Detection System - Honeywell CM4 Technical Handbook

CM4 Four-Point Continuous Monitor

1.3 Detection System

The CM4 uses the patented MDA Scientific Chemcassette
system. Chemcassettes sample and detect a specific gas or family
®
of gases. The Chemcassette
analyzer plate on top of the CM4. The analyzer plate:
• Retains the Chemcassette
• Manages Chemcassette
• 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
that measures the stain that develops on the Chemcassette
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.
CM4 Technical Manual
detection system is included on an
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carrier
®
transport
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®
system is an optical detection system
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Section 3.4 for instructions
Section 3.6 for information on
detection
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®
tape.
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1-4
Monitoring Points
1
2
3
4
Chemcassette Tape
(as viewed in table top position)
Monitoring Points
4
3
2
1
Chemcassette Tape
(as viewed in wall mount position)
Figure 1-3: CM4 Point Stain Pattern