is higher than normal and the pressure
goes down.
Alternatively, if there was an electrical discontinuity or other valve stoppage for
a period of time while air was being introduced or a vacuum was drawn from the
product end (like from an injector), some of the beds may be contaminated. When
the cycle pressurizes these beds, the flow is lower than normal and the pressure
goes up.
The best way to confirm the oxygen is a direct oxygen concentration measurement
is perhaps with a hand-held device like the MiniOx. Information about them can
be found at www.msanet.com . Salter Labs has one called the PrO2 Check Elite at
www.salterlabs.com that not only checks concentration but also flow and pressure.