Concoa Medical IntelliSwitch 570 Series, Installation And Operating Instructions Manual, Page: 11 / 52

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DESCRIPTION OF PRODUCT
The Medical IntelliSwitch™ is a device used to monitor, control and switch the flow of gas from
cryogenic or high pressure cylinders from either of two independent sources to either of two
independently controlled and isolated delivery regulators. In turn these regulators are connected to a
single point of use output.
It consists of two electronically controlled inlet valves controlling the flow of gas into two
electronically controlled valves that in turn direct the flow of gas into one of two delivery regulators.
Pressure coming into the Medical IntelliSwitch™ is monitored and displayed on two independent 4-
digit displays. The outlet pressure of the system is monitored and displayed on a 3-digit display.
Outlet pressure adjustment is available using an adjusting screw on the delivery regulators inside the
cabinet.
A series of indicator lights show the status of the system at any given time.
The status of the Medical IntelliSwitch™ may be monitored remotely via a serial port or optional
Ethernet port. In addition, the Medical IntelliSwitch™ can interface with a CONCOA Remote
Alarm.
FEATURES
Operation from Multiple Gas Sources
The Medical IntelliSwitch™ is capable of operating with inlet pressure provided by 230, 350, and
500 PSI liquid cylinders, 3,000 PSI high pressure cylinders, or any combination.
Look Back
The Medical IntelliSwitch™ switches from one bank to the other based upon the pressure supplied
to the selected bank. When using liquid cylinders, if the volume of the liquid in the cylinder becomes
low or the gas flow becomes particularly high, it is not uncommon for the pressure to drop below the
switching point even if there is plenty of gas left in the cylinder. When a typical switchover enters
such a state, two undesirable situations may occur. First, the system may switch to the reserve
temporarily until pressure builds on the primary enough to cause the system to switch back. This
situation often leads to depleting both sides at the same time as the system rapidly alternates drawing
from both sides or even draws both sides at the same time. Second, the system may permanently
switch to the reserve leaving unused product in the primary and triggering a false alarm.
To avoid either of these situations, the Medical IntelliSwitch™ has a Look Back feature that allows
the system to switch banks and wait a predetermined time period before checking the former primary
cylinder. If the pressure has recovered enough, the system will switch back to the former primary
cylinder. This look back time allows the pressure building circuit to recover and build sufficient
pressure to supply the system and fully draw down the primary cylinder before an alarm is triggered
indicating the cylinder is empty, allowing maximum utilization of cylinder contents. This feature is
only activated when a liquid cylinder is selected for use. The look back time is factory set at 30
minutes.