CM4 Four-Point Continuous Monitor
CM4 Technical Manual
1-4
1.3 Detection System
The CM4 uses the patented MDA Scientific Chemcassette
®
detection
system. Chemcassettes
®
sample and detect a specific gas or family
of gases. The Chemcassette
®
detection system is included on an
analyzer plate on top of the CM4. The analyzer plate:
• Retains the Chemcassette
®
carrier
• Manages Chemcassette
®
transport
• Provides optical detection of stain
• Directs sample flow through the Chemcassette
®
Components of the detection system include:
• Chemcassette
®
carrier containing Chemcassette detection
tape
• Optics and electronics for the detection system
• Chemcassette
®
tape transport mechanism
1.3.1 Chemcassette
®
Carrier
The Chemcassette
®
carrier can be pre-loaded with Chemcassette
®
tape for rapid tape change.
1.3.2 Optics and Electronics
The heart of the Chemcassette
®
system is an optical detection system
that measures the stain that develops on the Chemcassette
®
tape.
The CM4’s unique design has four individual detectors, one for each
monitoring point. See Figure 1-3 for point stain location.
To monitor a point, the detection system detects and measures a
specific gas or family of gases in the sample. The CM4 interprets the
data and responds appropriately. See
on determining sample locations and
installing sample lines.
1
2
3
4
Chemcassette Tape
Monitoring Points
4
3
2
1
Monitoring Points
Chemcassette Tape
(as viewed in table top position)
(as viewed in wall mount position)
Figure 1-3: CM4 Point Stain Pattern
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