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SEC DIR Dual Gas Analyzer
The SEC Signature DIR is a standalone dual channel optical gas analyzer designed for nonintrusive
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 gas concentration as well as unit status. 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.
SEC DIR Dual Gas Analyzer Features
| • |
Capable of non-intrusive continuous monitoring for 2 different gas vapors |
| • |
Infrared
sensing technology |
| • |
Designed
for non-extractive 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
output |
| • |
Heated
optical surfaces |
| • |
Programmable
heater |
| • |
Operates
in anaerobic atmospheres |
| • |
Continual
self diagnostics |
| • |
Dedicated
4-20 mA output for each channel
|
| • |
Multi-beam sensing technology (patent pending) |
|
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SEC DIR Dual Gas Analyzer Applications
| • |
Medical
Device Sterilization Monitor |
• |
EtO/Water Vapor Analyzer |
Specifications
| MODELS |
|
EtO/H2O
Hydrocarbon/H2O
CO2/Hydrocarbon |
 |
| ACCURACY |
|
±
5% of reading or ± 3% full
scale (whichever is greater) |
|
| CLASSIFICATION |
|
Class
1, Division 1, Groups B, C |
|
| CURRENT
DRAW |
|
(@
24 VDC) 1.0 A (average) |
|
| ENCLOSURE
CONSTRUCTION |
|
Anodized
aluminum and sapphire |
|
| HUMIDITY |
|
0-99%
(non-condensing) |
|
| INSTALLATION
CATAGORY |
|
Category
1, Pollution Degree 2 |
|
| MOUNTING |
|
3/4"
NPT |
|
| OPERATING
PRESSURE |
|
1
PSIA – 55 PSIA |
|
| OPERATING
TEMPERATURE |
|
-40° to 75°
C |
|
| OPERATING
VOLTAGE |
|
18-32
VDC |
|
| ANALOG
OUTPUT |
|
Ch 0: 0-20
mA (sourced)
Ch 1: 0-20mA (sourced) |
|
| DIGITAL
OUTPUT |
|
Interactive
PC link (white wire) |
|
| POWER
CONSUMPTION |
|
35
watts (maximum) |
|
| RANGE
(adjustable) |
|
EtO – 0-2000 mg/liter
Hydrocarbon – 0-100% VOL
CO2 – 0-100% VOL
H2O – 0-100 mg/liter
H20 - 0-300 mg/liter |
|
| REPEATABILITY |
|
±
2% |
|
| WEIGHT |
|
18 ounces |
|
| WIRE
CONNECTIONS |
|
Red
wire (+ 24 VDC)
Black wire (D.C. common)
Blue wire (4-20 mA output signal Ch 0)
Yellow wire (4-20 mA output signal Ch 1)
White wire (digital interface)
Brown wire (compensation input) |
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