Trafag,8718,8728,8738,气体密度继电器,极低温SF6气体密度控制器 返回列表页

• Principle: Reference gas measurement参考气室测量原理
• For arctic temperatures, -76 to 176°F可用于北极温度-76 to 176°F（-60-80度）
• Exact switching following isochore精确的微动开关
• Excellent vibration resistance优越的抗振性
• No false alarms at low temperatures极低温下不存在任何误报警
• Stainless steel or aluminum sensor不锈钢或铝传感器
• Galvanically separated circuits分立电路
• Switch point adjustment in factory工厂设定
• High/Medium Voltage应用于GIS系统高中压范围
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• Trafag,8718,8728,8738,8748,气体密度继电器,极低温SF6气体密度控制器

• 北极温度SF6气体密度继电器,SF6气体密度控制器

    Application
    High voltage technology

   Main characteristics

    Gas Density Monitor for SF6 and other gases
?  Principle:                     Reference gas measurement
?  Measuring range:               0...1.1 MPa （0...1100 kPa）
?  Output:                        floating change-over contact
?  Switch point:                  factory calibrated

   Main features
?  For arctic temperatures:  –60...+80°C
?  Switching signal in case of liquefaction of gas
?  Exact switching following isochore
?  Excellent vibration resistance
?  No false alarms at low temperatures
?  Stainless steel sensor
?  Independent, galvanically separated circuits

   Ordering information

    Specifications

    Main characteristics

    Principle:                    Reference gas measurement
    Measuring range absolut:      0...1.1 MPa（0...1100 kPa）
    Output:                       floating change-over contact
    Switch point:                 adjustment in factory

   accuracy （@ 20°C）
    Reference pressure <650 kPa abs.: ± <10 kPa
                                  @ -30...+50°C
    Reference pressure >650 kPa abs.: ± <12 kPa
                                  @ -30...+50°C

   accuracy of indicator
    SF6 Indicator dial
      Accuracy of indicator within numeralised
      range:                      ± 10 kPa @ 20°C
    Low pressure indicator
      Accuracy of indicator within numeralised
      range:
        @ 0 kPa relative:         ± 20 kPa
        >200 kPa relative:        ± 10 %

   Micro switch
    Rating:                       see table
    Resistance of insulation:     > 2 MΩ
    Dielectric strenght:          2 kV terminal to ground
    Life time （mechanical）
      micro switch 20:            1 Mio. cycles
    max. difference from the lowest to the highest
      switch point:               130kPa
    Switching differential typ.
      micro switch 20:            <15 kPa
        for indicating range or switching distance
        > 80 kPa:                 <15 kPa

   Electrical connection
    Screwed cable gland:          see accessories
    Terminal screw:               plugable, 0.2...2.5 mm2

   Environmental conditions
    Ambient temperatur:           –60...+80°C
    Media temperature             –60...+80°C
    Protection:                   IP65
    Humidity:                     max. 95% relative
    Vibration
      Min. Difference from switch point: 5 kPa
      20...80 Hz:                  4 g

    Choc:                          50g/ 11ms

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