With the introduction of the Series 33X and 35X pressure transmitters, Keller AG has raised the bar in high precision pressure measurement technology. The combination of a floating measurement cell, digital signal compensation algorithms and a highly dynamic microprocessor function together to produce reference accuracies of up to 0,05% full scale (FS) error bandwidth.
The floating piezo-resistive sensor element is free of outside influence from mechanical and thermal forces at the pressure connection, and its output is digitised with 16 bit (0,0002% FS) resolution by the A/D converter in the signal processing module. Utilising the signals from the pressure and integrated temperature sensors allows accurate compensated measurements to be made in milliseconds.
Measurement ranges from 0,8 to 1000 bar can be supplied for absolute, gauge, and differential pressures; with high overpressure measurements possible depending on the structural design. (The pressure port can be a threaded connection 33X or a front-flush diaphragm 35X.) In the typical process temperature range of –10 to +80°C the 33X and 35X pressure transmitters supply digital measured values with a total error band of 0,1% FS.
Depending on the plug type and the number of contacts available, the transmitters provide a digital output (RS485) as well as analogue current and voltage outputs. The analogue signal span and zero point are adjustable across the entire measurement range with application specific customisation of parameters being accomplished through the RS485 interface. Free software allows users to configure set-ups for recording and displaying data from up to 16 transmitters.
Series 33X typically offers pressure port connections of G1/4 male or G1/2 male thread, and Series 35X is the flush front diaphragm type. Electrical connection is via a choice of three interchangeable plug types, if protection class IP68 is required a version with a cable connection is also available.
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