Gow-Mac 580 series, Operating Manual

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GOW-MAC Instrument Co. 52
3. Capillary Detector
The capillary detector is a micro TCD optimized for capillary column gas chromatography on
the basis of column effi ciency, peak shape, detector signal to noise ratio and linearity. It is
made of stainless steel and uses detector elements of a special alloy wire. Check the
“Replacement Parts List” for replacement detector/ fi laments.
D. The Preparative GC Collection System (Options 205, 206, or 208)
The system consists of four major components: (1) a temperature control unit, (2) a stainless
steel column adapter with 6-32 npt female threads for connection to the heated exit port and
found to accept a male
5/5 joint, (3) a collection tube possessing a 5/5 end, and (4) 100

L
conical vials with threaded necks ground to a 5/5.
The operation of the system is carried out in the following manner:
1. Temperature Control - The temperature of the heated exit ports is achieved with a separate
control unit mounted on the outside left of the instrument. Included in the temperature control
unit is:
- Dial to set the temperature
- Meter for temperature readout
- On/off indicator light
NOTE
)
METER IS NOT A DIRECT TEMPERATURE READOUT
AND TEMPERATURE SHOULD BE DETERMINED BY
EXPERIMENTATION.
2. The column adapter is attached to the column exit port of the GC instrument which is located
directly after the hotwire detector (front, left). The heated exit port is threaded to match the
6-32 adapter.
MOST IMPORTANT!
The threads of the exit port must extend suffi ciently along the exit port
section of the column so that the end of the column will extend well into the ground standard
taper part of the adapter when it is attached to the exit port.
This arrangement will allow the end of the exit port to butt snugly against the collection tube
when fully assembled. IT IS ABSOLUTELY ESSENTIAL THAT THIS CONTACT IS MADE.
3. When the recorder indicates that the fraction to be collected is approaching the end of the
columns, the collecting tube (previously cleaned and dried) is seated into the stainless steel
adapter.
4. The assembled adapter and collection tube are then translated along the exit port tubing by
rotating the adapter until the exit port butts against the end of the collection tube. If too much
pressure is applied by the rotation of the adapter, the collection tube will unseat. It is
important to practice rotating the collection tube GENTLY to obtain just enough pressure to
make a good seal, but not too much to unseat the joint.
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