1
Getting Familiar with Your TriPlus RSH
MHE Station
Thermo Scientific
TriPlus RSH User Guide
47
MHE Station
The MHE (Multiple Headspace Extraction) Station is an add-on passive module to extend
the range of headspace applications. See
Figure 35.
MHE Station
In a classical headspace technique, one sampling is performed per vial. Sample quantification
can be inaccurate in the presence of interfering matrices or in cases where a calibration
standard cannot be made using a matrix composition identical to that of the sample.
See the section
“Principles of Multiple Headspace Extraction (MHE)”
for details.
The MHE station consists of a venting tool (MHE Adapter) combined with a MHE Adapter
Holder. The MHE technique requires a series of sampling cycles using the same vial.
First, the vial is pressurized to reach a specific pressure. The vial is then sampled and vented.
The vial is re-pressurized and sampled again. This process is repeated multiple times to obtain
the final results. See the section
.
Table 14.
Operating and Environmental Requirements
Parameter
Requirements
Operating temperature range
Ambient, no control
Maximum relative humidity
80%, non-condensing
Vibration
To be tested
Static electricity
Negligible
MHE Adapter Holder
MHE Adapter
Needle
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