SS2100 - CO2 Bulk Gas in N2/H2/Ar/He/CO2

Application Note

Bulk Compressed Gases
Carbon Dioxide is one of the most important impurities in high purity gases such as Nitrogen, Helium, Hydrogen and Argon.

Critical Control of Carbon Dioxide
Some of these bulk gases are manufactured by cryogenic processes. Others are cleaned of CO2 using fixed bed molecular sieves or acid gas absorbents as part of the process. In any case, the CO2 content of the gas must be measured to ensure purity of the final product.

Traditional Measurement Solutions
Trace gas analyzers based on chromatographic separations and helium ionization type detectors have been used, but the detectors required are notoriously sensitive to ambient air leaks in permeation in the columns and fittings, so that maintenance is often a problem. Methanation and measurement by Flame Ionization detectors is one approach, but the high cost of consumables, such as columns, valves, carrier and detector gases makes the cost of these analyzer prohibitive, and GC measurements are inherently slow. Non-dispersive IR methods can be used, but long, folded-path cells to achieve the sensitivity required are expensive and the measurement is prone to interferences.

SpectraSensors’ Solution
SpectraSensors SS2100 is the ideal solution for bulk gas applications. Tunable Diode Laser technology means measurement interferences from other infrared absorbing compounds are avoided. There are no wet-up or dry-down delays, resulting in fast updates even when the concentration changes dramatically. The calibration is stable over the life of the analyzer. There are no consumable parts or supplies. The analyzer is virtually maintenance free and has a low cost of ownership.

Validation
The CO2 measurements can be validated using a certified standard of CO2 in a balance of Nitrogen.

Component	Unit	Typical Concentration	Min. for Application	Max. for Application
Carbon Dioxide (CO2)	ppmv	100	4	1000
H2O	Mole%	<0.01	0	0.5
Nitrogen (N2)	Mole%	99.99+	98.0	100
Helium (He)	Mole%	99.99+	98.0	100
Hydrogen (H2)	Mole%	99.99+	98.0	100
Argon (Ar)	Mole%	99.99+	98.0	100
Total	Mole%	100

 

The background stream composition must be specified for proper calibration and measurement performance. If other than a high purity gas, please specify the normal composition, along with the minimum and maximum expected values for each component, especially CO₂, the measured component. Other stream compositions may be allowable with approval from SpectraSensors. 

« Previous | Next »

Data Sheet

Performance
Target Components	CO2 in Compressed Gases (N2/H3/H2/Air) Specify Background Gas
Typical Measurement Ranges	≥0 – 200 ppm* (specify range)
Typical Precision	±2% of Full Scale
Measurement Response Time	1 to ~60 sec*
Principle of Measurement	Tunable Diode Laser Absorption Spectroscopy Non-differential
Environmental Temperature Range	-20º to 50ºC (-4º to 122ºF) -10º to 60ºC (14º to 140ºF) optional
Sample Inlet Pressure	70 kPag (10 psig) typical 210 kPag (30 psig) maximum
Cell Temperature	Maintain at 50ºC +/- 0.2ºC
Maximum Cell Pressure	70 kPag (10 PSIg)
Sample Flow Rate	3 - 4 L/min (6.4 to 8.5 scfh)*
Validation	Certified blend of CO2 in Nitrogen balance
Electrical
Power	100-240 VAC, 50-60 Hz standard
Max Current	Controller: 1 A @ 120 VAC
Controller to Cell Cable Length	1m standard (3m, 5m & 10m available optionally)
Communication	Current Loop Output 4-20 mA Isolated, 1200 ohms @ 24 VDC max load Serial: ASCII Text RS232C standard Modbus RS232C
Digital Outputs	4 ea. 12 VDC for valve operations Scrubber (if required), Process/Val, Val 1, Val 2 5 SPDT (Form C) Dry Contact Alarms Common Fault, Val 1 Active, Val 2 Active, Val Fail, one user-assignable to any alarm
LCD Display	Concentration, Cell Pressure and Temperature, Diagnostic Data
Physical
Controller Enclosure	NEMA 4X - 304 Stainless Steel standard
Controller Dimensions	343mm H x 305mm W x 165mm H (13.5" H x 12" W x 6-7/16" D)*
Weight Approximately	13.1 Kg (28.6 lbs)*
Sample Cell Dimensions	8m Herriot Cell 559 mm H × 127 mm W (22” H × 5” W)
Sample Cell Construction	316L Series Polished Stainless Steel standard
Number of Sample Cells	1 (single channel SS2100) or 2 (dual channel SS2100)
Area Classification	CSA Certified for Class I, Division 2, Groups ABCD Temp Code T3C  ll 2G Ex d llB+H2 T5; Tamb : -20 ÷ +60 °C
Dimensions with Sample System	1678 mm H x 613 mm W x 427 mm D (66” H x 24-1/8” W x 16-13/16” D)
Weight with Sample System (approx.)	68 kg (150 lbs.)
* Application specific; consult factory

« Previous | Next »

Drawings

Typical Accessories

Photos

« Previous | Next »

Request a quote

« Previous | Next »