Piezoresistive OEM Pressure Transducers Series 3 L to 10 L - 4 Pages

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Piezoresistive OEM Pressure Transducers Series 3 L to 10 L

Catalog excerpts

Piezoresistive OEM Pressure Transducers    Series 3 L to 10 Llaser welded diaphragm - compatible with corrosive media Series 3 L...10 L are a new generation of transducers from KELLER which feature smaller capsule dimensions and a crevice-free diaphragms. KELLER's expertise in laser welding very thin materials enables the production of a line of transducers with a crevice-free media interface while improving on performance and long-term stability. Each transducer undergoes extensive automated testing and is supplied with calibration data which includes sensitivity, linearity, initial zero offset and thermal effects over the compensated temperature range. This provides the user with the information required to ensure performance within specifications. The 3 L.. .10 L transducers feature floating O-ring mounting to avoid errors which can be caused by mechanical stresses imparted to the transducer housing and ensures performance within the specifications. The transducer housing encases the piezoresistive silicon pressure sensor and a small quantity of oil, the latter of which is required to efficiently transfer the pressure exerted on the media-isolation diaphragm to the silicon pressure sensor. The type of oil is most typically silicone but other oils are available for special applications where silicones are not allowed. With the laser welded technology, transducers having diameters as low as 9,5 mm can be realised. As can be discerned from the below chart, the lower the pressure ranges are available in only the larger, i.e., 0 19 mm diameter, due to the inherent increase in diaphragm stiffness as the diameter is reduced. Also note from the chart the lengths of the “L” vs. “L HP” designs, e.g., Series 6 L and 6 L HP, wherein the 6 L HP is 3,5 mm longer than the 6 L in order to accommodate the thicker glass feedthrough required to contain the higher pressures. Dimensions    Ranges Type    (mm)    (bar)    Version KELLER Ges. fur Druckmesstechnik DE-79798 Jestetten +49 7745 9214 0 E eurocenter@keller-druck.com Edition 11/2018 Subject to alterations Companies approved to ISO 9001 fa* www.keller-druck.com

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Specifications    Excitation I = 1 mA Series 3 L...10 L    Standard Pressure Ranges (FS) in bar PD, neg. Overpressure [-] PD- 9 L, max. Line Pressure PD-10 L, max. Line Pressure PR: Vented Gauge. Zero at atmospheric pressure PAA: Absolute. Zero at vacuum PA: Sealed Gauge. Zero at atmospheric pressure (at calibration day) PD: Differential * ± 40% Bridge Resistance @ 25 °C Constant Current Supply Insulation @ 500 VDC Compensated Range (1) Storage- / Operating Temperature Vibration (20 to 5000 Hz) Endurance @ 25 °C Housing and Diaphragm O-Ring Material Oil Filling Dead Volume Change @ 25...

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Standardised Premium-Line The preceding two pages present a variety of possibilities for the design, pressure ranges, accuracies, materials and manufacturing processes for the Series 3 I____10 L. The benefits of standardised processes are only of limited use when custom-manufacturing this unique, piezoresistive OEM pressure sensor. For this reason, variants have been selected from the existing L-Series and refined by our engineers to create a “Standardised Premium-Line”, starting with Series 10 L. Creating this standard has brought signficant advantages. For instance, processes have been...

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Performance Long Term Stability Accuracy (1) Influence Line Pressure Electrical Characteristics Constant Current Supply Bridge Resistance @ 25 °C Insulation @ 500 VDC Material Housing and diaphragm Seal Ring Oil Filling Stainless steel, type 316 L Ø 15,6 x 1,78 mm Operation below -20 °C (on request) Silicone oil AK100 Temperature Characteristics Compensated Range Storage- / Operating Temperature Temperature Coefficient - Zero (R1/R2 pre-compensated) TCzero - Sensitivity TCsens (2) - Total Bridge Resistance Dynamics Vibration (20 bis 5000 Hz) Natural Frequency (Resonance) Endurance @ 25 °C...

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