Piezoelectric vibration gauge VDT–231 for VVK-331 Control and Alarm Device
Piezoelectric vibration gauge VDT–131 (VDT-231) converts mechanical vibrations into an electrical signal proportional to the vibration velocity.
VDT-131 (VDT-231) is used together with the Vibration unit of the VVK-331 Control and Alarm Device for measuring the vibration of rotor machines and mechanisms in industrial conditions in various industries.
Elements
|
№ |
Item |
Quantity |
|
|
VDT-131 |
VDT-231 |
||
|
1. |
Piezoelectric vibration gauge |
2 |
1 |
|
2. |
2-channel gauge amplifier |
1 |
1 |
Functions
· Sensor charge amplifier;
· Limitation of the vibration gauge’s conversion ratio;
· Alignment of the sensor’s output impedance with the communication line of the vibration gauge and secondary measuring instruments;
· Operating mode - continuous, round-the-clock.
Brief specifications
|
№ |
Parameter |
Value |
Notes |
|---|---|---|---|
|
1. |
Sensor type |
Piezoelectric accelerometer |
|
|
2. |
Number of measurement axes VDT-131 |
1 |
|
|
3. |
Number of measurement axes VDT-231 |
2 |
|
|
4. |
Nominal value of the conversion ratio by voltage, mVs2/m |
50 |
at the base frequency of 80 Hz |
|
5. |
Vibration gauge’s amplitude nonlinearity,%, max |
10 |
|
|
6. |
Cross conversion relative ratio,%, max |
10 |
|
|
7. |
Operating frequency range, Hz |
from 20 to 1,000 |
|
|
8. |
Operating range fluctuations of the vibration gauge’s amplitude-frequency response,%, max |
10 |
|
|
9. |
Resonance frequency, Hz, min |
3,500 |
|
|
10. |
Electric capacitance of the measuring plate with the cable, pF |
from 1,800 to 2,500 |
|
|
11. |
Electric capacitance of the control plate with the cable, pF |
from 3,500 to 4,500 |
|
|
12. |
Power |
DC |
|
|
13. |
Dimensions (length, width, height), mm |
|
|
|
Sensor |
58´89´62 |
|
|
|
Cased amplifier |
275´170´92 |
|
|
|
Cable length, m |
10 |
|
|
|
14. |
Weight with the cable, kg, max |
13 |
|
Operating conditions
|
№ |
Item |
Temperature, °С |
Relative humidity,% |
|---|---|---|---|
|
1. |
Vibration gauge sensor |
from + 10 to + 100 |
98 (at the temperature of +35°С) |
|
2. |
Gauge amplifier |
from + 5 to + 70 |
80 (at the temperature of +25°С) |
The sensor can withstand the velocity of up to 60 m/s2
Average service life is at least 10 years.