The SPS-3 supports up to two sample desorption (SD) modules and one internal standard (IS) module and is available in a single or dual SD module configuration each with a single IS module. 

The SPS-SD module allows for transfer of air samples collected on conventional-sized collection traps (1/4-inch stainless steel tubes with adsorbents) to micro traps for injection into a micro-bore capillary GC.  During this desorption process under gas flow and at temperatures up to 300 °C, the analytes are transferred from the conventional trap to PerkinElmer’s Custodion needle trap (Custodion-NT) for injection into the Torion T-9 GC/MS.  A complete module can operate from laboratory supplied gas (helium or nitrogen) and line power, or it can operate in the field from battery power and an internal tank of pressurized He gas.  

Custodion-NT devices can be used to achieve 10-50 ppb detection limits for many air-borne compounds. To achieve lower detection limits, samples are collected using conventional traps first and then transferred to the Custodion-NT using the SPS-3 SD module. Once the sample is concentrated on the Custodion-NT device it can be injected into the GC/MS for analysis.

The SPS-3 IS module contains a Calion IS vial from which internal standard (IS) vapor is generated. This allows the user to easily add the IS to a Custodion- NT with-out the need to carry liquid or gaseous external samples for use as internal standards. After a sample has been collected on a Custodion-NT, either directly or by thermal desorption from a conventional trap, the Custodion-NT containing the sample is introduced into the IS module where it is exposed to a known volume of IS vapor. The needle trap captures the IS and the needle trap containing the sample and internal standard is introduced into the GC/MS for semi-quantitative analysis of samples in the field.