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Selection and applications4 min readContent language: ChineseUpdated 23 October 2026

差压变送器:介质名称为什么不够?

两侧所有接液结构都应核对兼容性。湿腿填充液也应纳入介质和材料清单。

直接回答与技术依据

两侧所有接液结构都应核对兼容性。同名介质可能有不同浓度、杂质、温度和清洗剂。接液材料应按实际成分和最不利工况选择

材料相容性由成分、浓度、温度与接触时间共同决定,主体耐腐蚀不能替代所有内部零件的核查。隔膜、焊口、密封圈及转接件可能接触不同介质,清洗时也可能形成新的最坏条件。假设同名酸液浓度提高后密封膨胀,不能用原低浓度验证继续保证。材料表应沿实际接液路径建立,未知组分应作为选型缺口保留。

适用条件与误差来源

弹性体、焊缝、隔膜和附件内部零件也可能接液。本类尤其要核实:湿腿填充液也应纳入介质和材料清单。

具体核对清单

  • 湿腿填充液也应纳入介质和材料清单,保存原始值及对应的运行状态。
  • 列出运行介质与清洗介质,在材料表上标出所有接液部件,比较前后保持其他条件一致。

假设案例与判断路径

假设一个差压变送器项目遇到以下情况:原料未改变,清洗液更换以后密封处开始渗漏。

若同样的条件变化能反复引出同样的差异,而恢复该条件后差异又消失,就有证据优先处理这一环节;若不能重现,应保留记录并检查其他因素。该案例为教学假设,结论不替代实际型号的适用性核实。

客户与销售如何交接结果

提供高低端取压图、最高静压、差压范围、引压介质及当前换算设置。采购确认时把这一条件写进技术要求,销售说明方案时同时交代适用边界,安装与调试人员才能使用同一个判断标准。

若用于替换旧设备,保留旧配置与新配置的差异表;若用于新项目,保留样品、结构图或运行状态与试验结果的对应关系。厂家文件用于确认指定型号的边界,现场验证用于检查实际安装及使用目标,两者不可相互替代。

Apply this knowledge to product selection

Customers and procurement

Check actual application and acceptance requirements against the article and product documentation. Bring open questions to DOWESTON for technical review.

Sales and technical teams

Record customer questions with application conditions. Verify range, interfaces and operating requirements against the selected model documentation.

Turn questions into application requirements

Collect application, connection, installation and acceptance requirements for the selected product, then review open points with DOWESTON.

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