Vibrating Wire Datalogger
The model VWLog is a multi-channel vibrating wire acquisition instrument, which is suitable for vibrating wire signal and temperature acquisition output by steel string sensors. It can be used for stress,strain, deformation, seepage pressure and other physical quantity monitoring and safety and stability analysis of dams, bridges,embankments, traffic municipal projects and high slopes.
Overview
This instrument uses the latest 32-bit microprocessor with high-efficiency FFT (Fast Fourier Transform) algorithm to realize accurate frequency calculation for the frequency signal output of the vibrating wire sensor. High degree of integration, strong anti-interference performance, adopting general standard RS485 interface and interface lightning protection design, so that the data collector can operate safely and stably in harsh working conditions.
The acquisition instrument sends a frequency sweep or pulse excitation signal through the processor to excite the steel string oscillation, and the steel string oscillation generates an induced electromotive force. The signal is processed by the signal conditioning circuit, including signal filtering and amplification, and the amplified signal is collected and processed.
Product performance characteristics
1. The upgraded version of the full isolation RS485 interface, lightning protection, anti-interference;
2. Using 16-bit A/D converter, the frequency accuracy reaches ± 0.05Hz;
3. Compatible with all single-coil vibrating wire sensors, with built-in constant current excitation circuit, and providing acquisition scheme for vibrating wire sensors with built-in thermistor temperature measurement mode;
4. In view of the power frequency interference, increase the power frequency notch filter to enhance the signal anti-interference ability
Specifications
|
Type |
VWLog-8/16/32 |
VWLog-8/16-D |
|
Channel |
8/16/32 |
8/16 |
|
Measurement |
Frequency, Temperature |
Frequency, Temperature |
|
Excitation Method |
Pulse |
Pulse |
|
ADC |
16bit |
12bit |
|
Frequency |
||
|
Measuring Range |
400Hz~3800Hz |
400Hz~3800Hz |
|
Resolution |
0.01Hz |
0.02Hz |
|
Accuracy |
±0.05Hz |
±0.05Hz |
|
Time BaseAccuracy |
±30ppm |
±30ppm |
|
Temperature |
||
|
Sensor Type |
Digital temperature sensor Thermistor temperature sensor |
Digital temperature sensor Thermistor temperature sensor |
|
Measuring Range |
-55℃~125℃/-20℃~150℃ |
-55℃~125℃/-20℃~150℃ |
|
Resolution |
0.01℃ |
0.01℃ |
|
Accuracy |
±0.5℃ |
±0.5℃ |
|
Storage |
||
|
Flash |
32MB |
16MB |
|
Data Capacity |
1000k |
500k |
|
Communication |
||
|
Communication Method |
RS485 |
RS485 |
|
RS485 Parameters |
9600 band,8 bit,1 stop, no parity |
9600 band,8 bit,1 stop, no parity |
|
Physics |
||
|
Temperature Range |
-40℃~85℃ |
-40℃~85℃ |
|
PowerSupply |
DC12V/2A |
DC12V/1A |
|
Static Current |
130mA@25℃ |
35mA@25℃ |
|
Sensor Connect |
Quick plug |
Plug-in terminals |
|
Weight |
2.3kg |
0.5kg |
|
Size (L*W*H) |
310mm*220mm*105mm |
210mm*100mm*30mm |
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