Endevco® model 6237M70 and 6237M71 piezoelectric accelerometers to +650°C

Product catalog summary

Overview: The Endevco® models 6237M70 and 6237M71 are piezoelectric accelerometers designed for high-temperature environments, such as aircraft and gas turbines. They operate continuously at temperatures up to +1200°F (+650°C) and are known for their long Mean Time Between Failure (MTBF). Their compact size and lightweight design allow for installation in tight spaces with minimal support.

Design and Features: These accelerometers use Endevco’s Piezite® type P-15 crystal in a shear design. The 6237M70 model has its sensitive axis aligned with the mounting screw, while the 6237M71 model's axis is perpendicular to the mounting screw. Both models feature an integral hardline cable, typically 120 inches long, with other lengths available upon request. They are self-generating and require no external power source.

Specifications: The accelerometers conform to ISA-RP-37.2 (1964) standards. Key specifications include a charge sensitivity of 10 pC/g, a frequency response up to 5000 Hz, and a resonance frequency of 11 kHz. They maintain performance across a wide temperature range, with specific deviations noted at +600°F, +1000°F, and +1200°F. The devices are ground isolated and feature a single bolt mount.

Electrical and Environmental Characteristics: The accelerometers have a resistance of ≥10 kΩ at +1200°F and are isolated at ≥500 kΩ. They are designed to withstand sinusoidal vibrations up to 500 g and shock limits up to 2000 g. The temperature range for the transducer and cable is -67°F to +1200°F, with the connector rated up to +500°F.

Physical Characteristics: The accelerometers are made from Inconel, weigh 1.1 oz (30 gm), and include a triaxial hardline cable with an Inconel jacket. The connector is a coaxial receptacle designed to mate with Endevco 3000 series cable assemblies.

Calibration and Maintenance: Calibration data is provided, and Endevco offers factory calibration services to maintain precision and accuracy. The company reserves the right to modify specifications without notice to ensure product reliability.

Accessories: The product includes a mounting screw and optional accessories like a cable assembly and charge amplifier.

Catalog excerpts

Endevco® model 6237M70 and 6237M71 piezoelectric accelerometers to +650°C-1

Endevco Model 6237 M70/M71 Piezoelectric accelerometer Features Description +1200°F [+650°C] opթration Intթgral hardline cable Single bolt mount Օ Ground isolated Gas turbine testing The Endevco® model 6237M70 and 6237M71 piezoelectric accelerometers are designed specifically for use in extremely high temperature environments such as aircraft and ground-based gas turbines. These accelerometers are designed for continuous operation at +1200°F (+650°C) with long Mean Time Between Failure (MTBF). The small size and light weight of these accelerometers permit installation in cramped locations with minimal structural support. The accelerometer is a self-generating device that requires no external power source for operation. Models 6237M70/M71 incorporate Endevco's Piezite® type P-15 crystal in a shear design. The 6237M70 and 6237M71 differ in their internal design and in the direction of the sensitive axis. The 6237M70 has its sensitive axis located in line with the mounting screw, while the 6237M71 is oriented perpendicular, or transverse, to the mounting screw. The sensing elements and integral shield are isolated from the case. These accelerometers feature an integral hardline cable with a standard length of 120 inches (3.05 meters). Other cable lengths are also available on special order Sensitive axis Endevco signal conditioner model 2721B is recommended for use with this high impedance accelerometer. TYPICAL AMPLITUDE RESPONSE 20 o lu q l -- ՗ - - - __ 15 10 FREQUENCY IN HERTZ TYPICAL TEMPERATURE RESPONSE O 20 -10 -30 -100 (-73) (149) (371) TEMPERATURE oF (oC) 1100 (593) MEGGiTT smart engineering for extrתme environments

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Endevco® model 6237M70 and 6237M71 piezoelectric accelerometers to +650°C-2

Model 6237 M70/M71 Piezoelectric accelerometer Endevco Spcifications The fohowing performance spcifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75°F (+24°C), 100 Hz and 10 Vdc unLess otherwise noted, CaLibration data, traceabLe to National Institute of Standards and Technology (NIST), is suppLied, Dynamic characteristics Charge sensitivity, ±5% Frequency response [1] Resonance frequency Amplitude response [2] ±5% ±1 dB Temperature response [3] +600°F (+315°C) max/min +1000°F (+537°C) max/min +1200°F (+650°C) max/min Transverse sensitivity Amplitude linearity per...

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Endevco® model 6237M70 and 6237M71 piezoelectric accelerometers to +650°C-3

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