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Technical data
October 2023
The deviation from straight line (DSL) error is the maximum error (in mils) in the sensor
gap reading at a given voltage compared to a 7.87 mV (8.0 mV) per micrometer best fit
straight line. DSL 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 7.87 mV (8.0 mV) per micrometer when measured at specified increments
throughout the linear range. Measurements are taken at 250 µm increments. The ISF error
is associated with errors in radial vibration readings.
Basis of the data are measurements with:
•
AMS EZ 1000 Converter and EZ190x at the temperature of the AMS EZ 1000 Converter.
•
First meter of the EZ108x cable at the temperature of the EZ108x 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.
Calibration methods Offline (Easy) and Automatic – typical values
The values of
method Offline (Easy) or Automatic.
Typical accuracy of non-API 670 conform measuring chains
Add the measurement inaccuracies in
accuracy of non-API 670 conform measuring chains
error is typically ±7%, this applies to 90% of the measuring range.
Table 11-6: Additional inaccuracies – DSL
Parameter
Cable length: 15 m
Cable length: 30 m
6
The typical accuracy is defined by a statistical evaluation of the deviation from the nominal value. 95.4% (±2 Sigma) of the deviations of all
measured measuring chains are within the range of the stated typical deviation.
112
Table 11-5
are typical values for measuring chains, calibrated with calibration
Additional
Measurement
Inaccuracy (DSL),
Test range
Table 11-6
to the values in
6
. The incremental scale factor (ISF)
Additional
Measurement
Inaccuracy (DSL),
Operating range
±3.5%
±5.0%
-1% to +7%
±5.0%
-5% to +6%
Operating Manual
MHM-97884
Table 11-5
to get the
Remarks
at +23°C
at -35°C to +85°C
(operating range
converter)
at -35°C to +180°C
(operating range EZ108x)
at +23°C
at -35°C to +85°C
(operating range
converter)
MHM-97884, Rev. 1.8
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