Keller OEM Sensors, Transducers Series 3L - 10L Piezoresistive OEM Pressure tansducers (with laser welded media-isolated diaphragm)

Series 3L...10L, a new range of transducers that beneit from smaller capsule dimensions and crevice free diaphragms. KELLER has developed a new technique for laser welding very thin stainless steel media isolation diaphragms. The smaller crevice free transducers still retain all the traditional performance, stability, and quality, for which KELLER is renowned.
3 L / 4 L / 5 L 6 L 7 L Each transducer is supplied with a calibration sheet indicating sensitivity, linearity, zero offset,
temperature errors and the compensation resistors to substantially reduce zero offset and zero temperature errors.
8 L The transducers are designed for loating O-ring seal mounting, this avoids housing induced stress, and guarantees the performance over pressure and temperature as tested in our automatic test chambers. Each transducer comprises of a piezoresistive silicon chip mounted on a PD-9 L glass-metal feed-through header welded into a stainless steel housing and illed with silicone oil, the very thin laser welded stainless steel isolation diaphragm completes the front side. Media pressure is transferred from the stainless steel isolation diaphragm, via the oil inside the cell, to the silicon measuring chip. With the laser welded technology, transducers having diameters as low as 9,5 mm can be realised. Diameter is to some extent dependent upon the pressure range measured, low pressures 10 L require larger diameters, higher pressures can be achieved with smaller diameters. This is due to the expansion of the oil under temperature that creates an internal pressure due to the re-
sistance of the diaphragm. The smaller the diameter, the higher the internal pressure and the more dificult is the zero compensation. The list below shows the dimensions of the standard types of the Series L transducers and the pressure ranges, in which they meet the speciications on the reverse of this lealet. PD-10 L The higher length for high pressure transducers is given by the required thickness of the glass feedthrough to withstand the pressures.

     Dimensions   Ranges
  Typ  (mm)  (bar)  Version
  3 L   9,5 x 4,2  20...200  abs.
  4 L   11 x 4,2  10...200  abs.
  5 L   12 x 4,5  10...200  abs.
  6 L   13 x 4,5  50...200  abs.
  6 L HP   13 x 8  200...1200  abs.
  7 L   15 x 5  10...200  abs. / gauge (<50 bar)
  7 L HP   15 x 8  200...1000  abs.
  8 L  17 x 7  0,2...200  abs. / gauge (<50 bar)
  9 L   19 x 5  0,2...200  abs. / gauge (<50 bar)
  PD-9 L   19 x 15  0,1...50  diff. / wet wet
  10 L   19 x 15  0,1...100  abs. / gauge
  10 L HP   19 x 15  200...1000  abs.
  PD-10 L   19 x 26  0,1...50  diff. / wet wet

 

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