- 品牌：BETA (荷兰)
- 完整型号：C3-P502H-S2N-S4-G1-I
- 外壳类型代码 (C3)：C3型 铝合金外壳 (IP66 / NEMA 4X 防护等级)，适用于本安型 (Intrinsically Safe) 防爆环境
- 量程范围代码 (P502H)：高压隔离活塞式压力范围
- 微动开关代码 (S2N)：双刀双掷 (DPDT) 银触点微动开关
- 膜片/O型圈材质 (S4)：316L不锈钢膜片配焊接式密封结构
- 工艺连接代码 (G1)：1/2" NPT 内螺纹工艺接口
- 认证/选项代码 (I)：ATEX / IECEx 本安防爆认证 (Ex ia)
- 额定防护等级：IP66
- 工作温度范围：-30℃ 至 +80℃ (视具体介质调整)
- 产品净重：约 1.65 kg (含标准安装支架)
- 包装总重：约 2.10 kg
- 荷兰BETA自控仪表在工业压力与温度监测领域久负盛名。C3-P502H-S2N-S4-G1-I是一款专为严苛工业现场设计的高性能、高可靠性防爆压力开关。该开关的核心优势在于其自对中的弹簧活塞传感器结构。这种设计将工艺介质与内部微动开关完全隔离，在承载高静压以及抵抗剧烈压力脉动方面表现极为卓越。其特有的弹簧负载活塞设计，赋予了设备出色的抗震动与抗冲击性能，能够有效避免由于管道振动或现场轻微颠簸导致的开关误动作。
在外壳工艺方面，该型号采用C3级坚固的铝合金铸造外壳，表面涂覆有高抗腐蚀性的环氧树脂涂层。外壳具备坚固的密封盖、不可脱落的紧固螺钉以及一体式橡胶垫圈，防护等级达到IP66（符合NEMA 4X标准）。这使它能够轻松抵御盐雾、酸雨以及高湿度等恶劣户外环境。内部接线端子排设计合理，带有标准的接地端子，方便现场技术人员进行安全快捷的接线。
在电气性能与材质配置上，本型号配置了S2N双刀双掷（DPDT）微动开关。这使它能够同时输出两组独立的开关信号，既能用于联锁报警，也能同时传输给DCS或PLC系统进行逻辑控制。触点采用优质银材质，具有极低的接触电阻和出色的耐电弧磨损性能。针对腐蚀性或高压介质，该机型选用了S4级别的316L不锈钢膜片，采用全焊接式的密封结构，杜绝了常规O型圈在极端工况下可能发生的硬化、溶解或老化泄漏风险。工艺接口为通用的G1（1/2" NPT内螺纹），能够完美匹配主流化工、石油管道。此型号通过了严格的本安防爆认证（后缀I，含ATEX与IECEx等多国认证标准），是易燃易爆气体、蒸汽等危险区域的理想控压选择。
行业应用方面，该产品广泛应用于石油天然气开采、炼油化工、海上钻井平台、大型锅炉蒸汽系统、液压润滑站以及电力行业的重型轮机控压。在实际选型中，若需要单刀双掷（SPDT）或不同的电气容量，可参考推荐同系列其他规格。
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