Hydac EDS 3300 electronic pressure switch

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The EDS 3300 electronic pressure switch with a flush membrane has a ceramic measurement cell with a thick film strain gauge for relative pressure measurement in a low pressure range.

The pressure connection is achieved with a fully sealed stainless steel front membrane filled internally with a pressure transfer fluid. The process pressure is transmitted hydrostatically to the measurement cell via the pressure transfer fluid. Depending on the type, the instrument can have up to two switching outputs and a switchable analog output (4–20 mA or 0–10 V).

It has been designed specifically for applications in which a standard pressure connection could become blocked, clogged or frozen by the particular medium used. Further applications include processes where the medium changes frequently and any residues could cause mixing or contamination of the medium.

The EDS 3300 features an accuracy ≤1%FS, and the PNP switching output supports up to 1.2 A load per output. The 4-digit digital display is rotatable in two planes for optimum alignment, and the measured value can be displayed in bar, psi or MPa. Operation is via simple key programming — switching points and switch-back hysteresis can be adjusted independently.