指针压力表选购前确认事项有哪些
点击次数：14 更新时间：2026-07-25
指针压力表选购前确认事项有哪些?
①表売材质【前盖／背盖 或 整体】：SPCC 冷轧钢板、BsBm铜合金、SUS304不锈钢、SUS316不锈钢、SUS31L不锈钢、Aluminum鋁合金、ABS/PC塑料、PTFE / PFA全氟树脂．．等等。
②机芯材质（波登管压力表）：BsBm铜合金、SUS304不锈钢、SUS316不锈钢、SUS31L不锈钢
③螺纹材质：BsBm铜合金、SPCC钢+表面电镀、SUS304不锈钢、SUS316不锈钢、SUS31L不锈钢
④表売內部是否【填充油】：【甘油封入】：环境温度：+5℃ ～55℃ 【硅油封入】：环境温度：40℃ ～ +200℃
⑤是否【耐震】制作： 干式耐震压表（无充油型耐震制作）／ 湿式耐震压力表（充油型耐震制作)
⑥是否【耐热】制作
⑦介质是否为【蒸气】使用
⑧是否需要【禁油】制作
⑨是否需要【禁水】制作
⑩是否需要【禁油&禁水】制作
⑪接口螺纹规格【准备一把油标卡尺去测量】螺牙的圆柱直径φ
通常常规的~~螺纹有分为【平行螺纹G=PF】或【锥形螺纹R=PT】
⑫刻度面板上,是否有特殊塗颜色制作
| 颜色 | 含义 | 适用区间 | |
|---|---|---|---|
| 绿色 | | ✅正常允许运行区间 | 压力在此区间：设备工况稳定，各项参数达标，可以持续运转。搭配电接点压力表：绿色区间 = 下限触点 ～ 上限触点之间。 |
| 黄色 | | ⚠️警戒区间（注意域） | 压力进入黄色：参数偏离标准，属于异常前兆；设备还可以短时运行，需要尽快排查原因、安排检修，不建议长期持续运转。常用于：一级预警区间（上上限 HH 第一点、下下限 LL 第一点）。 |
| 红色 | | ❌危险区间（禁止运行） | 超压 / 失压，禁止长期运行，需紧急处置。 |
⑬是否为【电接点／开关】制作：下限型／上限型／上下限型／上上限型／下下限型
⑭指针压力表下方是否有【隔膜装置】：螺纹连接型／法兰连接型／卫生卡箍型（快装）／加长颈式（延伸凸台）
⑮除了以上，或有其它特殊制作要求。
压力表现场判定：实物照片 + 工况信息综合判断标准
一、核心结论
只凭文字描述容易出现理解偏差、选型失误；实物照片 + 现场环境信息 结合核对，可大幅提升判断准确率，减少选型错误、退换货风险。
二、拍照建议（4 类照片缺一不可，发给供应商 / 技术确认）
❶压力表正面完整照片
✅要求：清晰拍到表盘、量程、单位、品牌、色区、指针、有无电接点作用：确认量程、表盘规格、是否色分目盛、有无接点、刻度标准；区分干式 / 充油（观察有无注油栓、内部有无阻尼液）。
❷压力表侧面 & 背面照片
✅拍到：外壳、螺纹接头、注油栓、安装形式（径向 / 轴向埋入）重点识别：外壳材质、螺纹规格、接液外露部分、是否直装隔膜、有无毛细管。
❸管路安装整体实拍（现场环境照）需要看清：
㊀安装位置：液压站、注塑机、户外、冷库、高温设备
㊁振动大小：是否靠近油泵、冲击负载
㊂管路介质：液压油、水乙二醇、清水、腐蚀性药液
㊃环境温度：常温 / 高温 / 冬季低温户外
㊄有无冷凝水、水雾、盐雾
Checklist Before Purchasing Pointer Pressure Gauges
① Case Material [Front Cover / Back Cover or Integrated Housing]: SPCC cold rolled steel, BsBm brass alloy, SUS304 stainless steel, SUS316 stainless steel, SUS316L stainless steel, Aluminum alloy, ABS/PC plastic, PTFE / PFA perfluoropolymer, etc.
