Meteorology

Meteorological Station

Context

In the context of the construction of LNG terminal, a meteorological station should be installed in order to monitor weather conditions.

Book of specifications

Requested measures:

  • Wind speed and direction.
  • Barometric pressure.
  • Air temperature.
  • Visibility.
  • Relative humidity.

Conditions:

  • Real time data.
  • Temperature range -22°C to +38°C.
  • Relative humidity range 20% to 90%.
  • ATEX zones (ATmosphères EXplosibles).
  • Fibre optic between weather cabinet and central control room.

Technical solution

Station was installed out of the ATEX zone in order to reduce the costs of the sensors.

System is composed of:

  • Ultrasonic wind sensor at top of 10 meters mast.
  • Pressure sensor (3 heads).
  • Combined humidity and temperature probe.
  • Visibility sensor.
  • Cabinet with data logger and signal converter (for fibre optic).

Electrical power is provided by factory.

Equipment overview

Result

Measured data:

  • Wind speed and direction (1 Hz).
  • Air temperature (ambient, wet air, dew point and wind chill).
  • Relative humidity.
  • Barometric pressure.

Display of monitoring software MOMIS

For data safety the raw data are stored into the electronic cabinet.

The monitoring can be easily performed on a single display, the software permits to archive and to visualize the measures.

Alarm triggering warning flag and audio alert can be set up when defined threshold are exceed. Thresholds of a same measure are distinct for each display