双点差压开关选型：规格传感器材质及感压元件压力接口可调范围(bar)***大压力(bar)耐压(bar)J402K-S147B316不锈钢波纹管1/2″NPTF0.2-2.1-1-6.920.7J402K-S157B316不锈钢波纹管1/2″NPTF0.7-6.9-1-12.420.7J402K-147黄铜波纹管1/4″NPTF0.2-2.1-1-6.912.4J402K-157黄铜波纹管1/4″NPTF0.7-6.9-1-12.412.4J402K-455***橡胶膜片，O形密封圈1/4″NPTF12-200mbar-1-15.515.5J402K-456***橡胶膜片，O形密封圈1/4″NPTF0.1-1.4-1-15.515.5J402K-457***橡胶膜片，O形密封圈1/4″NPTF0.2-2.1-1-15.515.5)