The model A21 is a gas sample pumping system
designed to draw samples from ducts or hard to
access locations and deliver the samples to gas
sensors located in a more convenient area. A21
Sampling Systems use a high quality diaphragm pump
operated by a brushless DC motor to provide
continuous sampling over long periods of time.
Sampling pumps are rated for over 10,000 hours of
continuous operation and diaphragms in the pump
may be changed easily if necessary. The pump will
draw samples against a vacuum of up to 10”Hg. for
sampling negative pressure duct systems when
necessary.
In addition to the sampling pump, A21 systems
contain various components needed to insure reliable
sample measurement. A flowmeter mounted on the
front panel allows the user to adjust the sample
flowrate to the desired value, normally around 500
cc./min. Internal to the system is a loss of flow
detector that will warn of sampling system problems
that could compromise the gas measurement system.
A loss of flow alarm light on the front panel provides
local flow loss indication while an internal relay can be
used to indicate this alarm remotely.
Features

Product_Literature.pdf