| The
Differential Pressure Gauge displays the difference in air
pressure between the inside and outside of a shelter. It
has a sampling tube that goes through the wall or ceiling
in order to read the outside air pressure. Another sampling
tube is inside the housing and the difference in air pressure
is displayed by a needle on a dial gauge. When you do not
have the Safe Cell NBC overpressure air filter on, a properly
installed differential pressure gauge will read zero because
there is no difference in the air pressure inside, and outside
of the shelter. When you start the Safe Cell, the gauge
will read a higher pressure.
The
unit of measure displayed is inches of water column (wc).
There are 27.67 inches of water in one pound per square
inch (PSI).
Air
flow and air pressure are two properties of forced air that
are linked together. As a general rule, the more air pressure,
the less air flow. An airflow of 5 cubic feet per minute
per person at 0.3-inch (7.62-mm) of water column is recommended
by the United States Army Corps of Engineers in the technical
letter ETL
1110-3-498.
There
are three ranges of gauges available that display positive
overpressure:
- Zero
to 0.5-inches of water column - PN: ASR-05-DPG
-
Zero to 1-inch of water column - PN: ASR-10-DPG
(special order item)
-
Zero to 25-mm of water column - PN: ASR-25-DPG
(special order item)
Special
order items usually ship within one week of the order being
placed.
The
Differential Pressure Gauge is designed for easy installation
into any protected
space. The kit includes all of the required components for
installation inside of the protected space.
|
