PCB Piezotronics EX611A20, Installation And Operating Manual

Page: 7 / 40

MANUAL: 55308
REV: A
ECO: 49582 2
TABLE OF CONTENTS
OPERATING GUIDE ........................................................................................................................................................... 1
PIEZOELECTRIC CHARGE MODE ACCELEROMETERS ............................................................................................. 1
1.1 Cables in Explosive Atmospheres ........................................................................................................................... 3
1.2 High Temperature Differential Charge Output Sensor............................................................................................ 3
2 CABLING ..................................................................................................................................................................... 3
2.1 General Precautions and Considerations ................................................................................................................. 3
2.1.1 Proper Cable Type and Care .......................................................................................................................... 3
2.2 Softline Cable .......................................................................................................................................................... 3
2.3 Integraral Hardline Cable ........................................................................................................................................ 4
2.4 Hardline Connection Type ...................................................................................................................................... 4
2.4.1 PCB / Lemo type connector ........................................................................................................................... 4
2.4.2 High Temperature 2 –pin 7/16-27 UNS connector ........................................................................................ 4
2.5 In Line Differential Charge Amplifier .................................................................................................................... 4
3 INSTALLATION OVERVIEW .................................................................................................................................... 4
3.1 Equipment Inspection .............................................................................................................................................. 4
3.2 Polarity Test ............................................................................................................................................................ 4
3.3 Sensor Location ....................................................................................................................................................... 4
3.4 Mounting Sensor ..................................................................................................................................................... 5
3.5 Route Mineral Insulated Hardline Cable ................................................................................................................. 6
3.5.1 Care................................................................................................................................................................ 6
3.5.2 Bend Radius ................................................................................................................................................... 7
3.5.3 Clamp Cable .................................................................................................................................................. 7
4 POWERING .................................................................................................................................................................. 8
4.1 Installation ............................................................................................................................................................... 8
4.2 Operation ................................................................................................................................................................. 8
5 HIGH-TEMPERATURE OPERATION ...................................................................................................................... 8
5.1 Introduction ............................................................................................................................................................. 8
5.2 Reduced Resistance at Charge Amplifier Input ...................................................................................................... 9
5.3 Solution to Reduced Resistance .............................................................................................................................. 9
5.4 Low-Frequency Response Limitations .................................................................................................................. 10
5.5 Other Precautions .................................................................................................................................................. 10
6 ACCELEROMETER CALIBRATION ....................................................................................................................... 11
6.1.1 SENSOR RECALIBRATION ..................................................................................................................... 11
6.1.2 BACK-TO-BACK CALIBRATION THEORY .......................................................................................... 11
6.1.3 PCB CALIBRATION PROCEDURE ......................................................................................................... 13