Heated Pressurized Liquid Injection System

The HPLIS valve assembly is intended for the introduction of pressurized liquid samples containing very polar,  high boiling or high carbon number analytes into on-Line, at-Line or laboratory based Gas Chromatographs equipped with Split/Splitless capillary inlets or direct to column connections.
It has a reciprocating "HStem" with a machined groove (heated) at its lower extremity designed to contain the pressurized liquid sample to be analyzed.

• The "HStem" is moved from the load position (upper) to the inject position (lower) by an integrated pneumatic piston that is controlled by remote contact closure or manual operation of a front panel switch.
• In the load position, the "HStem" grove is positioned in the center of the sample chamber through which flows the pressurized fluid.
• In the inject position, the "HStem" groove is positioned in the sample transfer zone just below the lower seal.
• When HPLIS is activated, the "HStem" traverses the lower seal with the pressurized sample into the sample transfer zone where a synchronized/calibrated burst of electrical energy is applied to the sample groove.
• The sample flashes from the groove and is carried by the Helium carrier gas into the GC capillary inlet system. Heat for flash vaporization is supplied by the Power Control Module (PCM) and augmented by the Auxillary heater block and capillary inlet system that is operating at an elevated temperature compatible with the matrix to be analyzed.
  Once the sample has been successfully transferred to the capillary inlet system, normal capillary principles of gas chromatography are in control of the remaining analytical process.

SRA added-values

• ProChem software compatibility for on-line analyses supervision with Agilent Chemstation
• Independent heating from GC auxiliary location
• Stainless steel ventilated protection of the HPLIS valve
• Over heating alarm option

HPLIS was specifically designed for the above-described process:

• Can introduce pressurized liquid samples with very broad boiling range components; C2 to C40+
• Is pressure rated to handle the most demanding pressurized liquid sample; ethane (C2)
• Features a fast sample groove temperature rise time of <1.3 seconds
• Can be custom calibrated for specific sample groove temperature
• Has close coupling to the heated inlet (no cold transfer lines)
• Has a variety of "STEMS" (groove volumes) that can easily and quickly be changed to match the application requirements 
• Can be easily and rapidly removed for conversion to standard syringe injection 
• Has an integrated safety pressure switch
• Can inject rapidly or slowly without any change in GC performance
• Is compact and simplistic in design and operation
• Features "no flow interruption" during injection