Exhaust Venting; Hot Air - Agilent Technologies ALS Handbuch

Exhaust Venting

During normal operation, the GC exhausts hot oven air. Depending on the
installed inlet and detector types, the GC can also exhaust (or vent)
uncombusted carrier gas and sample. Proper venting of these exhausts is
required for operation and safety.

Hot air

Hot air (up to 450 °C) from the oven exits through a vent in the rear. Allow at
least 25 cm (10 in) clearance behind the instrument, or 30 cm (12 in) behind a
Q-TOF GC/MS, and 76 cm (30 in) above the Ion Trap to dissipate this air.
Do not place temperature-sensitive items (for example, gas cylinders, chemicals,
WA R N I N G
regulators, and plastic tubing) in the path of the heated exhaust. These items will be
damaged and plastic tubing will melt. Be careful when working behind the
instrument during cool-down cycles to avoid burns from the hot exhaust.
For most applications, an optional oven exhaust deflector (G1530-80650, or
option 306) is available and can improve oven cooling by deflecting the
exhaust air up and away from the instrument. The exhaust deflector requires
14 cm (5.5 inches) behind the instrument. (For 7200 or 7250 Q-TOF GC/MS,
GC/Q-TOF exhaust deflector assembly G3850-80650 is provided.) For GCs
with the exhaust deflector option installed, the exhaust is about 65 ft
(1.840 m
(2.8 m
GC, GC/MS, and ALS Site Preparation Guide
3
/min). Without the deflector, the exhaust rate is about 99 ft
3
/min). The deflector outlet diameter is 10 cm (4 in).
7890 Series GC Site Preparation
3
3
/min
/min
25