Pressure transmitter cuts error rates
A
Keller UK product story
Edited by the Engineeringtalk editorial team
Jun 6, 2007
Keller's series 33X pressure transmitter removes repeatable errors attributable to nonlinearity and thermal effects.
The series 33X pressure transmitter is a digitally compensated instrument.
The internal pressure sensor is mapped over its calibrated pressure and temperature range.
This information is processed by an on-board microcontroller during the transmitter's operation to virtually remove all repeatable errors attributable to nonlinearity and thermal effects.
For applications requiring very high measurement accuracy, Keller's series 33X affords exceptional price / performance benefits.
The sensors are available at a price point similar to traditional, high-linearity analogue transmitters without active temperature compensation.
To this end, the 33X has been deployed in a variety of customised OEM packages into numerous applications.
These include sub-sea positioning systems, engine tests beds, industrial inkjet printers, water dosing and lab barometry.
These digital pressure transmitters are based on the stable, floating Keller piezoresistive transducer and the newly developed Xemics Micro processors.
The sensor signal is measured up to 500 times per second with a highly precise A/D convertor (16bit).
After each measurement, the exact pressure value is calculated.
The analogue output signal is updated via the D/A convertor.
This technology allows highly precise and fast pressure measurements over wide temperature ranges.
The scalable analogue output offers the standard analogue interfaces: Voltage output (0.10V); current output two-wire technology (4.20mA); and a 400Hz output rate.
The outputs are protected against reverse polarity and short-circuit.
In addition to the analogue signal output, these pressure transmitters offer a digital, bus-capable interface.
This allows read-out of the pressure and temperature values; customer-side calibration of zero and gain; and scaling of the analogue output to other pressure ranges or units.
Nonlinearities 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.
With The Read30 software and one of the Keller's convertors, the calculated pressure can be displayed on any PC.
It also allows the recording of pressure signals and their graphic display.
Up to 128 transmitters can be hooked together to a bus system.
Each transmitter is supplied with a calibration card indicating the data measured at three temperature and four pressure points.
More detailed, traceable calibration certificates are available on request.
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