KROHNE OPTIBAR PC 5060 C EN - Manual (Page 58)

7
TECHNICAL DATA
58
OPTIBAR PC 5060 C
www.krohne.com 04/2014 - 4003437201 - MA OPTIBAR PC 5060 C R01 en
Technical data
7.1 Measuring principle
The OPTIBAR PC 5060 C sensor element is the CERTEC ® measuring cell with robust ceramic
diaphragm. The measuring cell is made up of a ceramic base body welded to the equally ceramic
diaphragm via a glass solder connection. The base body and the diaphragm are inside the
measuring cell, partially coated with gold and passivated against environmental impacts with an
extremely thin glass layer. Pressure acting on the measuring cell diaphragm causes a change in
capacitance in the measuring cell. This change is evaluated by the sensor electronics and
converted into a corresponding output signal by the converter electronics. A temperature sensor
behind the diaphragm allows for the additional output of a temperature measurement.
The ceramic measuring cell is available in two designs:
• Diameter 17.5 mm / 0.69" for small process connections and the measuring range
100 bar / 1450 psi.
• Diameter of 28 mm / 1.1" for large process connections and all flange connections.
The measuring cells are configured differently depending on the type of pressure selected:
Gauge pressure: Gauge pressure: Gauge pressure: Gauge pressure: The measuring cell is open to the atmosphere. The ambient pressure is
compensated directly in the measuring cell and thus has no influence on the measurement.
Absolute pressure: Absolute pressure: Absolute pressure: Absolute pressure: The measuring cell is evacuated and enclosed. The process pressure is
measured in reference to vacuum. Any change in the ambient temperature changes the
measured value.
Figure 7-1: Ceramic measuring cell
1 Diaphragm
2 Glass solder connection
3 Base body
.book Page 58 Friday, May 2, 2014 12:49 PM