GH14P

The AVL GH14P is a piezoelectric cylinder pressure sensor for combustion analysis on internal combustion engines. AVL designed it mainly for diesel engines: fitted into a glow-plug adaptor it sits almost flush with the combustion chamber, so the signal is free of the pipe oscillations a recessed passage would add. AVL makes the adaptor dimensions to suit each engine.

The sensor measures 0 to 250 bar (300 bar overload) with a nominal sensitivity of 15 pC/bar and a natural frequency of 115 kHz, and works from -40 to 400 C. It uses AVL's gallium orthophosphate (GaPO4) crystal and the Double-Shell design, which keeps mounting stresses away from the measuring elements. An M3 x 0.35 cable connector keeps the tool clearance small, and a built-in sensor ID (SID) lets AVL's Sensor Data Management (SDM) pick up the calibration data automatically.

As a charge-output sensor it needs a charge amplifier or an indicating system such as AVL's own. Typical uses are thermodynamic analysis (indicated mean effective pressure, heat release) and longer-running engine tests. This listing is the sensor with AVL's CI31-2 piezo input cable; AVL's GH14P data sheet (2020) names the accessories, from cables and couplings to adaptors and mounting tools.