The AIR-300 is a microprocessor
based air quality monitor/controller utilizing a hot wire element
sensor based upon the Taguchi principle. This is a full spectrum sensor
sensitive to a wide variety of air pollutants such as carbon monoxide,
cigarette smoke, benzene, alcohols, hydrogen, hydrocarbons, esters,
This sensor is better suited to measuring air quality than a sensor
which measures only Carbon Dioxide. The AIR-300 yields a true indication
of the actual air quality, rather than occupancy. For example, if
a person were to smoke a cigarette in a room, the carbon dioxide sensor
would be inadequate in detecting this, even though the air quality
had significantly degraded. This same set of circumstances holds true
for many other contaminants such as Solvents, Fuels, and even Carbon
Monoxide, all of which are much more harmful than Carbon Dioxide.
When measuring Air Quality, it is not so much the type of contaminant
that is of concern, but rather the presence of any contaminants. This
sensor does not indicate which contaminant is in the air, but indicates
the presence and quantity of any contamination.
The Greystone AIR-300 monitor/controller works by looking at the signal
from a full spectrum sensor, automatically compensating for temperature
and humidity effects, and judging the degree of pollution. For the
unit to perform efficiently it must work as a monitor/controller,
i.e. it must be able to act upon level changes. The output is represented
as an analog, stepped or relay output with user adjustable settings.
This output can be used to directly control an actuator, or be sent
back to a Building Automation System (BAS).
The AIR-300 can be configured to run in auto or manual mode and has
an integral sensitivity adjustment to provide the user with the optimum
settings to monitor a specified area. There are internal LED indicators
to show microprocessor status and also a manual override feature to
assist in installing the unit.
||4-20mA, 0-10Vdc linear
for 0-100% pollution. 0-10 Vdc analog stepped and SPDT relay.
||0°C 40°C (32°F - 104°F)
||10% to 90% RH
||>5A @ 250Vac, 5A @
||Stepped Output (0-10Vdc)
||Stepped & Analog
(4-20mA or 0-10Vdc)
||Stepped & Relay
||Stepped, Analog &
- Executive Space
D - Duct