Section 2 - SYSTEM OVERVIEW
5
capacitance of the
accelerometer plus the distributed cable capacitance should not
exceed 8300 picofarads. Cable drawings and schematics are in the appendix.
2.3 Accelerometer
For aeroderivative gas turbines, the accelerometers are typically provided with
the engine either by the manufacturer or the packager and must be qualified by
the engine manufacturer. Accelerometers of this type are typically constructed
with a piezoelectric crystal isolated from the accelerometer case so that the
accelerometer output is differential. Accelerometers used with the 86517
interface module must have a sensitivity of 50 picocoulombes per g or 100
picocoulombes per g, and the necessary connector.
Bently Nevada offers a 50 pC/g charge coupled accelerometer (part number
45357-01) that can be used with this system. This accelerometer has a typical
pole-to-pole capacitance of 1000 picofarads.