12
and each of the docks to ensure the purity
of the fresh air source. See the section
below titled “Fresh Air Manifold” for further
instructions.
Option 1: Using a Gas Cylinder to
Provide Fresh Air to the Dock
A calibration cylinder containing “zero air”,
which contains 20.9% oxygen and no
contaminants may be connected to the gas
port labeled “AIR” to provide fresh air to the
dock for calibration. The cylinder must be
equipped with a demand flow regulator.
The connection from the cylinder and
regulator to the dock may be made with
standard gas tubing.
For single docks, simply connect the “zero
air” cylinder and demand flow regulator to
the dock’s AIR port using standard gas
tubing. A check valve is not necessary
when a cylinder is used to provide fresh air
to a single dock. The fresh air filter is also
not required in this configuration.
For multiple dock setups (up to 4), a one-
way check valve must be placed in the line
between each T-fitting and dock to ensure
the purity of the fresh air source. See
“Multi-Dock Setups with Fresh Air Manifold”
below for further instructions. The fresh air
filter is not necessary when a gas cylinder is
used to provide fresh air to the dock(s).
Option 2: Using a Sealed Conduit to
Provide Fresh Air to the Dock
Fresh air may also be delivered to the dock
from a known fresh air source via a sealed
conduit that feeds directly from the source
into the AIR port on the dock.
For single docks, install the fresh air filter as
discussed above and simply plumb the fresh
air source directly into the dock’s AIR port.
For multiple dock setups in which fresh air is
provided to the dock via sealed conduit,
begin by installing the fresh air filter on each
dock. A one-way check valve must be
placed in the line between the t-fitting in the
fresh air manifold and each dock to ensure
the purity of the fresh air source. See
“Multi-Dock Setups with Fresh Air Manifold”
below for further instructions.
Multi-Dock Setups with Fresh Air
Manifold
For more information on this, see
Applications Note # AN20050722, which is
available at
http://www.biosystems.com
.
The 54-46-116 manifold is necessary for
use when more than one dock is to be used
with an external fresh air source, whether is
be a cylinder of “zero air” or a sealed
conduit to a fresh air source.
The 54-46-116 manifold is comprised of:
(3) small black T-fittings
(4) clear one-way check valves
(10) pieces of gas tubing 5” long
(1) piece of gas tubing 10” long
54-46-115 Tubing Assembly
1a. If the fresh air source is a calibration gas
cylinder, insert the Demand Flow
Regulator into the calibration gas
cylinder and proceed to step 2.
1b. If the fresh air source is a sealed conduit
from an external fresh air source, install
the fresh filter on each dock as
described above and proceed to step 2.
2. Modify the tubing assembly as follows
depending on how many docks will be
connected. If 4 docks will be used, no
modifications are necessary. For 2 or 3
docks, begin by separating the tubing at
the location described below.
Once this is accomplished, set the two
parts aside. The section that will be
used is shown in the following images
(depending on the number of docks).
Fresh Air Tubing for 2 Docks
