ВВК-331

VDT-131 piezoelectric vibration gauge 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 threshold threshold

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 4500

 

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.