PEMEX-LC

Pressure meter
- Measuring principle

All Kirchgaesser pressure meters have a silicon thinfilm sensor or a highly resistant ceramic sensor, depending on customer requirements.

The ceramic sensor is a dry sensor, which means the process pressure acts directly on the robust, ultra-pure ceramic membrane (99.99% AL2O3) and moves the membrane. A pressure-dependent capacity change is measured on the electrodes at the ceramic substrate and process membranes. The measuring range is determined by the thickness of the ceramic process membrane. As a dry measuring cell that does not require oils to transfer the pressure, the ceramic sensor is completely resistant to vacuums.
Benefits:
- Guaranteed overload resistance up to 40 times the stated pressure
- Thanks to ultra-pure 99.99% ceramic:
  - extremely high chemical resistance, comparable with alloys
  - reduced relaxation
  - high mechanical stability
  - compatible with vacuums
- Low measuring ranges possible (> 40 mbar)
- High long-term stability

The process pressure moves the process membrane and a filling liquid transfers the pressure onto a resistance measurement bridge (semi-conductor technology). The pressure-dependent change in the bridge-output voltage is measured and evaluated.
Benefits:
- Can be used for process pressures up to 600 bar
- High long-term stability, guaranteed overload resistance up to four times the stated pressure
- Significantly lower thermal influence in comparison with diaphragm seal systems
- Small flush-mounted process connections