The SRA Convoy system has been designed for sampling, enrichment and on-line VOC (Volatile Organic Compounds) thermal desorbing.

The system allows to:

• Determine concentrations of few ppb for each single component, in a continuous automatic cycle
• Increase the detection limit up to several orders of magnitude, according to the substance and the sampling time
• Avoid the injection of undesirable compounds such as water present in environmental samples, in the Micro GC module.

General features
Sorbent trap: different absorbent materials are available (examples: TenaxTA®, Tenax /Charcoal)
Tube rack:  interchangeable tube slot
Sampling flow: adjustable from 100 to 500 ml/min
Sampling temperature: typically 30°C, adjustable up to 100°C
Desorption temperature: adjustable up to 250 °C
Sample injection:  heated transfer line, adjustable up to 150°C
Transfer line to the Micro GC: heated transfer line, adjustable up to 150°C
Sampling system: internal pump, multi-way valves and heated internal lines
Cycle length: typically 6 minutes for the complete cycle: (thermal desorption  at 200°C) sampling, thermal desorption, injection, cleaning, analysis and cooling
Electrical connection: TTL and relay for communication with the Micro GC
Control and start: Windows ® dedicated software

PC Connections: RS-232 Serial
Power supply: 220 VAC or 12 VDC, 80W
Weight: 2 Kg
Size: about 230 x 285 x 70 mm.

Application fields
Geothermal Gas, landfill gas and biogas; air quality in the workplaces;  industrial emissions; industrial site reclamation; light hydrocarbons; aromatic  hydrocarbons (BTX, styrene, etc.); solvents (methanol, ethanol, acetone, isopropylacetone, propanol , THF, MEK, MIBK, ethyl acetate, etc.) sulfur compounds (H2S, COS), organochlorine compounds (dichloromethane, dichloroethane, carbon tetrachloride, trichlorethylene, etc.); miscellaneous products (acrolein, VCM, propionaldehyde, formaldehyde, ammonia, phosphine, ethylene oxide, acetic acid, etc.).
Quantitative and qualitative analysis of unknown substances in environmental emergency situations using MicroTD-MicroGC and Agilent mass spectrometer.