HEATING DEVICE STATE MONITORING METHOD AND STATE MONITORING SYSTEM

To provide a heating device state monitoring method and a state monitoring system with which it is possible to suitably monitor the state of a heating device that includes a plurality of heating elements that are electrically connected in series.SOLUTION: A heating device that is used for heating glass includes a conductive path in which a plurality of heating elements are electrically connected in series. The heating elements are resistance heating elements having a heat generation part that generates heat by conduction of electricity. The heating device state monitoring method comprises a potential difference acquisition step (step S12), a monitoring information acquisition step (step S13), and an abnormality determination step (step S14) for determining the abnormality of the heat generation part involving an increase in the potential difference of the conductive path part. The potential difference acquisition step (step S12) acquires first potential difference of a first conductive path part and second potential difference of a second conductive path part that is different from the first conductive path part. In the abnormality determination step (step S14), determination is made as to the abnormality of the heat generation part on the basis of the fact that either of the first and second potential differences is relatively heightened.SELECTED DRAWING: Figure 3 【課題】電気的に直列接続された複数の発熱体を備えた加熱装置の状態を好適に監視することのできる加熱装置の状態監視方法、及び状態監視システムを提供する。【解決手段】ガラスを加熱する用途に用いられる加熱装置は、複数の発熱体を電気的に直列接続した導電経路を備える。発熱体は、通電により発熱する発熱部を有する抵抗発熱体である。加熱装置の状態監視方法は、電位差取得工程（ステップＳ１２）と、監視情報取得工程（ステップＳ１３）と、導電経路部の電位差の上昇を伴う発熱部の異常を判定する異常判定工程（ステップＳ１４）とを備える。ステップＳ１２の電位差取得工程は、第１導電経路部の第１電位差と、第１導電経路部とは異なる第２導電経路部の第２電位差を取得する。ステップＳ１４の異常判定工程では、第１電位差及び第２電位差のいずれか一方の電位差が相対的に高まることに基づいて発熱部の異常判定を行う。【選択図】図３