ENDRESS+HAUSER  FMX21-AA111CGB20A

The Waterpilot FMX21 is a pressure sensor for hydrostatic level measurement.

Endress+Hauser offers three different versions of the device:

• FMX21 with a stainless steel housing, external diameter of 22 mm (0.87 in): This version is excellently suited to drinking water applications and for use in bore holes and wells with small diameters
• FMX21 with a stainless steel housing, external diameter of 42 mm (1.65 in): Heavy-duty version and easy to clean thanks to flush-mounted process isolating diaphragm, ideally suited to wastewater and wastewater treatment plants
• FMX21 with plastic insulation, external diameter of 29 mm (1.14 in): Robust version for use in salt water and excellently suited to applications on ships (e.g. ballast water tanks)

• High resistance to overload
• High-precision, robust ceramic measuring cell with long-term stability
• Climate proofed sensor thanks to completely potted electronics and 2-filter pressure compensation system
• Simultaneous measurement of level and temperature with optionally integrated Pt100 temperature sensor
• Accuracy
  • Standard reference accuracy ±0.2 %
  • PLATINUM version ±0.1 %
• Automatic density compensation to increase accuracy
• Usage in drinking water: KTW, NSF, ACS
• Approvals: ATEX, FM, CSA
• Marine approvals: GL, ABS, BV, DNV
• Extensive range of accessories provides complete measuring point solutions

The ceramic measuring cell is a dry measuring cell i.e. the pressure acts directly on the robust, ceramic process isolating diaphragm of the Waterpilot FMX21. Changes in air pressure are guided via a pressure compensation tube through the extension cable to the rear of the ceramic process isolating diaphragm and are compensated for. A pressure-dependent change in capacitance, caused by the movement of the process isolating diaphragm, is measured at the electrodes of the ceramic carrier. The electronics unit then converts this to a signal that is proportional to the pressure and linear to the level.