Metrix Probe Mounting System - 5497PM

Oil-tight, with Insulating Connection Head

and Gap Adjustment

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Metrix Reverse Probe Mount Disadvantages of ConvenƟonal
Probe Holder Systems
Eddy Current probes are used in rota ng • It is common prac ce to completely readjust
equipment to monitor speed, vibra on, axial the probe gap a er each disassembly.
posi on, or absolute and rela ve expansion.
• The probe is usually connected to a driver
Basically there are two different types: “standard or transmi er via an extension cable.
mount probes” which are screwed directly into Humidity at the contacts as well as ground
the machine housing or bracket, and “reverse fault caused by touching the housing leads
mount probes,” which are installed by means of to measurement errors. Conven onal
a moun ng sleeve. connec on heads are made out of
aluminum or other conduc ve material.
The reverse mount type has several advantages:
• Common connec on heads offer li le
• Since there is only one type of 5497PM, and volume to store the excess length of
only the length varies, the spares management the probe cable. These cables o en get
for reverse mount probes becomes very easy. squeezed and damaged during installa on.

• The reverse mount probes are properly • The crimped connec on between cable and
installed by using the right length of the plug some mes breaks if the tensile load causes
moun ng sleeve. Using the standard mount an incorrect bend radius. Without special tools
probes you would have to consider the the crimp connec on cannot be repaired.
installa on loca on by using a certain probe
length or thread length each me. • Sha vibra on sensors are typically installed
in bearing housings with hot oil inside.
O en mes, the threads are not oil ght.

Conven onal connec on ends with stuffed-in cables.

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Probe MounƟng System - Key Features
Reference Face

1. Easy MounƟng due to a Reference

Face Adapter
Even a thin-walled casing is sufficient for the
installa on of the 3/4” NPT reference face
adapter. Due to the conical NPT thread and the
addi onal sealing with Loc te, the reference face
adapter will be oil ght.
Fixed and sealed with Loc te

2. Once-And-For-All Gap Adjustment Lock Nut

The reverse mount probe is screwed into the the Moun ng Stud
adjus ng sleeve. The adjus ng sleeve is screwed
into the adapter screw. The adapter screw is
screwed into the insert. The flat top of the 3/4” Reference Face
NPT reference face adapter is the reference face. 3/4” NPT Reference
Face Adapter
The gap between probe and sha surface is
Adjus ng Sleeve
adjusted for the first me by turning the adjus ng
sleeve and then fixing its loca on with a lock
nut. At future disassemblies, the adapter screw
is released, thereby, freeing the assembly. This
Bearing Housing
ensures exactly the same gap a er reassembling
Gap

without any need for readjustment.

↓ Reverse Mount
↓ Probe

Rotor

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Probe MounƟng System - Key Features
conƟnued

3. Reliably Oil-Tight
The reverse mount probe which is screwed into the
adjus ng sleeve is sealed with an 0-ring (1 ). Two 0-rings
seal between the adjus ng sleeve and adapter screw (2).
2
Last but not least the adapter screw is sealed axially with an
0-ring against the flat top of the insert (3).
3

Even if there is hot oil mist and even overpressure inside

the bearing housing, the 0-rings provide an oil ght seal.

1
4. ConnecƟon Head with Many Advantages
• Sufficiently dimensioned for safe winding of the cable
without exceeding the minimum allowable bending
radius.
• The connec on head is adjusted so the extension cable
points to the correct direc on. This posi on then is
fixed with a lock nut. Connec on between
• The connec on head is made of non-conduc ve probe cable and
extension cable
material. Even if the connec on touches the wall of the (shown without
housing there is no ground fault. protec ve cover).

• A standard conduit is fixed by a screwed cable fi ng.

5. Rugged ProtecƟve Sleeve for Disassembled Probe

From experience, probes are o en damaged a er disassembling the probe holder due to inappropriate
handling. The Metrix Probe Moun ng System comes with a rugged protec ve sleeve cover to safeguard the
probe and the moun ng stud.

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The Probe MounƟng System
Screw Cap

The Metrix Probe Moun ng System is superior Thread M16x1.5

to conven onal probe holder systems.

ConnecƟon Head
• Due to the reference face on a special insert
A/F 32
the gap between probe and sha has to be
Lock nut for ConnecƟon Head, M16x1, A/F 24
adjusted only once.
Lock nut for AdjusƟng Sleeve, M16x1, A/F24
• Due to three 0-ring seals the system is oil
ght. Probe Holder Base, A/F 36

• A big volume connec on head protects

against damaging the cable by inappropriate O-ring (radial sealing)

handling. MounƟng Stud G3/4”

AdjusƟng Sleeve with (2) O-rings inside
Probe Holder Base
• A non-conduc ve material for the
M16x1 for Screw-on Cap
connec on head protects reliably against
ground fault. Eddy-current probe (not included)

• Disassembled probes are protected by a

rugged sleeve cover.

Note: With the Metrix Sta c Calibrator and

Dynamic Signal Generator, one can check the
en re measurement loop. See Proximity Probe
Accessories on the Metrix website.

Contact us for more informa on:

OpƟonal
Reference Face Adapter
Metrix Instrument Co. A/F 36
MounƟng Stud 3/4” NPT
8824 Fallbrook Dr.
Houston, TX 77064
Tel: (1) 281.940.1802
sales@metrixvibra on.com ProtecƟve Screw-on Cap
www.metrixvibra on.com

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