The presence of a leak or oxygen getting into the furnace is detected by a low hydrogen reading. Oxygen itself cannot be detected after it has leaked into the furnace; it is consumed by the surface of copper and discolors it. The air leak is instead found by the low hydrogen reading. Experience has shown that at times the oxygen does not unite with the hydrogen and is still present. This is the reason the oxygen reading is necessary for complete analysis.
The 340WP analyzer is very useful for measuring atmospheres in a copper-brazing furnace. These atmospheres must be high in hydrogen in order to eliminate scaling and discoloration, as well as to ensure the proper fluxing of the solder.
In this case, the analyzer can be used both to measure the setting of the gas generator as well as for probing in various zones of the brazing operation. This ensures a proper atmosphere as well as aids in finding problems in atmospheres that are causing discoloration to the work.
Figure 1 shows a standard type of brass melting pot. These measurements also apply to kiln melting but the older brass melting pot is shown as an illustration. In this case, the gas burner is placed at the bottom of the pot and the flame circulates up around the pot and over the top of the molten brass. The protective atmosphere to reduce the dross is produced by the flame itself. An experienced operator would look at the flame coming out of the furnace and thereby judge the amount of hydrogen in the atmosphere.
|Figure 1 - Oxygen & Hydrogen Analysis in Brass Melting Operation|
Model 340 brochure...
We make gas analyzers for oxygen, hydrogen, carbon monoxide, carbon dioxide, methane, and many other atmospheric gases. We provide gas analysers for syngas, landfill gas, purity gas, biogas, and others.
Give Mike or Dave at Nova a call, or send us an e-mail.
sales at nova-gas dot com
websales at nova-gas dot com