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Operating Manual
MHM-97884
Table 11-16: Accuracy following API 670
Temperature range
0°C to 45°C
1
Measuring range
2
Requires previous Automatic calibration, see
sensors
The deviation from straight line (DSL) error is the maximum error (in mm) in the sensor
gap reading at a given voltage compared to a 2.0 mV per micrometer best fit straight line.
DLS errors are associated with errors in axial position or sensor gap readings.
The incremental scale factor (ISF) error is the maximum amount the scale factor varies
from 2.0 mV per micrometer when measured at specified increments throughout the
linear range. Measurements are taken at 1000 µm increments. The ISF error is associated
with errors in radial vibration readings.
Basis of the data are measurements with:
•
PR 6426 cable at the temperature of the AMS EZ 1000 Converter.
•
First meter of the PR 6426 cable at the temperature of the PR 6426 tip.
•
No ambient temperature change of the AMS EZ 1000 Converter during 1 hour before
the measurement. Power and sensor connected to the AMS EZ 1000 Converter for at
least 10 minutes before measurement and calibration.
•
Emerson reference target material is 42CrMo4 (AISI 4140), unless otherwise stated.
Note
For measurements that require a higher measuring accuracy, factory calibrated measuring
chains are available.
Accuracy of measuring chains different from the standard measuring chain
Add the measurement inaccuracies in
accuracy of measuring chains different from the standard measuring chain. The
incremental scale factor (ISF) error is typically ±5%, this applies to 90% of the measuring
range.
Table 11-17: Additional inaccuracies – DSL
Parameter
Other cable lengths
Extended measuring range: 16.0 mm
(Extended range factor: 2.0)
MHM-97884, Rev. 1.8
Automatic calibration
Multipoint calibration
Automatic calibration
1
Multipoint calibration
DSL
1
± 2.0% of MR
2
1
± 1.5% of MR
Calibration – PR 6424, PR 6425, and PR 6426
Table 11-17
to the values in
Additional Measurement Inaccuracy
(DSL),
Test range
0.0%
± 6.0%
± 2.0%
Technical data
October 2023
ISF
Table 11-16
to get the
119
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