SEC Signature Process Gas Analyzer0 pages

SEC Signature
Process Gas Analyzer
Features

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Capable of continuous monitoring for gas vapors
Low cost
Infrared sensing technology
Designed for nonextractive sampling installation
Virtually maintenance free
Explosion proof
Immune to poisoning and etching
Designed for harsh environments
Compact and lightweight
Fast response time
Simple calibration
Self-compensating optical bench (patented)
Linear output
Unaffected by humidity and pressure
Heated optical chamber
Low power consumption
Operates in anaerobic atmospheres
Continual self diagnostics
4 to 20 mA output

Operation / Description
The SEC Signature is a self-contained optical gas analyzer designed for non-intrusive continuous
monitoring of process gases. The infrared optical system is self-compensating for most aging,
environmental, and contamination effects resulting in excellent measurement integrity. An industry
standard analog output provides complete remote alarm, fault and calibration signals. The analog output
from the device can be connected to chart recorders, data acquisition systems or a process
control system.
The SEC Signature measures infrared light absorption due to molecular resonances. The monitor is
tuned to the infrared signature of the target gas or vapor, measuring light at wavelengths absorbed by the
target gas and at wavelengths not absorbed by the target gas. The gas concentration is determined by
calculating the ratios of the analytical and reference levels. Embedded linearization algorithms keep the
output accurate over the entire measuring range and embedded compensation algorithms maintain
measuring accuracy over changing environmental conditions.
The SEC Signature employs a reliable, directly opposed optical system. No mirrors or reflecting
surfaces are used in this device. The anodized aluminum surfaces of the optical chamber are heated to
discourage condensation. Sapphire windows protect the optics eliminating the corrosive effects found in
many process monitoring applications.
Once the unit is spanned to a specific mid range gas concentration (a one time operation), routine
calibration consists of only rezeroing the device periodically.
© 6/09