② Movement Material (Bourdon Tube Pressure Gauge): BsBm brass alloy, SUS304 stainless steel, SUS316 stainless steel, SUS316L stainless steel
③ Thread Material: BsBm brass alloy, SPCC steel with electroplated surface, SUS304 stainless steel, SUS316 stainless steel, SUS316L stainless steel
④ Internal Filling Liquid for Case:【Glycerin Filled】Ambient temperature: +5℃ ~ +55℃【Silicone Oil Filled】Ambient temperature: -40℃ ~ +200℃
⑤ Vibration-resistant Construction: Dry-type vibration-resistant gauge (non-filled vibration-resistant) / Wet-type vibration-resistant gauge (liquid-filled vibration-resistant)
⑥ High-temperature Resistant Construction Required or Not
⑦ Application Medium: Steam service or not
⑧ Oil-free Construction Required or Not
⑨ Water-free Construction Required or Not
⑩ Oil-free & Water-free Construction Required or Not
⑪ Connection Thread Specification [Measure thread outer diameter φ with vernier caliper]Common thread types: Parallel Thread (G=PF) / Taper Thread (R=PT)
⑫ Custom Color Zone Marking on Dial Required or Not
Meaning & Operating Range of Color Zones
🟢 Green✅ Normal operating range. Pressure within this range means stable equipment operation with qualified parameters for continuous running.For contact pressure gauges: Green zone = Range between low-limit contact and high-limit contact.
🟡 Yellow⚠️ Warning range. Pressure entering yellow zone indicates deviated parameters and early signs of abnormality.Short-term operation is allowed; troubleshooting and maintenance shall be arranged promptly. Long-term continuous operation is not recommended.Commonly used for primary warning range (1st setpoint of HH High-High / LL Low-Low contacts).
🔴 Red❌ Danger range (operation prohibited). Overpressure / underpressure condition. Long-term operation is forbidden; emergency action is required.
⑬ Electrical Contact / Switch Configuration: Low-limit type / High-limit type / High & Low limit type / High-High limit type / Low-Low limit type
⑭ Diaphragm Seal Device at gauge inlet: Threaded connection / Flange connection / Sanitary clamp connection (quick-fit) / Extended neck type
⑮ Any other special customization requirements beyond above items.
On-site Identification Standard for Pressure Gauges: Comprehensive Evaluation with Physical Photos + Operating Condition Information
1. Core Conclusion
Relying solely on textual description may cause misunderstanding and wrong selection. Cross-verification combining physical photos and site condition information greatly improves identification accuracy, reduces selection errors and return & exchange risks.
2. Photograph Guidelines (4 sets of photos are mandatory for supplier / technical verification)
❶ Full front photo of pressure gauge✅ Requirements: Clearly capture dial, measuring range, unit, brand, color zones, pointer and contact presence.Purpose: Confirm range, dial specification, color marking, contact configuration and scale standard; distinguish dry / liquid-filled type (check filling plug and internal damping liquid).
❷ Side & rear photo of pressure gauge✅ Capture housing, thread socket, filling plug and mounting type (radial / back flush mounting).Key identification points: Housing material, thread specification, exposed wetted parts, direct-mounted diaphragm seal, capillary presence.
❸ Overall piping installation photo (site environment)Need to clearly show:① Installation location: Hydraulic station, injection molding machine, outdoor site, cold storage, high-temperature equipment② Vibration level: Whether installed near oil pumps or impact loads③ Process medium: Hydraulic oil, water-glycol, fresh water, corrosive chemical fluid④ Ambient temperature: Normal temperature / high temperature / outdoor low temperature in winter⑤ Presence of condensate, water mist or salt spray
