Ceramic heating rings are rated for 220V and 380V, and operate stably over the long term at temperatures up to 450°C. When selecting for injection molding machines, extruders, hot runner systems, and similar applications, design and selection personnel need to verify both parameter matching and on-site conditions. The common issues are explained item by item in the checklist below.
Point 1: Cross-check surface parameters against operating temperature. On-site maintenance personnel can first check the rated voltage, power, and maximum service temperature marked on the surface of the old ring, then compare them with the actual operating temperature. If the long-term operating temperature approaches the 700°C upper limit, confirm whether the heating ring material and wiring method meet the continuous operation requirements for that temperature range, rather than looking only at short-term peaks.
Point 2: Match the voltage class with the power supply circuit. The two rated voltages, 220V and 380V, correspond to different power supply methods. During selection, verify that the outgoing voltage of the equipment control cabinet matches the heating ring nameplate. In three-phase power supply scenarios, the load distribution of multiple heating rings should be as balanced as possible to avoid abnormal local temperature rise caused by single-phase overload.
Point 3: Verify installation space and heat dissipation conditions. When ceramic heating rings are used for pipeline heat tracing or heating the outer wall of a reactor, confirm that there are no obstructions around the installation position and that the heat dissipation clearance is reasonable. Mold heating and hot runner systems have compact spaces, so non-standard customization requirements should be proposed according to actual installation dimensions during selection to avoid forced assembly affecting contact heat transfer.
Point 4: Written confirmation of custom non-standard parameters. In scenarios such as lithium battery slurry heating and photovoltaic module freeze protection, power density, lead length, and lead exit direction often need to be customized. Design and selection personnel should confirm the customized parameters in writing, including rated voltage, power tolerance, and the maximum allowable continuous operating temperature, to facilitate subsequent maintenance cross-checks.
