News · 2026-05-09
How to Match Resistance for SiC Heating Elements
Technical Video
SiC Heating Element Resistance Matching Explained
A short technical video explaining why SiC heating element resistance should be reviewed at operating temperature and matched by circuit layout.
Watch on YouTubeResistance matching is important when SiC heating elements are installed in groups or replaced during furnace maintenance. Poor matching can overload some elements and reduce service life.
Measure resistance at the right temperature
Room-temperature resistance cannot represent the high-temperature resistance of SiC elements. Resistance should generally be measured at a steady temperature of 1000℃ or above, then calculated from measured voltage and current.
Series and parallel matching rules
| Connection method | Technical recommendation | Maintenance note |
|---|---|---|
| Series | Resistance range within +/-5% | More sensitive to mismatch; limit to 2 elements above 1400℃. |
| Parallel | Resistance range within +/-10% | Generally preferred because small differences tend to balance with use. |
| Replacement after short service | A new element with higher resistance may be used | Record the old element values for future grouping. |
| Replacement after long service | Replace the whole group | Mixing new and aged elements may overload part of the group. |
Keep useful records
When replacing elements, record voltage and current readings and mark the increased resistance value on the cold end if possible. For a new quote, send old element photos and electrical data through the RFQ form.
FAQ
How should SiC resistance be measured?
Measure at a steady temperature of 1000℃ or above and calculate resistance from voltage and current.
What is the matching tolerance for series connection?
For series connection, keep resistance values within +/-5%.