Highly Precise (0,01%) Pressure Transmitters Series 33 X / 35 X Digital Output of Transmitter

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New Website	Level	Pressure	Data Acquisition	Temperature & Humidity	Load & Torque
Flow	Instrument Hire	Displacement	Radio Telemetry & Modems	Control & Display	Condition Monitoring
Gyros, Accelerometers & IMU'S		Gas Detectors	Test & Calibration	Air Flow & Environmental	Chart Recorders
AC/DC Current & Voltage Sensors		Stock clearance & special offers	Terms & Conditions	news / new products	links

Highly Precise (0,01%) Pressure Transmitters Series 33 X / 35 X 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. With the READ30 software and the KELLER cable K-107, the calculated pressure can be displayed on a Palmtop, Laptop or PC. The READ 30 software also allows the recording of pressure signals and the graphic display on the PC. Up to 128 transmitters can be hooked together to a Bus-system. 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. Programming With the KELLER software READ 30 and PROG30, a RS485 converter (i.e. K102 or K107 from KELLER) and a PC, the pressure can be displayed, the units changed, a new gain or zero set. The analog output can be set to any range within the compensated range.

Series 33 X Male Pressure Port G1/4"	Series 35 X Pressure Port G1/2'', Flush Diaphragm

Pressure Ranges	0,8...1000 bar (abs./rel.)
Output Signal	RS485 (digital) 4...20 mA (2-wire) 0...10 V (3-wire)
Accuracy, Error Band (10…40 °C)	typ. 0,05 %FS (digital) typ. 0,15 %FS (2-wire) typ. 0,1 %FS (3-wire)
Optional: Precision *	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)
Resolution	0,002 %FS

Only for Series 33 X and for ranges higher than 10 bar.

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 indicate an uncertainty or accuracy of 0,025 %. Below these levels, KELLER use the expression “Precision” as the ability of a pressure transmitter 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 the PROG30 software.

Data Sheet
Series 33 X /35 X

New Website	Level	Pressure	Data Acquisition	Temperature & Humidity	Load & Torque
Flow	Instrument Hire	Displacement	Radio Telemetry & Modems	Control & Display	Condition Monitoring
Gyros, Accelerometers & IMU'S		Gas Detectors	Test & Calibration	Air Flow & Environmental	Chart Recorders
AC/DC Current & Voltage Sensors		Stock clearance & special offers	Terms & Conditions	news / new products	links