SS2100 - High Range H2O GTL/SynGas (Sasol Process)

Application Note

Critical Control of Moisture
Moisture must be removed prior to downstream cryogenic recovery and separation of the C2 and C3 hydrocarbons present. Fixed bed desiccant dryers are often used to remove the moisture (Fig. 1). Two beds are normal, with one in service while the other is being regenerated. Sometimes, two beds are used in series with a moisture monitor between the sample beds. When the first bed is exhausted it is regenerated and becomes the second bed after regeneration.

Traditional Measurement Solutions
Aluminum Oxide capacitance probes, electrochemical and vibrating quartz crystal moisture analyzers have been the traditional method for monitoring the levels of H2O in Desiccant Dryer Outlets. Unfortunately, trace hydrocarbons and other contaminants present in the stream contaminate the capacitance and electrochemical probes, resulting in high maintenance costs due to the need to be constantly 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 wet gas applications. Its non-contact laser and detector are impervious to damage from contaminants. 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. 2).

High water concentrations (>50 ppm) are easily measured without Differential Spectroscopy, so there are no consumable parts or utilities other than electrical power. The SS2100 has no routine maintenance requirement and laser diodes last for many years so the cost of ownership is very low.

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Data Sheet

Performance
Target Components	H2O in GTL/SynGas (Sasol Process)
Typical Measurement Ranges	20 - 100 ppm  through 0-1000ppm (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	1 - 2 L/min (2.1 to 4.2 scfh)*
Validation	Certified blend of H2O 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	0.8m cell 438 mm H × 108 mm W (17-1/4” H × 4-1/4” 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

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