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2.1.5 Measurement parameter units
Table 2-3 shows the measurement parameters and available units that can be configured
for each parameter.
Measurement parameter unitsTable 2-3:
Parameter Units
Velocity (Overall 1, Overall 2)
mm/s RMS
in/s RMS
PeakVue maximum value (PeakVue 1, PeakVue 2)
m/s
2
g’s
Temperature (Temperature 1, Ambient)
°C
°F
Sensor Bias (Bias 1, Bias 2) V
Supply Voltage V
2.1.6 Alert levels
The CSI 9420 sets HART status bits to indicate when measured values exceed the
configured thresholds. Each measured value has three levels: Advisory, Maintenance, and
Failed that can be set independently. These thresholds are pre-configured at the factory to
reasonable generic values for single-stage, electric motor-driven equipment trains
operating at 1200–3600 RPM.
The level at which these thresholds should be set depends on the type of equipment being
monitored and on your specific process.
One rule of thumb for vibration is to examine the current level at which the equipment is
operating. Assuming the equipment is in good working condition, set the Advisory level at
2x the current value (or at a minimum of 0.05 in/s RMS, whichever is greater), set the
Maintenance level at 4x the current value, and set the Failed level at 8x the current value.
For example, if the current value for Overall Velocity is 0.1 in/s, set the Advisory threshold
at 0.2 in/s, the Maintenance threshold at 0.4 in/s and the Failed threshold at 0.8 in/s. While
this type of vibration program is not recommended, it can provide a starting point when
no other information is available.
Default alert thresholds for vibrationTable 2-4:
Alert limits
Advise Maintenance Failed
Default value
Report
notification
Default value
Report
notification
Default value
Report
notification
Overall velocity
(sensor 1, 2)
0.14 in/sec
3.556 mm/s
Yes
0.35 in/sec
8.89 mm/s
Yes
1 in/sec
25.4 mm/s
Yes
PeakVue
(sensor 1, 2)
6 g's
58.8399 m/s
2
Yes
10 g's
98.0665 m/s
2
Yes
15 g's
147.09975 m/s
2
Yes
Configuration
14 MHM-97408, Rev 15