Vibration Transducer Installation - SPM Machine Guard MG4-REF11A Instruction Manual

SLD121
SLD122
SLD144

Vibration transducer installation

The transducer is mounted on the machine against a smooth, flat surface. M8 and UNF 1/4"-28
are the threads on the transducers. The transducer type TRV is supplied with three washers, each
of which changes the output direction 90°. The coaxial cable must be clamped close to the trans-
ducer. A sealed cable plug should be used for installations in moist environments.
As a rule, an insulation foot, either TRX-18 for M8 or TRX-19 for UNF 1/4"-28, should be used to
provide electric insulation when using transducers of type TRV. The reason is that differences in
earth potential between transducer and MG4-REF11A can cause measuring faults. Note, however,
that the installation foot limits the linear range of the transducer to ≈ 2000 Hz.
Flat-face mill the surface to a depth of max. 0.7 mm. To drill the mounting hole, use drill bit 6.9
mm for M8 and 5.5 mm for UNF 1/4". Torque and unscrew the transducer with a 17 mm torque
wrench. The torque is 10 Nm.
SPM Instrument AB • Box 504 • SE-645 25 Strängnäs • Sweden
Tel +46 152 225 00 • Fax +46 152 15075 • info@spminstrument.se • www.spminstrument.com
Machine Guard MG4-REF11 A
Measuring direction
ø 6.9
(ø 5.5)
TRV-18/19
17
TRV-20/21
ø 27.5
t
ø 15
min. 16
Technical data are subject to change without notice.
ISO 9001:2000 certified © SPM 2017-09. 71947 B
19
Cable
clamp
M8
(UNF
1/4"-28)