GE Analytical Instruments ©2006 11-7 DLM 14291 Rev. A
To secure the tubing to the purge vessel, hose clamps are provided with the purge
vessel. In most locations, cold tap water can be used for the condenser. Connect a
length of Tygon or rubber tubing to a barbed fitting on a faucet, place a hose
clamp over the end of the tubing and connect the tubing to the bottom barbed
fitting on the condenser. Wetting the barbed fitting on the condenser with water
will aid in sliding the tubing over the fitting. Slide the tubing over as much of the
barbed fitting as possible. Once the tubing is installed, carefully tighten the hose
clamp to secure the tubing. Do not overtighten the hose clamp; the glass will
break.
Connect a second piece of tubing to the barbed fitting on the top of the
condenser, secure the tubing with a hose clamp, and place the other end of the
tubing in a drain.
The hot water supply for nitrate measurement must be supplied from a circulating
water bath capable of heating to ~95 °C. Use the silicon tubing provided with the
purge vessel to make the connections between the water bath and the barbed
fittings on the purge vessel. Tygon tubing expands when heated and is not
recommended. Connect a piece of silicon tubing from the outlet of the water
bath, place a hose clamp over the tubing and connect the tubing to the bottom
barbed fitting on the purge vessel heating jacket. Wetting the barbed fitting on
the condenser with water will aid in sliding the tubing over the fitting. Push the
tubing on the barbed fitting as far as possible and secure the tubing with a hose
clamp. Connect a second piece of silicon tubing to the top barbed fitting on the
heating jacket, pushing the tubing as far as possible onto the barbed fitting and
securing with a hose clamp. Connect the other end of the tubing to the inlet
fitting on the water bath.
This completes the installation of the Purge Vessel. Procedures for preparing the
chemical reducing agents, adjusting the purge gas flow rate and analysis of
samples are in Chapters 12 – 14.
Dilution of Anti-foaming Agent
Included with the purge vessel is a small vial containing a silicon emulsion, anti-
foaming agent. This material must be diluted 1:30 with deionized water and 100
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