SS2100 - H2O in Bulk Gas in N2/H2/Ar/He/CO2

Application Note

 Bulk Compressed Gases
Moisture is one of the most important impurities in high purity gases such as Nitrogen, Helium Hydrogen, Argon and Carbon Dioxide. These gases are frequently used because water from the atmosphere can damage equipment or a process.

Critical Control of Moisture
Some of these bulk gases are manufactured by cryogenic processes. Others are dried using fixed bed desiccant driers as part of the process. In any case, the moisture content of the gas must be measured to ensure purity of the final product.

 Traditional Measurement Solutions
Aluminum Oxide capacitance probes and vibrating quartz crystal moisture analyzers have been the traditional method for monitoring the levels of moisture at desiccant dryer outlets, or in the final product. Unfortunately, capacitance probes change their response over time even without contamination, and since they cannot be recalibrated in the field, they must be replaced. It’s not uncommon for moisture probes to be replaced multiple times a year. Quartz crystal moisture meters have slow wet-up and dry-down times that are slow to detect break-through from the dryers.

SpectraSensors’ Solution
SpectraSensors SS2100 is the ideal solution for dry bulk gas applications. Tunable Diode Laser technology means that 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 (Fig. 1). 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

Component	Unit	Typical Concentration	Min. for Application	Max. for Application
H2O	ppmv	<10	0.05	100
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
Carbon Dioxide (CO2)	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 water, the measured component. Other stream compositions may be allowable with approval from SpectraSensors.

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Data Sheet

Performance
Target Components	H2O in Compressed Gases (N2/H3/H2/Air/CO2) Specify Background Gas
Typical Measurement Ranges	0 – 25ppm 0 – 10 ppm (other ranges available by request)*
Typical Precision	±0.05ppm*
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	A certified blend of H2O in Nitrogen balance is diluted with dried sample in the sample conditioning system under flow control
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	28m Herriot Cell 559 mm H × 127 mm W (22” H × 5” W)
Sample Cell Construction	316L Series Polished Stainless Steel standard SilcoNert® coated
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

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Drawings

Typical Accessories

Photos

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