Keller Swiss-Built Series 21R/21SR/21MR Piezoresistive transmitters for industrial applications. absolute and gauge references

This new range of KELLER OEM pressure transmitters offers the user the high accuracy and stability of the KELLER piezoresistive pressure capsule in a low cost OEM package. Applications include refridgeration, hydraulic controls, air compressors, ink jet printers, vacuum pumps etc.
The Series 21 R is offered with soldered brass transducers (Series 21 MR), soldered steel transducers (Series 21 SR) or fully welded (Series 21 R), all providing a highly stable measuring cell with negligible hysteresis, unrivalled linearity, high output and a life of millions of pressure cycles.
The transmitters are supplied with 2 metres of screened cable, or a square connector and mating plug, type mPm-193.
Accuracy is achieved by very large scale predictable production quantities of the pressure  capsule (over 2 million produced today).
Reliability is assured by the inherent properties of the perfectly elastic silicon chip, and ensuring that neither the pressure media nor the reference media (in the gauge version) come into contact with any sensitive parts.
Temperature Compensation: Each unit is fully tested and compensated. Span errors are re duced by selecting the semiconductor doping levels so that the gauge factor of the strain gauges (R) is constant with temperature. Thermal zero compensation is achieved by an automatic test procedure which its a single resistor across one arm of the bridge. Shock and vibration performance is excellent due to the silicon chip being suspended in the oil-illed capsule. It is isolated mechanically from the body. Similarly, the effects of mounting torque are eliminated.

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