VIBRATION SENSORS (DISCONTINUED)

These sensors are used for early detection of changes in vibrations of machinery. Early detection is critical in preventing damage to equipment and the results of costly delays. Vibration sensors can be used on motors, fans, pumps, moderate speed gearboxes, paper machine rolls, compressors and many more applications that use machinery on a daily basis.

Vibration sensors are key within the automotive and power generation industries and can be used in just about every industry process worldwide.

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Class I Division 2 accelerometers

We have six sensors certified for use in Class I Division 2 (Zone 2) hazardous environments typically associated with the oil and gas, mining, steel, chemical processing, pharmaceutical, and petrochemical industries.

Class I Division 2 (Zone 2) general purpose accelerometers:

  • 786A-D2 Standard top exit

  • 787A-D2 Standard side exit

  • 787A-M8-D2 Side exit with M8 mounting stud

  • 780A-D2 Compact for portable data collection

  • 786F-D2 Integral cable

  • 786T-D2 Dual output temperature sensor

                                                       Clas 1 Division Meggit Sensor

All sensors have a sensitivity of 100 mV/g, and a tight ± 5% sensitivity tolerance, and are certified for installation in Class I Division 2, Groups A,B,C,D E, F, G and Class I Zone 2 AEx na IIC T4.

Full performance, compact sensors

780 series

Meggit 3 Sensor

Reliable performance

The 780 series of narrow, low profile, and lightweight sensors are ideal for portable data collection and online monitoring. Compact size allows installation in small areas and easy handling on walk-around routes. Hermetic seal and piezo-stabilitation ensure a long sensor life and minimal signal drift, two of the quality and reliability traits for which Wilcoxon accelerometers are known for.

Sensitivity tolerance options

The series offers a variety of sensitivity tolerance choices. The 780A’s tight tolerance of ±5% is ideal for measurements on critical or failure prone machinery. The wider tolerances of the 780B (±10%) and 780C (±15%) offer an economical choice for vibration trending or walkaround programs in which the exact sensitivity tolerance of the sensor can be programmed into the acquisition system.

Additional features

  • Embedded EMI/RFI shielding
  • Acceleration range up to 80 g
  • ±3 dB frequency range from 0.4 Hz to 14 kHz
  • Exceptional performance-to-cost ratio
  • Reliable performance in extreme environments
  • 780A is available certified for hazardous areas

4-20 mA process control products

Many facilities want to monitor machinery vibration, but don’t want an “expensive” vibration program. 4-20 mA products keep track of vibration levels so that maintenance professionals can take action on machines that start trending upward (higher vibration).

  • sOutput signals fed to a process control computer (PLC/DCS/SCADA) or directly to an alarm module
  • No trained analysts needed
  • ISO 10816 offers guidance on vibration limits for rotating machinery
4 20 Meggitt

Mean time before failure rate

The 786 series offers the longest MTBF rate in the industry providing continuous cost savings and reliable performance for 25 years.

MTBF
Mean time between failures (MTBF) represents the average expected time that will elapse between failures of like units under like conditions. Purchasers should consider MTBF of sensors before buying them. Accelerometers with a low (short) MTBF result in higher costs due to the manpower required for troubleshooting, replacement of faulty accelerometers and lost data associated with the more frequent failures.
MTBF Meggitt

Total hybrid failure rate (λρ)

The Department of Defense developed a calculation to be used for electronic systems and circuits. Military Handbook MIL-HDBK-217 provides guidance for computing the MTBF for hermetically sealed electronic circuits.

The 786A is sealed to a leak rate of 1 x 10-8 cc/sec and is considered to be truly hermetically sealed. An analysis of failures indicates that the hybrid circuit board and connections are the only parts to fail due to normal environmental exposure. The piezoelectric sensing element does not play a significant role in failures.

λρ = [ΣNCλC] (1 + 0.2 πE) πF πQ πL failures per 1,000,000 hours

Where
NC = number of each particular component
λC = failure rate of each particular component
πE = environmental factor
πF = hybrid function factor
πQ = quality (screening) factor
πL = longevity (experience) factor

N is determined from the part or connection count, all other factors are determined through reference to MIL-HDBK-217 for the particular component or element.

Calculated total hybrid failure rate of 786A

Total hybrid failure rate at 60° C
λρ = [0.064775] 70.18
= 4.5459 per 106 hrs
= 219,978 hours MTBF (25 years)

Total hybrid failure rate at 120° C
λρ = [0.230651] 70.18
= 16.187087 per 106 hrs
= 61,778 hours MTBF (7 years)

*1 - These Vibration Sensors are manufactured by Meggitt and sold by Yokogawa Corporation of America. All data is in accordance with manufacturer’s specifications and is subject to change and correction.

Name Description File Type  
MSS Short Form Catalog MSS Short Form Catalog pdf icon
2.01 MB
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12 Things to Know pdf icon
329 KB
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Know the health of your machinery pdf icon
58 KB
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Low Power, Low Voltage pdf icon
635 KB
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Name Description  
Improving Accelerometer Measurement Reliability in Data Acquisition Systems There are several factors for a user to consider when using an IEPE accelerometer, particularly when used with newly available integrated signal conditioner/data acquisition systems. Correctly managing these factors will help the user avoid erroneous data from their IEPE accelerometer and ensure the quality of the measurement data is at the level they expect and require. Learn More
 

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