Connecting The Tubing; Gas Drying Unit - Mettler Toledo DO307 Mode D'emploi

4.2

Connecting the tubing

4.2.1 Gas drying unit

As the purge gas used must be 100% dry, we recommend to dry it before it flows into the oven using the
gas drying unit (standard equipment). The drying agents silica gel and molecular sieves shown in the
diagram are not part of the standard equipment; you must connect the connection tubing yourself.
Tubing connection for gas
inlet of the oven
length 32 cm
Connection
to oven
2nd bottle:
molecular sieve
– First fill the bottles: Fill the 1st bottle with silica gel whose capacity for water uptake is higher; fill the
2nd bottle with 3 Å molecular sieve to trap the remaining water.
– Connect the flow meter to the 1st bottle with the 27 cm tubing: Press the ends into the quick fit
connectors. In the case of the bottle; make sure to use the connection which leads the gas to the
base of the bottle.
– Connect the 1st bottle and the 2nd bottle with the 21 cm tubing: In the case of the 2nd bottle insert
the tubing in the connection which leads the gas to the base of the bottle.
– Connect the 2nd bottle and the gas inlet.
Hose connector with barbed fitting
Quick acting coupler
DO307
METTLER TOLEDO
Clamping ring
Flow meter
Connection tubing
length 21 cm
Connection tubing
length 27 cm
Male stud fittings
1st bottle: silica gel
Gas supply to
bottle base
Bypass
Gas coupling
– To loosen the tubing, press on the clamping
rings with your fingertips and take out the
tubing.
– Connect the hose connector with barbed
fitting to the gas source using tubing.
– Set the gas flow rate (200 – 250 mL/min) on
the flow meter.
– To detach the hose connector, press the
quick acting coupler in the direction of the
arrow.
Installation
7