Transducers
T1-40 T1-40BF T1-40V
T1-38 T1-38BF T1-38V
Velocity transducers
B A L A N C I N G M A C H I N E S
B A L A N C I N G M A C H I N E S
Principle of operation
A voltage proportional to the velocity of vibration is induced in a coil that moves in a field generated by a permanent magnet.
The coil is suspended seismically on the body of the transducer which is fixed to the measuring point.
Typical applications
The transducer is normally connected to a vibration monitoring unit. This creates a measuring chain able to detect the vibrations
of any rotating machine. The most frequent applications regard motors, pumps, fans, compressors, turboalternators, etc.
considered strategic in any manufacturing cycle. Various models are available according to the different fields of application;
the transducer should be chosen on the basis of the frequency response, direction of measurement, type of material of the
outer case, temperature range or application in a classified area. Each transducer is designed with characteristics to suit the
industrial environment and is provided with a connector to MIL standards or integral teflon cable, with high degree of protection
against atmospheric agents. Installation is very easy and can even be carried out under normal working conditions.
Overall dimensions drawing 1
Overall dimensions drawing 2
Overall dimensions drawing 3
The transducers of this series supply a signal proportional to the velocity of vibration of the point where they are fixed.
T1-40/T1-40BF/T1-40V
VELOCITY TRANSDUCERS T1-40 T1-40BF T1-40V
Type of measurement absolute absolute absolute
Direction of measurement any horizontal vertical
Frequency range 10 ÷ 1000 Hz 3 ÷ 2000Hz 10 ÷2000 Hz
Maximum amplitude ± 1 mm ± 1 mm ± 1 mm
Nominal sensitivity 21.2 mV/mm/s 21.2 mV/mm/s 21.2 mV/mm/s
Resonant frequency 12 Hz 4.5 Hz 10 Hz
Transverse sensitivity < 7% < 3% < 3%
Output impedance ~ 1 K Ω at 25°C ~ 1 K Ω at 25°C ~ 1 K Ω at 25°C
Operating temperature range -40 ÷ +100°C -40 ÷ +100°C
(-40 ÷ +170°C)*
* on request
External connection MS3102A-16S-8S MS3102A-16S-8S MS3102A-16S-8S
-40 ÷ +100°C
(-40 ÷ +170°C)*
* on request
External case anodized aluminium anodized aluminium anodized aluminium
Transducer weight ~ 300 gr ~ 300 gr ~ 300 gr
Mounting Screw M8 screw M8 screw M8 screw
Protection class IP 65 IP 65 IP 65
Overall dimensions according to Dwg. 1 according to Dwg. 2 according to Dwg. 2
T1-40 T1-40BF / T1-38BF
T1-38/T1-38BF/T1-38V
VELOCITY TRANSDUCERS T1-38 T1-38BF T1-38V
Type of measurement absolute absolute absolute
Direction of measurement any horizontal vertical
Frequency range 15 ÷ 2000 Hz 3 ÷ 2000Hz 10 ÷2000 Hz
Maximum amplitude ± 1 mm ± 1 mm ± 1 mm
Nominal sensitivity 100 mV/mm/s 21.2 mV/mm/s 21.2 mV/mm/s
Resonant frequency 15 Hz 4.5 Hz 10 Hz
Transverse sensitivity < 3% < 3% < 3%
Output impedance ~ 3.6 K Ω at 25°C ~ 1 K Ω at 25°C ~ 1 K Ω at 25°C
Operating temperature range -40 ÷ +100°C -40 ÷ +100°C
(-40 ÷ +170°C)*
* on request
External connection
through integral cable
(optional protection of cable
with flexible conduit)
through integral cable
(optional protection of cable
with flexible conduit)
-40 ÷ +100°C
(-40 ÷ +170°C)*
* on request
through integral cable
(optional protection of cable
with flexible conduit)
External case
Transducer weight 300 / 500 gr 300 / 500 gr 300 / 500 gr
Mounting Screw M10 screw M10 screw M10 screw
Protection class IP 66 IP 66 IP 66
Overall dimensions according to Dwg. 3 according to Dwg. 3 according to Dwg. 3
anodized aluminium
stainless steel
anodized aluminium
stainless steel
anodized aluminium
stainless steel
T1-40V / T1-38V T1-38
Ordering data
A / B / C / D / E / F / G
T1 -
A : type of transducer
38 model 38
40 model 40
B : direction of measurement
00 in all directions
BF horizontal
