MODEL nanodac™ Heat/Cool with Carbon Potential or Oxygen Level Monitoring using the nanodac Recorder/Controller Application Note
There are two control loops. In this application only one of these loops is used to control the temperature. A Zirconia probe is used to measure the level of oxygen and Virtual channels are configured to display the measured values.
The nanodac recorder/controller can accommodate a range of probes from various manufacturers. A suitable probe is the Eurotherm ECprobe which is interchangeable with all other carbon sensors. It is available in600mm or 900mmm lengths with or without integral thermocouple in types K, N, S, or R. A typical order code is CP600-K.
When mild steels or certain low carbon steels are heated at temperatures above 900°C in a carbon rich atmosphere the surface of the steel absorbs carbon by diffusion. The depth of carbon enrichment depends on the time and temperature of the treatment known as carburising. The presence of carbon in the steel causes a change in its physical properties.
A Zirconia probe is used to measure the level of oxygen. It generates a millivolt signal based on the ratio of oxygen concentration between the reference airside of the probe(outside the furnace) and the amount of oxygen actually inside the furnace.
The temperature of the furnace is measured using athermocouple. This may be a thermocouple mounted within the Zirconia probe or installed as a separate item.
Together the temperature and oxygen level signals are used by the nanodac recorder/controller to calculate the actual percentage of carbon in the furnace atmosphere.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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September 10 |
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Issue 1 |
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HA030817U002 |
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778 KB |
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