SEC DIR Dual Gas Analyzer0 pages

SEC Signature DIR
Dual Infrared Process Gas Analyzer
Features

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Capable of non-intrusive continuous monitoring for 2 different gas vapors
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 system (patented)
Linear outputs
Programmable heated optical chamber
Independent pressure compensation input
Operates in anaerobic atmospheres
Continual self diagnostics
Dedicated 4 to 20 mA output for each channel

Operation / Description
The SEC Signature DIR is a self-contained dual chamber 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 DIR 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 DIR employs a reliable, directly opposed optical system. No mirrors or reflecting surfaces
are used in this device. All optical surfaces are heated to discourage measurement error due to condensation. Rugged 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