With the continuous development of modern carbon potential control technology, the zirconia oxygen probe has become the main method of carbon potential control for controllable atmosphere carburizing and carbonitriding equipment. How to correctly use the oxygen probe in the controllable atmosphere heat treatment equipment is the key to the precise control of the carbon potential of the controllable atmosphere heating furnace. Today, technical engineers will analyze in detail the correct use of the zirconia oxygen probe in the controllable atmosphere heating furnace, let’s take a look! Use points:
1. Check the oxygen probe carefully
The zirconia oxygen analyzer and oxygen probe are high-sensitivity and high-precision sensing instruments. The core component of the zirconia head is easily broken by impact. Before using a new zirconia oxygen probe, we should carefully check whether the zirconia oxygen probe is bent and whether the oxygen probe has any signs of collision. Whether there are cracks in the outer tube of the zirconia oxygen analyzer probe, whether there are cracks or cracks in the zirconia at the probe site or ceramic-like fragments.
Second, the choice of installation location is very important
When installing the zirconia oxygen probe, the installation position must be inserted into the furnace chamber 50-100mm. The purpose of this is to fully ensure that it is installed in an area where the furnace gas is relatively stable. Don't be near the drip opening of various penetrants, near the fan, and don't install it at the door of the furnace, corners, or places with high vibration. If it is installed on the lid of a pit furnace, a protective sleeve should be added to the front end of the zirconia oxygen probe and the atmosphere should be well circulated. How to use the zirconia oxygen probe correctly in a controlled atmosphere heating furnace?
Three, maintain good airtightness
Pay attention to the oxygen probe mounting seat and the furnace shell to maintain good airtightness, do not leak. Use shielded signal wires for the oxygen probe connection. Do not ground the shield. Pay attention to the positive and negative poles of the wiring. The shielded signal wires are routed separately to prevent signal interference.
Four, avoid extreme cold and heat
The zirconia oxygen probe should be put into the furnace at room temperature as far as possible. As the furnace heats up to the operating temperature, it should not be rapidly cold or hot. Please handle it with care during installation. If you encounter special circumstances and need to pull out or insert the oxygen probe under high temperature conditions, the pulling out or inserting speed needs to be controlled within 30 mm/min. How to use the zirconia oxygen probe correctly in a controlled atmosphere heating furnace?
Five, try not to install and use in the case of insufficient pre-carburizing
When installing and using the zirconia oxygen analyzer probe, the zirconia probe needs to be pre-carburized for 8 to 24 hours. Try not to install the zirconia oxygen probe when the new furnace is just beginning to be pre-carburized.