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DESCRIPTION OF PRODUCT
The 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 a single point of use.
It consists of two controllable valves that direct the flow of gas into a delivery regulator.
Pressure coming into the 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 a knob on the front panel.
A series of indicator lights show the status of the system at any given time.
The status of the IntelliSwitch may be monitored remotely via a serial port. In addition, the IntelliSwitch can
interface with any of the CONCOA Remote Alarms.
There are two basic models of the IntelliSwitch. One uses the delivery gas to activate the valves used for bank
switching. The other uses compressed air or an inert gas to activate the valves used for bank switching.
Each model features several different versions targeted at the pressures and flows of specific applications.
FEATURES
Operation from Multiple Gas Sources
The IntelliSwitch is capable of operating from 230, 350, and 500 PSI liquid cylinders, 4,500 PSI high
pressure cylinders, or any combination.
Look Back
The IntelliSwitch switches from one bank to the other based upon the pressure supplied to the selected bank.
When 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 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.
Switchback Delay
Using the Look Back feature alone can result in the switchover switching back several times well after the
cylinder can provide a useful gas supply. To prevent this, the Switchback Delay feature keeps track of how
often the IntelliSwitch switches back to a liquid cylinder that has been used and whose pressure has been
restored to be used again.
If the system switches away from the priority side before the Switchback Delay timer has timed out, the
system determines that all the useful gas has been extracted from the cylinder and switches to the auxiliary
side and draws from it.
Summary of Contents for INTELLISWITCH
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