Series 9900 Displacer Operated Level Controls with Sealed External Chamber
The 9900 series models feature a displacer chamber that can be opened, enabling the internal elements to be checked and maintenance carried out.
They are designed for external application to very high pressure systems, such as hydraulic accumulators and natural gas compressors, for control of very low-density liquids (down to 0.4 kg/dm³). In the standard model the chamber is in carbon steel, fitted with sealing flanges of dimensions conforming with AMSE CODE, Section VIII, Div. 1, App. 2.
The standard model comes with 1" NPT process connections; 1" SW connections are also available, to which 1", 1½" and 2" flanges can be applied in the configurations and face-to-face dimensions shown below.
The internal elements are in AISI 316 stainless steel, the displacer is in AISI 316L for model 9901, in Karbate for models 9902-3-4, the contrast spring is in "INCONEL" and the attraction sleeve is in AISI 446. All the models in this series can be fitted with a single switch mechanism; the factory settings allow them to work with all liquid density values, with the minimum limit shown in the table below
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