CEMB USA T-NC_16-S - Manual (Page 4)

4
TRANSDUCER POSITIONING
Refer to drawing Nr. 17281
1) Drill holes on the machinery for the sensor support and for any cable protection
devices (sheaths, ducts etc.).
2) Drill a hole to fasten the converter box at a distance from the machinery shorter
than that of the connecting cable (5m).
3) Separate the sensor from the converter by disconnecting the cable from the terminal
board inside the converter (carefully note the polarity of the two leads making up
the cable), then mount the sensor on the support prepared in point 1
4) After checking that the machinery lies in position K (ZERO position with the machine
stationary), perform a preliminary mechanical adjustment of the GAP by acting on
the nut-lock nut device of the sensor. The GAP indicated in the application drawing
refers to the mid point of the measuring range.
5) Fasten the converter box via the holes drilled in point 2, attach protective sheaths
if required, reconnect the sensor cable on the converter terminal board making sure
of the exact polarity of the two leads making up the cable.
6) Proceed to the electrical connection of the converter to the measuring instrument
as indicated in dwg. 17281.
POSITIONING FOR AXIAL POSITION
7A) With the machine in position K and with the
measuring instrument operating, use
the nut-lock nut device of the sensor to search for the exact coincidence between
the mechanical gap and the electrical calibration of the converter in one or,
better, both of the following
way:
- reading on a voltmeter connected across pins A and D of the converter connector
(or else across the terminals corresponding to the transducer signal input on
the terminal board of the instrument) on the scale 0 to 10 Vdc of the range of
measurement (0Vdc= scale start, 10Vdc=full scale) of the volts corresponding
to the Gap; as the Gap indicated in the application drawing of the transducers
refers to the mid point of the range of measurement, under this condition there
should be a corresponding reading of 5 Vdc.
Hence the sensor position should be adjusted through small displacements along its
longitudinal axis until the value of 5 Vdc on the voltmeter.
POSITIONING FOR ECCENTRICITY
7B) With the machine in position K and with the
measuring instrument operating, use
the nut-lock nut device of the sensor to search for the exact coincidence between
the mechanical gap and the electrical calibration of the converter in the following
way:
- reading on a voltmeter connected across pins A and D of the converter connector
(or else across the terminals corresponding to the transducer signal input on
the terminal board of the instrument) on the scale 0 to 10 Vdc of the range of
measurement (0Vdc= scale start, 10Vdc=full scale) of the volts corresponding
to the Gap; as the Gap indicated in the application drawing of the transducers
refers to the mid point of the range of measurement, under this condition there
should be a corresponding reading of 5 Vdc.
Hence the sensor position should be adjusted through small displacements along its
longitudinal axis until the value of 5 Vdc on the voltmeter.
8) Then lock the sensor in position using the nut-lock nut device.
9) Close the converter making sure that it is spray- and dust-proof.
REMARKS REGARDING CORRECT POSITIONING OF TRANSDUCERS T-NC/S
1) Never, under any circumstances, modify the sensor / converter cable length: this
would cause a measuring error.
2) The end part of the sensor must lie at a distance from metal materials different
from the one involved in measuring the distance: at least twice the max. amplitude
of measurement (see application drawing).
3) When mounting the sensor, a reference cone should be prepared at 90° vertex from
the sensor tip. No metallic material must be introduced in the cone apart from the
surface to be measured.
UTS051020
ASTD54120