Description

Keller Series 33X Features

• Insulated and encapsulated piezoresistive pressure sensor
• High-quality pressure transducers and tried-and-tested mathematical compensation
• RS485 Interface can be combined with analog output
• Analog output is rangeable by RS485 Interface and CCS30 Software
• Modbus RTU Protocol available on RS485 Interface
• Excellent Long-term Stability, zero point adjustment via CCS30 software
• Maximum accuracy/precision down to 0.01%FS

Electrical Information

Available Electrical Connections

M12	2-Wire	3-Wire		Binder 723	2-Wire	3-Wire
M12 x 1	4-20mA	0-10V		M16 x 0.75	4-20mA	0-10V
	1: Out/GND	1: GND			1: Out/GND	1: GND
	2: n.c.	2: Output			2: n.c.	2: Output
	3: 8-32vDC	3: 13-32vDC			3: 8-32vDC	3: 13-32vDC
	4: RS485A	4: RS485A			4: RS485A	4: RS485A
	5: RS485B	5: RS485B			5: RS485B	5: RS485B

Cable Gland	2-Wire	3-Wire		DIN Connector	2-Wire	3-Wire
5.8mm Diameter Cable	4-20mA	0-10V		DIN 43650	4-20mA	0-10V
	White: Out/GND	White: GND
	Red: n.c.	Red: Output			1: Out/GND	1: GND
	Black: 8-32vDC	Black: 13-32vDC			2: n.c.	2: Output
	Blue: RS485A	Blue: RS485A			3: 8-32vDC	3: 13-32vDC
	Yellow: RS485B	Yellow: RS485B			Case	Case

Available Pressure Connections

¼″ BSP Diaphragm	¼″ NPT Diaphragm	½″ BSP Diaphragm	½″ NPT Diaphragm

Increased Precision / Accuracy (optional)

Higher precision of 0.01%FS, or 0.025%FS, is available as an option (Compared to the standard Series 33X accuracy of 0.05 %FS). These Series are based on the stable, floating piezoresistive 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.

	Standard Accuracy ±0.05%FS, with KELLER calibration certificate ex works. Keller uses pressure sources to calibrate its products that are at least four times more accurate than the product to be tested. This enables us to produce products in our factory with an absolute accuracy of up to ±0.05%FS.
	Precision ±0.01%FS /±0.025%FS, with KELLER calibration certificate ex works Additional measurement work and selection of a specific pressure transducer means that optimum repeatability is guaranteed for the selected pressure transmitters. Owing to the residual measurement uncertainty of the pressure sources used at its factory, KELLER cannot provide any verification of measurement accuracy at scales below ±0.05%FS for these ultra-precise devices. KELLER therefore uses the term “precision” to denote the ability of a pressure transmitter to repeat measured values within a tolerance of up to 0.01%FS based on the pressure sources used at the factory.
	Accuracy ±0.01%FS / ≤±0.025%FS with DakkS (German accreditation body) certificate, issued by an external accredited calibration laboratoryBy calibrating the zero point and performing amplification via the digital interface, an accredited calibration laboratory (ilac.org) can adapt ultra-precise KELLER products to their more accurate pressure sources and record the results. External calibration to an accuracy of up to ±0.01%FS is performed in accordance with the guidelines set out by the German Calibration Service (DKD) and is conducted under reference conditions without any consideration of long-term effects.

Improved accuracy is only possible for Series 33X sensors with a PA or PAA pressure reference, ranges 10 Bar or above and the 2-Wire 4-20mA outputs are also excluded.

For units with any other options, intermediate pressure or temperature ranges, please contact us directly for pricing.