Endevco 6240 (CA303)

1.0 DESCRIPTION

The ENDEVCO® Model 6240M56 (Vibro-Meter 144-303-000-011/111) accelerometer is designed to be sensitive to mechanical vibration of turbine engines and is sturdy enough to withstand adverse operational environments. The transducer has an improved design which provides low sensitivity deviation with temperature while maintaining high operating resistance.

Electrically, the Model 6240M56 signal output is isolated from the case and is taken via an integral shielded, twisted pair hardline cable, with a metallic overbraid, through a 2 pin, MIL 83723, 10 shell connector with key position N.

The following Performance Specifications are taken at 80°F (27°C) referenced at 100 Hz and conform to ISA RP 37.2 (1-64) unless otherwise noted.

2.0 PERFORMANCE CHARACTERISTICS

2.1 CHARGE SENSITIVITY                                             50 pC/g ±5%

2.2 RESONANCE FREQUENCY                                     15 kHz minimum

2.3 CHARGE SENSITIVITY DEVIATION                          ±5%, 2 Hz to 350 kHz

VERSUS FREQUENCY

2.4 CHARGE TEMPERATURE                                        ±10% from 80°F to 900°F (27°C to 482°C)

RESPONSE

2.5 TRANSVERSE SENSITIVITY                                    5% maximum

2.6 AMPLITUDE LINEARITY                                           1% maximum to 100 g peak

2.7 ELECTRICAL

2.7.1 Electrical Phasing Pin 1 is electrically positive

2.7.2 Internal Resistance                                                1000 Mohm minimum

10 Kohm minimum at 900°F (482°C)

2.7.3 Isolation Resistance                                              100 MW minimum

2.7.4 Capacitance                                                         2500 pF maximum

3.0 ENVIRONMENTAL CHARACTERISTICS

3.1 TEMPERATURE

3.1.1 Transducer and Cable

Normal Range                                                               -65°F to 900°F (-54°C to +482°C)

Extreme Range                                                             -65°F to 930°F (-54°C to 499°C)

3.1.2 Connector                                                            -65°F to 500°F (-54°C to +260°C)

3.2 LEAKAGE                                                               The accelerometer, integral cable and connector

                                                                                  shall be sealed such that leak rate shall be less

                                                                                  than 10-4 atm cc/sec.

3.3 VIBRATION                                                            200 g pk sinusoidal

3.4 SHOCK                                                                  1000 g pk in any direction

4.0 PHYSICAL CHARACTERISTICS

4.1 DIMENSIONS                                                          See Outline Drawing

4.2 CASE MATERIAL                                                      Inconel 600

4.3 CABLE

Type                                                                             Single shield, MgO insulated, twisted pair with

                                                                                    metallic overbraid.

5.0 CALIBRATIONS SUPPLIED

5.1 CALIBRATIONS                                                       Per ATP6240M56