The measuring device is used to measure the level of liquid FM-200® in 106, 147, 180, and 343 litre containers. The weight of the FM-200® in the container is determined by converting the level measurement into a weight measurement using the weight conversion tables in appendix D of this manual. The operating temperature range for the liquid level measuring device is 0 to 54 °C (32 to 130 °F).
  The liquid level is found by lifting the measuring tape from inside the tube to the end (or approximately 75 mm (3”) above the anticipated liquid level) and slowly lowering the tape until a magnetic interlock with the float is felt. The tape will then remain in the up position, allowing a reading at the top of the housing. This measurement is accomplished without removing the tank from the fire suppression system.
  The device must be installed in an empty container assembly before filling, the liquid level measuring device must be ordered as a separate line item.