Keller Swiss-Built Series 21MC/21SC Piezoresistive pressure transmitters for industrial applications / compact version

These piezoresistive silicon pressure transmitters are produced on the new KELLER automatic brazing lines, making possible the mass production of high quality pressure transmitters at low cost.This new technology allows the crevice-free construction of the pressure port without using seals or O-rings. In the brass sensor line (Series 21 MC), a steel insert and a nickel
diaphragm is brazed into a brass housing. In the steel sensor line (Series 21 SC), all parts are of stainless steel (AISI 316 L). The header with the silicon pressure sensor and glass lead through pins is welded to the steel insert underneath the oil filling. The tiny chip-on-board amplifier (weight  1 gram) with the KELLER-specific !°PROGRES!± circuit is mounted direct
on the glass feed-through pins. It is then encapsulated in silicone compound for humidity and vibration protection.
Note: The cable version of the transmitters has exceptionally high RFI protection.
SPECIFICATIONS
Pressure Ranges (FS)
PA
Sealed Gauge (zero at 1 bar abs.) 5102050100200bar
Series 21 MC
Overpressure102040100200300bar
Brass Sensor Head, Steel Body
3-Wire 4-Wire
2-Wire
Excitation8!-28 V4,75!-5,25 V5!-1
ERIES 21 SC SERIES 21 MC
S
Total Accuracy at RT!à0,5% FS!à1%
T.C. of Zero!à0,03% FS / !aC !à0,04% FS /
T.C. of Sensitivity!à0,03% / !aC!à0,04% /
Long Term Stability, typ.< 0,2% FS< 0,5% FS
Operating Temperature-25!-+80 !
Compensated Temperature Range0!-+50 !
ProtectionIP 65
Vibration20 g (5...2000 Hz, max. amplitude !à3 mm),
according to IEC 68-2-6
Shock20 g (11 ms)
CE-ConformityEN 50081-1,   EN 50082-2
Insulation> 100 M / 500 V
-seal
Pressure PortG 1/4!± male, Eolasti
Cable / Connector2 m / mPm (option DIN 43650)
Series 21 SC
Weight (Connector Version) 60 g
Steel Sensor Head, Steel Body

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