Magnetrol Offers Switches for Natural Gas Filters

The Thermatel TD1/TD2 switches from Magnetrol can be used for high-level alarms in natural gas filters. The switches, which are based on thermal dispersion technology, can be easily adjusted to detect flow (in gases and liquids), level or liquid-liquid interface. With continuous diagnostics, automatic temperature compensation, narrow hysteresis and a fast response time, the Thermatel TD1/TD2 switches are said to ensure excellent performance and reliability.

Gas compressor stations are mainly installed near extraction fields or underground storage facilities. A filter system is used to clean the extracted natural gas that will be brought into the compressor units. The Thermatel TD1/TD2 switches can be used for high-level alarms in these natural gas filters. On each filter, a two-level sensor (warning high level and alarm high level) is needed. For this application, two TD1 switches can be utilised. The TD1 switch can operate under heavy conditions - typically for such a filter system, high static pressure (~150 bar) and a rather specific medium (natural gas condensate in combination with sand and other waste).

However, the TD1 switch can operate from -70C up to +450C and can handle pressures of up to 410 bar. The TD1 uses a constant power to the sensor, meaning calibration can be performed easily and quickly. The built-in temperature compensation reduces the effect of sudden process temperature changes to a minimum and thus offers the benefit of a fast response and repeatable operation. The switch also has a local error indication via a blinking light-emitting diode (LED). The TD2 switch has all the features of the TD1 switch but can also send an mA error signal to the control room.

This is said to be beneficial in critical service applications where the user needs to be assured the switch is operational. Another feature of the mA output is the possibility for trending and diagnostics, providing a repeatable trend indication of the flow rate.

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