Vacuum Sensors with Digital Display

The pressure sensors of the PN series are characterised by a modern and user-friendly design. The maximum robustness, high protection rating and captive laser labelling ensure reliable operation of the sensors even in in harsh industrial environments. The ceramic-capacitive measuring principle with a special support of the measuring diaphragm makes the sensors immune to overload operation and high pressure peaks, ensuring outstanding long-term stability.
Set-up, maintenance and operation are facilitated by a 4-digit LED display, which is visible from all sides even at greater distances, and two switching status LEDs on the sensor head. The display can be switched from the indication of “red” to an alternating indication of “red – green”. So, switching states can be highlighted or an independent colour window can be created.
The screwed-on sensor can be rotated in any direction. Mounting brackets, which can be obtained as an option, allow installation in any position.

Clearly indicate the acceptable ranges: programmable red/green display
The process connection can be rotated for optimum alignment
Intuitive, user-friendly handling
Clearly visible indication of the switching status
Permanently legible laser type label

Description

The PN family incorporates the best combination of over pressure, burst pressure and long-term stability for each measuring range. At 1450 psi and below, the PN sensors use the ceramic capacitive technology. Above this range, the thin film metal strain gauge technology is used.

Ceramic capacitive

The most important element of the ceramic capacitive technology is the ceramic (Al₂O₃) measuring cell. After assembly, the ceramic cell element resembles a plate capacitor with a reference electrode and a measuring electrode placed 15 µm apart. The capacitance is inversely proportional to the distance between the electrodes. As pressure is applied, the distance changes by a small value and the capacitance changes proportionately. This signal is then converted into pressure by a microprocessor.

Robust, direct sensing measurement technology
Eliminates possibility of contamination from diaphragm fill fluid
Long-term stability of ceramic cell design does not fatigue like stainless steel
Internal support construction creates very high pressure ratings
Ceramic cell is more resistant to abrasion, dents or dings that can create measurement offsets
Highest overload pressure rating, especially with dynamic pressure peaks