Highly Precise Pressure Transmitters Series 33 X / 35 X
Mathematically Compensated / Programmable
Digital Output of Transmitter:
This high precision of 0,01 %FS is available as an option (the standard Series 33 X has an accuracy of 0,05 %FS). These Series are based on the stable, floating piezoresisitive transducer and the newly developed XEMICS micro-processor with integrated 16 bit A/D converter. Temperature dependencies and non-linearities of the sensor are mathematically compensated.
Transmitter with Analog Output:
Integrated in the XEMICS processor is a D/A converter of 16 bit for analog signal outputs of 4…20 mA or 0…10 V. The output rate is 400 Hz. The accuracy is diminished by this converting process by 0,05 %FS. The digital output is available on all transmitters with analog output.
||0,8...1000 bar (abs./rel.)
4...20 mA (2-wire)
0...10 V (3-wire)
0…2,5 V / 0…5 V (3-wire)
0,1…2,5 V (3-wire)
|Accuracy, Error Band
typ. 0,05 %FS (digital)
typ. 0,1 %FS (2-wire)
typ. 0,1 %FS (3-wire)
(only for Series 33 X and for ranges > 10 bar)
|typ. 0,01 %FS (digital)
|Long Term Stability typ.
||Gauges: 1 mbar or 0,05 %FS
Absolute: 0,5 mbar or 0,025 %FS (10…40°C)
|Pressure measurements can be displayed and recorded on PC or Laptop with help of the software ControlCenterSeries30 (CCS30) and a seriel interface cable. Export of recordings to usual file formats possible. Up to 128 devices can be connected together into a KELLER Bus-system.
|Accuracy and Precision
"Accuracy" is an absolute term, "Precision" a relative term. Dead weight testers are primary standards for pressure, where the pressure is defined by the primary values of mass, length and time. Highest class primary standards in national laboratories indicate the uncertainty of their pressure references with 70 to 90 ppM or close to 0,01%.
Commercial dead weight testers as used in our facilities to calibrate the transmitters and manometers indicate an uncertainty or accuracy of 0,025 %. Below these levels, KELLER use the expression "Precision" as the ability of a pressure transmitter or manometer to be at each pressure point within 0,01 %FS relative to these commercial standards. The transmitter's full-scale output can be set up to match any standard of your choice by correcting the gain with a calibration software.
Series 33/35S has been replaced by Series 33 X / 35 X.
The data sheet of Series 33/35S can still be downloaded under the following link:
Data Sheet Series 33/35 S (obsolete)