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Vibration equipment division

 11

TR-NC/8 - R

ev

.02/2013

5. 

I

nstallation

• 

Prepare the machine to fit the fastening devices (holes, brackets, supports, etc.) of each sensor, then install the sensor 
separating it from the relative transmitter.

• 

Prepare the cable protection devices (sheaths, ducts) on the machine.

• 

Position the junction boxes housing the transducers at a distance from the machine that takes into account the total 
length of the extension cable connection.

  R

emembeR

 

that

 

the

 

length

 

of

 

the

 

connection

 

between

 

the

 

sensoR

 

and

 

the

 

tRansmitteR

 

should

 

not

 

be

 

changed

as

  

 

this

 

would

 

Result

 

in

 

changes

 

in

 

instRument

 

lineaRity

 

and

 

calibRation

.

With the machine stationary, make a first adjustment of the mechanical gap to approximately 1.5 mm.

•  F

or sensors installed outside the bearing, this adjustment can be made using a thickness gauge

• 

For sensors installed inside the bearing support, it is advisable to measure the total depth of the hole using a gauge and 
screw in the sensor so that the mechanical gap is approximately 1.5 mm

• 

Recommended probe case torque 10 N x m. For the first 10 threads, maximum torque 3 N x m.

Summary of Contents for TR-NC/8

Page 1: ...n equipment division www cemb com CEMB S p A Via Risorgimento 9 23826 MANDELLO del LARIO Lc Italy TR NC 8 No contact Transmitter Use and maintenance instruction manual Translation of the original inst...

Page 2: ......

Page 3: ...loop load in relation to the power supply voltage 7 4 3 Connection diagram 7 4 4 Material of the area the sensor faces 8 4 5 Sensor positioning 8 4 6 Quality of the surface the sensor faces 9 4 7 Run...

Page 4: ...TR NC 8 Rev 02 2013...

Page 5: ...rotor in correspondence to the measuring point and a cable connect ed to a signal power and processing board Initially designed and developed for monitoring steam turbines of large thermoelectric pow...

Page 6: ...d eddy currents in the target The induced eddy currents generate an impedance variation in the sensor which measured and linearised by dedicated electronics is converted into a signal proportional to...

Page 7: ...3 94 mV m GAP BNC centre scale output 5 00VDC GAP BNC scale start output 1 07VDC GAP BNC scale end output 8 94VDC Sensitivity to temperature according to ANSI API 670 93 Power supply 24VDC nominal Op...

Page 8: ...m Corrente mA Distanza mm TR NC 8 LOOP Corrente mA Sensibilit mA mm 8 00mA mm 5 3 000 3 200 3 400 3 600 3 800 4 000 4 200 4 400 4 600 4 800 5 000 0 00 1 00 2 00 3 00 4 00 5 00 6 00 7 00 8 00 9 00 10 0...

Page 9: ...d as their failure might place the aux iliary supply network out of service and hence also the monitoring instruments If the power supply is necessarily centralized for various instruments suitable de...

Page 10: ...140 stainless steel 42CrMo4 as reference material which is normally used in the construction of machine shafts 4 5 Sensor positioning The magnetic field generated by the sensor is propagated in all di...

Page 11: ...using mechanical devices such as dial gauges or a no contact transmitter The measurement is to be made with a number of revolutions between 1 and 100 where vibration phenomena do not occur Electrical...

Page 12: ...ases machines already have the necessary holes so that the transducers can simply be fitted and then adjusted to obtain the exact air gap Otherwise the sensors can be installed on brackets or rigid su...

Page 13: ...tion Remember that the length of the connection between the sensor and the transmitter should not be changed as this would result in changes in instrument linearity and calibration With the machine st...

Page 14: ...12 TR NC 8 Rev 02 2013...

Page 15: ...GAP terminals move the sensor a bit at a time until reading 5VDC on the voltmeter and lock the sensor in this position 5 2 General rules for proper electrical installation Themonitoringsystem consist...

Page 16: ...rectly bolted onto this earth plate Take particular care in choosing the cable clamps as they must ensure a secure shield connection 5 2 2 Wiring The sensor connection cables should not be laid parall...

Page 17: ...control and they should come together only upstream of the earth stake Otherwise slight leakage to earth of a power device might shift the zero reference of the control device The earth cable must hav...

Page 18: ...16 TR NC 8 Rev 02 2013...

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