Detector Optics; Stain Pattern - Honeywell Vertex M User Manual

2.7.1 Detector Optics

The heart of the Chemcassette™ module is an optical detection system that measures a stain
that develops on the Chemcassette™ tape in the presence of a target gas. Each eight-point
Analyzer module has two detection heads, each with four individual detectors.

2.7.2 Stain Pattern

The following chart shows the stain pattern of sample detection on the Chemcassette™ tape.
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.
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