Honeywell Vertex Operating Manual page 36

When monitoring a location, the system detects
and measures a specific gas or a family of gases
in the sample. The microprocessor in the analyzer
module interprets the data and responds
appropriately.
In the legacy detection system, the sample enters
the inlet and passes through the Chemcassette
tape to the sample outlet. The target gas
in the sample flow reacts with the tape and
produces a stain density proportional to the
gas concentration. An LED in the detector head
illuminates the sample stain and the detector then
optically measures the stain.
Legacy Detection System
Vertex Technical Handbook
V
ertex 72-Point Continuous Monitor
TM
Chemcassette tape
Sample outlet
CLO Detection System
In the Closed Loop Optics (CLO) detection
system, a reference detector monitors and
controls the intensity of the LED.
The microprocessor in the Chemcassette
analyzer module interprets the stain. It then
calculates and stores a precise concentration
level in the module's memory. Gas concentrations
are reported in parts-per-million (ppm), parts-per-
billion (ppb) or milligrams-per-cubic-meter (mg/
m ).
3
1-24
Reference detector
Surface mount LED
Light pipe
Detector
Inlet
Flow