Trafag,8774,SF6气体密度变送器,SF6混合气特高压气体密度传感器

    Trafag,8774,SF6气体密度变送器,SF6混合气特高压气体密度传感器

    基本技术参数:

    适用于SF6气体或是其它气体

    SF6气体密度变送器应用于高压及中压开关柜

    SF6气体密度变送器测量原理:石英晶振测量

    变送器测量精度:1.0

    温度信号精度:环境温度下±2°C,在 -40...85°C: ±3°C

    变送器输出:数字信号或是模拟电流

    Trafag,8774,SF6气体密度变送器,SF6混合气特高压气体密度传感器

• Continuous measurement数字信号可连续输出无飘移
• Protection IP65防护等级IP65
• No maintenance无需维护
• Compact紧凑型设计
• Vibration and shock-proof防振动和抗冲击
• Suitable for outdoor usage适合户外使用
• Response time <10ms与密度变化时响应时间<10ms

    Application
    High voltage switchgear

    Medium voltage switchgear

   Main characteristics

    Density Sensor for SF6 and other gases
?  Principle:           Oscillating quartz measurement
?  Measuring range:     0...60 kg SF6 /m3
?  Output
      Digital:           current pulses onto supply current
      Analogue:          current loop
?  Accuracy:            ±1.8% FS max.
                         ±1.0% FS typ.

    The Trafag gas density sensor type 8774 was specifically designed for surveying insulation gases.
    The gas density is measured with an oscillating quartz with excellent long term stability. The constant resonant frequency of a quartz oscillator
under vacuum is compared with the resonant frequency of an identical quartz situated in the sample gas. The difference in the resonant frequency is proportional to the density of the sample gas. The measured density is proportional to the pulse frequency or to the mA output.

    With the digital variant additionally the temperature can be measured over the pulse width of the frequency signal.

   Main features

    Continuous measurement of density and temperature
?  long term drift free output signal
?  Protection IP65
?  No maintenance
?  Compact
?  Vibration and shock proof
?  Suitable for outdoor usage
?  Response time <10ms (with density changes)

   Ordering information

   Specifications
   

   Main characteristics

   Principle:           Oscillating quartz measurement
    Measuring range:     0...60 kg SF6 /m3
                         10 ... 253 Hz
    Output
      Digital:           current pulses onto supply current
      Analogue:          current loop

   Accuracy
    Accuracy:            ±1.8% FS max.
                         ±1.0% FS typ.
    Repeatability:       ±0.2% of measured value
    Temperature signal
      at ambient temperature  ±2°C
      at -40...85°C:         ±3°C

   Electrical data
    Output signal
      Digital:           current pulses
      Density signal:    pulse frequency
                         10...292 Hz (range 0...60 kg SF6/m3)
   Output signal
      Analogue:          6.5...20 mA
      Density signal:    current loop
                         10...275 Hz (range0...56.1 kg SF6/m3)
    Supply voltage
      Digital output:    2-wire, 10...20 VDC
                         3-wire, 14...28 VDC
        Ground: via gas connection of sensor
    Supply voltage
      Analogue output:   2-wire, 10...32 VDC
    Reaction time:       <10 ms (with density changes)
    Temperature signal: Pulse width 2188 ... 2565 ... 2975μs
                        (=Temp. -40...23...85°C) 

   Environmental conditions
    Operating temperature: -40... +70°C
    Media temperature:     -40... +70°C
    Storage temp.:         -40... +85°C
    Operating pressure:    max. 15 bar
    Humidity:              suitable for outdoor usage;
                           55°C and 98% relative
    Protection:            1)IP65
    Vibration:             15 g (max. 6 mm),(5...2000 Hz)
    Shock:                 100g/ 6 ms

    EMC Protection
    ESD:                   8kV/15kV air EN/IEC 61000-4-2
    Radiated Immunity:     10V/m, 80...2700Hz
                           EN/IEC 61000-4-3
    Burst:                 4kV EN/IEC 61000-4-4
    Surge:                 2kV (42 Ω) EN/IEC 61000-4-5
    Conducted Immunity:    10V, EN/IEC 61000-4-6

   Mechanical data
    Material:
      Pressure connection:  1.4435 (AISI316L)
      Tube                  1.4301
      O-Ring:               EPDM
      Male electrical plug: see ordering info.
      Screwed cable gland:  brass nickel plated
    Mounting:               any position
    Weight:                 approx. 200...400 g

   Functional diagram

     Digital 2- or 3 wire                                 Analogue 2-wire

    Output Signal analogue

    Output Signal digital

   without pulses typical 2 mA

    Dimensions

    Adapters

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