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Rockwell Automation Publication 1443-TD001D-EN-P - March 2019
1443 Series Accelerometers Specifications
API-670 Compliance
All 1443 Series sensors are compliant to the American Petroleum Institute (API) Standard 670, 5th Edition, November
2014, with the following exceptions:
• Side exit sensors have an outside diameter greater than 25 mm (1 in.) as specified by API-670 paragraph 5.2.1.5.
• Calibration frequency is 80 Hz, in accordance with ISO standard 9001-2008, rather than 100 Hz as specified in
API-670 Table 1 note f.
• Only the standard 16 ft cables are nominally 5 m (200 in.) as specified by API-670 paragraph 5.2.2.2.
• Cables do not ship with loose heat-shrink tubing for labeling, as specified by API-670 paragraph 5.2.2.3.
Perhaps the most important attribute of the sensor, per the standard, is its accuracy. The standard specifies accuracy
requirements for accelerometers in the following table.
The 1443 Series sensor is ± 5% across the entire operating range of the sensor. This sensor range significantly exceeds the
requirement of only testing within the temperature range. Among sensors advertised as API compliant, this provides a
much more consistent and accurate measurement than most sensors compared to the requirement of just ±20%.
Table 1 - Machinery Protection System Accuracy Requirements
Accelerometers and Accelerometer Extension Cables
(1)
(1) During the testing of the accelerometers, the parameter under test is the only parameter that is varied. All other parameters remain constant.
Temperature
Accuracy Requirements as a Function of Temperature
Test Range
Operating / Storage Range
Within Testing Range
Outside Testing Range but Within Operating Range
20...30 °C
(68...86 °F)
–55...+120 °C
(–65...+250 °F)
Principal axis sensitivity
: 100 mV/g ± 5%
Amplitude linearity: 1% from 0.1...50 g peak
(2)
Frequency response
(3)
: ±3 dB from 10 Hz to 10 kHz,
referenced to the actual measured principal axis
sensitivity
(4)
(2) Conditions of test at any one temperature within the testing range, at any single frequency that is not specified but is within the specified frequency range of the transducer.
(3) Frequency response testing conditions, at any one temperature within the testing range, at an excitation amplitude that is not specified but is within the specified amplitude range of the transducer.
(4) Principal axis sensitivity testing conditions (test range), at any one temperature within the testing range set at 100 Hz, at an excitation amplitude that is not specified but is within the specified
amplitude range of the transducer. Operating range at any one temperature within the operating range, at 100 Hz, at an excitation amplitude that is not specified but is within the specified amplitude
range of the transducer.
Principal axis sensitivity
: 100 mV/g ± 20%
IMPORTANT
Sensors manufactured earlier than October 2017 can have sensitivity variances of up to ± 10% across the operating range.