Description
The 3300 XL 25 mm Transducer System consists of a separate 25 mm probe, an
extension cable, and a 3300 XL 25 mm Proximitor
Sensor. The 0.787 V/mm (20
mV/mil) output gives this system a linear range of 12.7 mm (500 mils). Based on
this linear range, the 3300 XL 25 mm Transducer System is suitable for
measuring differential expansion (DE) on mid-size to large steam turbine
generators caused by the difference in growth rates between the turbine rotor
and the machine stator (casing).
Measuring Differential Expansion(DE)
The Differential Expansion measurement is made by two proximity transducers
observing a collar or ramp some distance from the thrust bearing. Typical
transducer mounting arrangements are:
• Two transducers observing the same side of a collar.
• Two complementary input transducers observing opposite sides of a

collar, effectively doubling the measurable DE range.

Ordering Information
3300 XL 25 mm Proximity Probe:
330851-AXX-BXXX-CXXX-DXX-EXX-FXX
A: Probe Case Type Option
Note: Standard case types are 01
through 04.
0 1 1¼ -12 Thread
0 2 M30x2 Thread
0 3 Smooth 1.06 in dia - Rear Exit
0 4 Smooth 1.06 in dia - Side Exit
0 5 1½ -12 Thread
0 6 M39x1.5 Thread
0 7 Smooth 1.5 in. dia - Rear Exit
0 8 Smooth 1.5 in. dia - Side Exit
B: Unthreaded Length Option
Note: Standard unthreaded length is 0.0
mm or 0.0 in. There is an additional
charge for non-standard unthreaded
lengths.
Unthreaded length must be at least 26
mm or 1.0 inch less than the case length.
Unthreaded length option is 0.0 in. for
smooth case probe types.
Metric Case
Types:
Order in increments of 2 mm.
Maximum
unthreaded
length:
224 mm
Minimum
unthreaded
length:
0 mm
Example:
0 5 0 = 50 mm
English Case
Types:
Order in increments of 0.1 in.
Maximum
unthreaded
length:
8.9 in.
Minimum
unthreaded
length:
0.0 in.
Example:
0 2 5 = 2.5 in.
C: Overall Case Length Option
Note: Standard case lengths are 26, 40,
60, 80, 100 and 250 mm for metric cases
and 1.0, 2.0, 3.0, 4.0 and 9.9 in. for English
cases. There is an additional charge for
non-standard case lengths.
Metric Case
Types:
Order in increments of 2 mm
Maximum case
length:
250 mm
Minimum case
length:
26 mm
Example:
0 5 0 = 50 mm
English and
Smooth Case
Types:
Order in increments of 0.1 in
Maximum case
length:
9.9 in
Minimum case
length:
1.0 in (1.5 in for side exit case
types)
Example:
0 2 0 = 2.0 in
D: Total Length Option
1 0 1.0 metre (3.3 feet)
5 0 5.0 metres (16.4 feet)
9 0 9.0 metres (29.5 feet)
Note: Five metre probes are designed for
use with the five metre Proximitor Sensor
only.
E: Armor Option
0 0 No Armor
0 1 with SST Armor
Note: When ordering SST Armor, the
minimum probe length is 28 mm or 1.1
inch.
F: Agency Approval Option
0 0 No Approvals
0 5 Multiple Approvals
Note: For a shorter delivery time, order
commonly stocked multi-approvals
probes. Currently, stocked probes consist
of the following part numbers:
330851-01-000-020-10-00-05
330851-01-000-030-10-00-05
330851-02-000-040-10-00-05
330851-02-000-080-10-00-05
330851-04-000-015-10-00-05
330851-04-000-020-10-00-05

3300 XL 25 mm Proximitor Sensor
330850-AXX-BXX
A: Total Length and Mounting Option
5 0 5.0 metres (16.4 feet) system
length, panel mount
5 1 5.0 metres (16.4 feet) system
length, DIN mount
9 0 9.0 metres (29.5 feet) system
length, panel mount
9 1 9.0 metres (29.5 feet) system
length, DIN mount
B: Agency Approval Option
0 0 No Approvals
0 5 Multiple Approvals
3300 XL 25 mm Extension Cable
330854-AXXX-BXX-CXX
Note: Make sure that the extension cable
length and the probe length, when added
together, equal the Proximitor Sensor total
length.
A: Cable Length Option
0 4 0 4.0 metres (13.1 feet)
0 8 0 8.0 metres (26.2 feet)
B: Armor and Cable Option
2 4 High Temperature FluidLoc
cable
2 5 Armored High Temperature
FluidLoc cable
C: Agency Approval Option
0 0 No Approvals
0 5 Multiple Approvals