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CBN 30 TECHNICAL SPECIFICATIONS
The CBN 30 electronics unit features 8 sensors inputs and can thus accomodate 8 measurement points (placed on one or several machine).
The inputs are scanned cyclically. The measurement levels are compared with user selectable alarm levels.
To allow the monitoring of several measurement points, each with dfferent noise levels, using the same set of alarm levels for all, each input has its own gain adjustment (potentiometer) which is use to adjust to the same initial level on the display of each sensor. The alarm levels correspond, therefore, to factors of increase over the initial adjstment level, which forms the base of the measurement and identifies the noise level associated with "good" machine function.
With its on-board intelligence, the CBN 30 stores the alarm conditions and identifies the measurementpoint generating the alarm.
The electronics unit housing is fitted with a water tight headset jack permtting the user to verify the mechanical source of the noise measured. In listening, one also duplicates the technique of the mechanicwho uses a screwdriver in touch with the machine surface with the handle held against his ear to listen to the internal noises of the machine. According to the noise heard, a general idea of the possible mechanical source of the noise can be obtained.
Plugging in the headset stops automatically the sensor input scanning. To listen to the various sensor signals the user can change the channel via a button on the electonics unit front panel.
According to the application at hand, the sensor can be furnished with a protection rating of IP 65 or watertight to a depth of 50 meters. For applications in the intrinsic safety zones, sensor with the intresic safety certification EEX ia T5 are available. This certification implies the use of a Zener barrier for each sensor, which must be installed between the sensor and the electronics unit and outside of the explosive zone.
OPTIONAL MODULES
Five complementary circuit modules are available to extend the basic functions :
- MARD 30 : this card features four inputs to accommodate machine running/stpped conditions and four alarm N°2 relay outputs permitting the automatics shut-down for up to 4 machines individually.
- MARD 31 : the same as the MARD 30 with the addition of a multiplexed 4-20 mA analog output. The mesured levels for all sensors present are transmitted via the same wire sequentially and at the rate of the sensor scanning. An impulse to 0 mA at the beginning of the scanning period for sensor one identifies the first sensor in the sequence.
- MARD 32 : the multiplexed 4-20 mA analog output alone.
- MARD 33 : four opto-coupler inputs (to conect in parallel) for validation of the alarms on on the mother board. This card was designed especialy for those applications requiring filetering of certain machine functions (that is their exclusion from the monitoring process). For exemple, water power turbines during off-line operation, scew type compressor in the by-pass mode, etc... Via the opto-coupler input, the validation of alarms is confirmed only during the desired functionnal mode of the machine.
- MARD 34 : the sum of the MARD 32 and The MARD 33 functions.
TECHNICAL SPECIFICATIONS
ELECTRONICS UNIT |
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| Number of sensor inputs | 8 |
| Selection of the last input scanned | per jumper |
| Sensor scanning rate | 4 to 12 sec per channel, adjustable |
| Storage of alarm conditions | yes/no per jumper |
| Relay ouputs (motherboard) | |
|
approx. 3 seconds |
|
230 volts |
|
5 amps |
|
50 to 150 W DC (please consulgt us) |
| Analog bar graph display | 50 segments length 125 mm |
| Headset jack | watertight connection |
| Power supply voltage | 220V 50Hz |
| Power consumption | less than 10 V.A. |
| Electrical protection | fuse 5*20 slow burn plus varistor |
| Operating temperature | 0 to 50°C. |
| Housing ABS | I.P. 65 |
| Dimensions | 160 * 240 *90 (cable ports exuded) |
| Mass | approx. 1,6 kg |
| Norms EM protection | EN50081-2 and EN 50082-2 |
SENSORS |
|
| Pass band (capture and electronics) | 100 to 12000 Hz |
| Operating temperature | -20 to 60°C. |
| Protection rating | I.P. 65 |
| Installation rating | washer and scews CHC 5 |
| Mass excuding wiring | approx. 50 g |
| Wire connections per co-axial 0.22 mm2, insulation plastified PVC | |
| Sensor shaft stainless steel 316L, shrink tube. | |