Heated Zones (G1883) - Agilent Technologies G1289 Operating Manual

Introduction to Headspace and to the 7694 Headspace Sampler
The 7694 Headspace Sampler
motor–driven fan in the center of the carousel circulates the air to maintain
constant and uniform temperature. The carousel can be shaken to help
components elute into the headspace quicker. Mechanical rods move vials up
for removal by a robotic arm or for sampling.
Adapters (part no. 301–017–HSP) are required in the carousel when 10 ml vials
are used.

Heated Zones (G1883)

There are three heated zones. They are the vial oven, the loop, and the transfer
line. The vial oven is where the vial is heated during thermal and chemical
stabilization. Setpoint temperature range is between 40 and 200°C. At this
point, the needle has not pierced the septum. The loop zone is controlling the
temperature of the upper chamber, the valve, and the sample loop. The
setpoint range of the loop is between 50 and 200°C. It is recommended that the
loop temperature is kept 15°C higher than the vial temperature for most
operations.
Vial pressurization control*
Vial transport arm
Vial tray
* Standalone unit only
Figure 1. Overview of the 7694 Headspace Sampler (from front of instrument)
8
*
*
Carrier gas flow control
G1289/G1290
Vial pressurization control
Carrier gas flow control
Pneumatic
compartment
Keypad and display
G1883