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Description
The 3300/20 Dual Thrust Position Monitor provides early warning of
thrust bearing failure. It continuously measures and monitors two
independent channels of shaft axial position relative to the axial
clearances within the machine. Ideally, the axial probes are
installed to observe the thrust collar
directly, so the measurement represents the position of the collar
relative to the thrust bearing clearance.
Caution
Because thrust measurements are made by observing the gap voltage
of the proximity probe used as an input, a transducer failure (gap
out of range) can be interpreted by the monitor as thrust position
movement and result in a false thrust alarm. For this reason,
Bently Nevada LLC. does not recommend the use of a single probe for
thrust position applications. Instead, these applications should
use two proximity probes observing the same collar or shaft and
configure the monitor as AND voting whereby both transducers must
simultaneously reach or exceed their alarm setpoints for the
monitor’s alarm
relays to actuate. This 2-out-of-2 voting scheme (also known as AND
voting) provides optimum protection against both false trips and
missed trips. While the 3300/20 monitor can be programmed for
either single voting (OR) or dual voting (AND), dual voting is
strongly recommended for all thrust position applications.
Caution
Probe adjustment and range is critical in this monitor for
machinery protection. Improper adjustment of the transducer may
prevent the monitor from alarming (no machinery protection). For
proper adjustment, follow instructions in the manual.
Ordering Information
Dual Thrust Position Monitor
3300/20-AXX-BXX-CXX-DXX-EXX
Option Descriptions
A: Full-scale Range Option
0 1 25-0-25 mils
0 2 30-0-30 mils
0 3 40-0-40 mils
0 5 50-0-50 mils
0 6 75-0-75 mils
1 1 0.5-0-0.5 mm
1 2 1.0-0-1.0 mm
1 3 2.0-0-2.0 mm
B: Transducer Input Option
0 1 3300 or 7200 Proximitor® systems, 200 mV/mil (Ranges 01, 02,
03, 11, and 12 only.)
0 2 7200 11 mm (not 3300XL)
Proximitor system, 100 mV/mil
0 3 7200 14 mm or 3300 HTPS
Proximitor systems, 100mV/mil
0 4 3000 Proximitor® 200 mV/mil
(Transducer Output Voltage in power supply must be set for – 18 Vdc
or use power conver-ter. Ranges 01 and 11 only.)
0 5 3300XL NSv and 3300 RAM Proximitor Sensor, 200 mV/mil (Ranges
01 and 11 only).
C: Alarm Relay Option
0 0 No Relays
0 1 Epoxy-sealed
0 2 Hermetically-sealed
0 3 Quad Relay (Epoxy-sealed only)
0 4 Spare Monitor-No SIM/SIRM
D: Agency Approval Option
0 0 Not required
0 1 CSA/NRTL/C
0 2 ATEX self certification
E: Safety Barrier Option
0 0 None
0 1 External
0 2 Internal
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