Keller Series 33 X and 35 X pressure transmitters

The Keller Series 33 X and 35 X pressure transmitters are mathematically compensated to achieve up to 0.01% FS precision. The highly precise pressure transmitters are available in pressure ranges from 1 to 1000 bar. Both analog and digital outputs are simultaneously available, and the Series 33 X and 35 X are fully programmable.

Based on the Keller ‘floating in oil’ piezoresistive element principle, which extends the measuring element’s tolerance of high overpressures and transient temperature gradients, the Series 33 X and 35 X utilise the newly developed XEMICS microprocessor with integrated 16-bit A/D converter to digitally compensate for temperature discrepancies and non-linearities in the pressure sensor.

The processor converts the analog 4-20 mA or 0-10 V output signal at 400 Hz for transmission via the RS485 interface. There are several ‘transmitter-to-PC’ converters with cables, including the K102 and K107, plus USB versions. Keller PROG 30 software can be used for the programming of each transmitter, to display live pressure, to adjust the zero and offset and gain of the pressure transmitter, to change the bus address (up to 128 Series 30 X transmitters can share the same bus) and to adjust the low-pass filter for each transmitter. READ30 software is also available to graphically display the digital output signals for up to 16 Series 30 X transmitters.