The 'Optima' series liquid level transmitter uses the established measurement principle of pressure sensitive diaphragm and LVDT. Our unparalleled experience in the use of this technology over many thousands of applications results in a level transmitter capable of performing accurately and reliably in the most demanding and arduous liquid duties. Diaphragms are provided in a choice of corrosion resistant alloys and are offered in a number of "nominal" ranges, each engineered for optimum performance on it's measurement span. Diaphragm travel is limited by mechanical design, providing unmatched tolerance to high overload and shock conditions. Production employs TIG fusion technology and Mass Spectrometry analysis to ensure complete integrity of all welded joints. A process of thermal 'ageing' is used for stress relief and to ensure long-term stability in service. Submersible construction is standard and the sensor may be free standing , suspended, clamped or pole mounting within the vessel. For external mounting, any standard flange or thread may be specified.

Where the application demands, automatic compensation for both process and ambient temperature fluctuations can be built in. For enhanced reliability and stability, all active electronics are remotely sited in a weatherproof enclosure, which, for ease of adjustment, contains all calibration controls. This electronics module meets current IEC standards for RFI/EMC immunity, and is available certified I.S. for use in hazardous zones. Sensor cables are available with a choice of outer sheathing including a high performance PTFE for high temperature (to 150^oC) and aggressive chemical duties.