KELLER SPA , Digital Pressure Transmitters

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Series 30 X: Fast, digitally compensated pressure transmitters with analog output. The sensor signal is measured up to 500 times per second with a highly precise A/D converter (16bit). After each measurement, the exact pressure value is calculated (elimination of the linearity- and temperature errors).

The analog output signal is updated via the D/A converter. This technology allows highly precise and fast pressure measurements, even over high temperature ranges.

Analog Output: The scalable analog output offers the standard analog interfaces:

• Voltage output (0…10 V)

• Current output 2-wire technology (4…20 mA). The outputs are protected against reverse polarity and short-circuit.

Digital Interface: In addition to the analog signal output, these pressure transmitters offer a digital, bus-capable interface, offering the following possibilities:

• Read-out of the pressure- and temperature values.

• Customer-side calibration of zero and gain.

• Scaling of the analog output to other pressure ranges or -units.

•Configuration settings

• Read-out of information, such as serial number, compensated pressure- and temperature ranges…

• Two wire RS485 half-duplex with 9’600 baud or 115’200 baud.

Digital Compensation Technology: Non-linearity and temperature dependencies of the pressure sensor can be eliminated to a large extent with a mathematical model of the sensor. In production, each pressure transmitter is measured over the entire temperature-and pressure range. These measuring values are the basis for the mathematical model.

Series 30 X

This compensation technology reduces the error band to typically 0, 05 %FS over the entire pressure- and temperature range, which is an improvement of factor 20 to 50 (see graphics below). Each transmitter is supplied with a calibration certificate, indicating the data measured at least 3 temperature- and 4 pressure points.

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