VO vertical
C : temperature range
00 standard
HT 170° C
D : certified version
(only for model T1-40)
0 standard
Certifications according to ATEX 94/9/CE
1
0722 II 1 GD EEx ia IIC T6 IP65 T85°C
0722 II 1 GD EEx ia IIC T5 IP65 T100°C
0722 II 1 GD EEx ia IIC T4 IP65 T135°C
0722 II 2 GD EEx ia IIC T6 IP65 T85°C
0722 II 2 GD EEx ia IIC T5 IP65 T100°C
0722 II 2 GD EEx ia IIC T4 IP65 T135°C
E : housing material
(only for model T1-38)
0 anodized aluminium
1 stainless steel
F : length of integral cable
(only for model T1-38)
0 5 meters
1 10 meters
2 20 meters
3 special to be defined
G : cable protection
(only for model T1-38)
0 without protection
1 with protection
Example of an order:
A / B / C / D / E / F / G
T1 -
3 8 B F 0 0 0 1 0 0
G : without protection
F : with 5 meters of cable
E : of stainless steel
D : not certified
C : standard temperature
B : for measuring in horizontal direction
A : model 38
Technical data
Electrical connection
The connection cable should be shielded, bipolar type with
minimum cross section of 1 mm2, joined to the connector supplied
as standard with the transducer (model T1-40) or else directly fitted
to the transducer (model T1-38).
Mounting
The transducer should be fitted by tapping a hole at the point where
it has to be fixed. If this is not possible, apply a block with tapped
hole on the machine support. The use of adhesive is advisable
when tightening the transducer.
CEMB also manufactures
• Universal horizontal balancing machines with coupling and/or belt
drive for balancing rotors from 10 g to 100.000 Kg.
• Vertical balancing machines for balancing rotors from 50 g to 1500
Kg on 1 or 2 correction planes.
• Special purpose balancing machines for complete assemblies.
• Special purpose balancing machines including various types of
units for correcting unbalances semi-automatically or automatically.
• Portable equipments for measuring and analyzing vibrations as well
as balancing under service conditions.
• Fixed supervisory and testing equipment for continuous monitoring
of large scale plants with rotating machines (turbines, pumps,
compressors) including checking for vibrations, displacements,
deformations, eccentricity, etc.
and offers the following services:
• Balancing on a contract work basis
• Vibration analysis on a contract work basis
• Periodic maintenance data acquisition service
• Training courses in balancing and vibration technology at CEMB
or customer’s premises
• Specific technical booklets on balancing and vibration technology
are available upon request, free of charge:
Booklet N.2 - “Mechanical vibration technology”
Booklet N.3 - “Balancing technology”
Booklet N.8 - “Accuracy in balancing rigid rotors”
Booklet N.10 - “Balancing of flexible rotors”
Booklet N.11 - “Testing of balancing machines”
Booklet N.17 - “Theoretical principle of wheel balancing”
Booklet N.18 - “Wheel balancing”
Booklet N.19 - “Crankshaft balancing”
Booklet N.20 - “Balancing under service conditions”
Booklet N.23 - “Testing of vibrations in machines during service”
Booklet N.24 - “Machinery monitoring and
supervisory instrumentation”
Booklet N.26 - “Protection of balancing machines”
Safety precautions and devices for use
on balancing machines
Booklet N.27 - “Choice of a balancing machine”
B A L A N C I N G M A C H I N E S
CEMB S.p.A.
Via Risorgimento, 9
23826 Mandello del Lario (LC) Italy
www.cemb.com
Vibration analysis division:
phone +39 0341 706111
fax +39 0341 706299
stm@cemb.com
All the data and features mentioned in this catalogue are purely for information and do not
constitute any commitment on the part of our company, which reserves the right to make any and
all alterations it may consider suitable without notice.
AT5001420 06/08
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