CEMB S.p.A. - 23826 MANDELLO DEL LARIO (LC) I - Via Risorgimento 9
Tel. (+39)0341/706.111 - Telefax (+39)0341/735.678
www.cemb.com e-mail: cemb@cemb.com
T5-LVDT/100-24 TRANSDUCER
FUNCTION
The transducer T5-LVDT/100/24 is used for performing the measurement of Absolute
Displacement, the measurement is made by means of a position transducer system based on
a linear variable differential transformer (LVDT) by mounting the transducer body on a
fixed point and positioned so that the sensor tip of transducer T5-LVDT/100 presses
permanently against one end of the movable part of the machine casing.
The as picked-up signal is sent to the adapter part AD1-BOX (signal converter situated
downstream of the transducer), which makes it suitable for processing by one CEMB T5
unit.
PRINCIPLE OF OPERATION
A rod in close contact with the movable part to be checked is strictly integral with a
magnetic core moving within a fixed coil inside the transducer sensor body. The coil
has one primary winding and two secondary windings connected in opposing phase; the
output signal (secondary winding) is proportional to the mechanical displacement of the
core and should, therefore, be sent to an adapter module (AD1) which makes it suitable
for subsequent processing by CEMB instruments, of the “T” series.
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TECHNICAL CHARACTERISTICS
Range of measurement : 0 to 100 mm
Composition : Sensor T5-LVDT/100
Sensitivity : 0,1 V/mm
Transformer LVDT : . Impedance, primary winding = 535 ohm/2500 Hz
. Impedance, secondary windings = 875 ohm/2500 Hz
. Max linearity error = ± 1.0% f.s.
. Nominal sensitivity = 18 mV/0.001”/V
. Frequency range = 50 Hz to 10 kHz
. Supply voltage = 3 V rms (rated)
Range of application : . Temperature = -55°C to +95°C
. Humidity = max 95% not condensing
. Vibrations = max 20 g / 2 KHz
. Ambient = IP55 EN 60529/10.91 standards
Maintenance : none
Power supply : . Transducer = +15 Vdc, GND
Connection : . Transducer = connector 7-pin MIL C-5015
series 3106/16, standard kit
. Adapter = connector 5-pin MIL C-5015
series 3106/16, standard kit
Outer casing material : Aluminium
Weight : Kg 20 approx.
Drawings enclosed : 51351 = Overall dimensions, mounting, connections
Adapter AD1-BOX
Adapter = +15 to +24 Vdc, GND
N.B.
The sensor part carries a removable cover at the top. After removing this cover, it is
possible to read the mechanical value of turbine casing expansion on a graduated scale.
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TRANSDUCER POSITIONING
Refer to drawing Nr. 51351.
FOREWORD
The sensor part carries a removable cover at the top. After removing this cover, it is
possible to read the mechanical value of the displacement on a graduated scale.
The transducer tip is fitted with a protective cap to protect against damage during
transport. Hence such cap should be removed during assembly.
The tip is held firmly in contact with the movable part of an internal spring device
which also provides a preloading stroke of 5.0 mm of the tip.
OPERATIONS TO BE PERFORMED
Remove the protective cap from the tip and separate the sensor part from the adapter
part AD1.
1) Remove the protective cap from the mechanical pointer of the sensor.
1) Make sure that the movable part to be tested (turbine casing) is in zero or known
displacement position.
2) Drill the mounting holes for the two parts making up the transducer: for the sensor
part, bear in mind the preloading stroke, then provisionally fasten the sensor
checking that the mechanical pointer gives the zero position (or known position) of
the displacement with exact preloading.
3) Electrically connect the sensor part to the adapter part, then the latter to the T
instrument using the connectors supplied as standard and following the manual
operating instructions.
4) With the transducer connected and energized, and by means of a voltmeter connected
across pins A and D of the adapter connector (or else across the terminals
corresponding to the input of the measuring instrument transducer signal), search
for the exact coincidence between the mechanical measurement checked and prepared
in points 3 and 4 and the electrical reading corresponding to the displacement,
bearing in mind that a displacement of 0 mm corresponds to 0.0 Vdc, a displacement
of 50.0 mm corresponds to 5.0 Vdc, while 100.0 mm corresponds to 10.0 Vdc.
Make some small displacements of the sensor part until the electrical reading
corresponds to the actual readng on the graduated scale.
5) Then lock the two parts making up the transducer into position and proceed to pin
the sensor.
7) For all these operations the utmost care is recommended in order not to damage the
internal mechanisms; above all, avoid sudden releases and knocks on the movable rod
of the tip.
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ASTD26120
UTS051102
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