DPT145

DPT145 Multiparameter Transmitter for SF6 Gas

The Vaisala Multiparameter Transmitter DPT145 for SF6 Gas is aunique innovation that enables online measurement of dew point,pressure, and temperature. It also calculates four other values,including SF6 density. The DPT145 is especially well suited forintegration into OEM systems.

  • First transmitter to offer online measurement of seven SF6parameters in one unit
  • Measured parameters: dew point, pressure, temperature
  • Calculated parameters: SF6 density, normalized pressure, dewpoint in atmospheric pressure, ppm
  • Saves time and money across the board, from investment andinstallation to operation and servicing
  • More reliable assessment of the condition of SF6 insulation dueto online measurement
  • Long calibration interval of years
  • Digital output RS-485 with MODBUS

 

Measured Parameters

Dewpoint -50 ... +30 °C (-58 ... +86 °F)

Pressure, absolute 1 ... 12 bar (14.5 ... 174 psi)

Temperature -40 ... +80 °C (-40 ... +176 °F)

Calculated Parameters

Pressure, normalized to 20 °C (68 °F)                       1 ... 12 bar (14.5...174 psi)

SF6 or SF6/N2 mixture density                                 0 ... 100 kg/m3

ppm moisture, by volume                                        40 ... 40 000 ppm

Dewpoint, converted to atmospheric pressure          -65 ... +30 °C (-85 ... +86 °F)

Performance

Dewpoint accuracy ±3 °C (±5.4 °F)

Dewpoint stability typical drift < 2 °C (3.6 °F) /5 years

Pressure accuracy at 23 °C (73.4 °F) ±0.4 %FS

Pressure temperature dependence ±0.01 bar/10 °C (18 °F)

Pressure stability typical drift < 1 %FS /5 years

Temperature accuracy 0 ... 40 °C (+32 ... +104 °F)                   ±0.5 °C (± 0.9 °F)

                              -40...80 °C (-40 ... +176 °F)                      ±1 °C (± 1.8 °F)

Density accuracy (pure SF6, 1 ... 12 bara)

                                0 ... 40 °C (+32 ... +104 °F)                    ±1 %FS

                             -40 ... +60 °C (-40 ... +140 °F)                  ±2.2 %FS

PPM accuracy, typical (5...1000 ppm, 7 bar)                              ±(7 ppm + 15% of reading)

Sensor response time: Pressure response time                           < 1 s

Dewpoint response time* 63% [90%] at 20°C and 1 bar

-50 -> -10 °C Tdf                                                                    5 s [ 10 s]

-10 -> -50 °C Tdf                                                                  10 s [ 2.5 min]

* system equilibrium related response time is typically longer ​​ ​​ ​​ ​​​​ ​ ​​​​ ​ ​​​​

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