Honeywell IQ Force Dock Reference Manual page 23

Connecting the Calibration Gas Cylinder to the Dock(s)
WARNING
Performing the fresh air calibration in a contaminated
atmosphere will lead to inaccurate and potentially dangerous
readings. Fresh air containing 20.9% oxygen and no
contaminants must be provided to the IQ Force dock for
instrument processing. If fresh air is unavailable in the immediate
area, steps must be taken to provide fresh air to the dock.
When a secondary fresh air source (either gas cylinder or sealed conduit) is
used with two or more IQ Force docks, a one-way check valve must be placed
in line between the common section of the fresh air manifold and each of
the docks to ensure the purity of the fresh air source. See
2.7.3.2.1 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 four), a one-way check valve must be
15
placed in the line between each T-fitting and dock to ensure the purity of
the fresh air source. See
The fresh air filter is not necessary when a gas cylinder is used to provide
fresh air to the dock(s).
2.7.3.2.2 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
Section 2.7.3.2.3.
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
Section 2.7.3.2.3
Section 2.7.3.2.3 below for further instructions.
below for further instructions.
IQ Force™ Dock Reference Manual