Vibrating Wire Datalogger
MAS-VWLog-xx low-power multi-channel vibrating wire acquisition instrument is a kind of rock and soil in-situ monitoring instrument, which is suitable for frequency signal calculation and temperature acquisition of steel string sensor output. Can be used for dam, bridge, slope and other engineering stress, strain, deformation, seepage pressure and other physical monitoring and safety and stability analysis.
Overview
The instrument uses the latest 32-bit microprocessor with high efficiency FFT (Fast Fourier Transform) algorithm for steel string sensor output frequency signal to achieve accurate frequency calculation. The high degree of integration, the use of general standard RS485 interface and interface lightning protection design makes the acquisition instrument safe and stable operation in the harsh working conditions.
The controller sends a sweep excitation signal 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.
Main functional characteristics:
●The equipment is small in size, light in weight, supports guide rails, buckles and other installation methods, and is convenient for wiring
● Support single pulse, multi-pulse, resonance method three excitation modes
● Low power design
● Device can diagnose sensor status
● Compatible with all single coil vibrating wire sensors, built-in constant current excitation circuit, and provide acquisition scheme for vibrating wire sensors with built-in thermistor temperature measurement method
● The acquisition accuracy is 0.05HZ, which can meet the long-term observation requirements of users for high-precision and high-stability projects.
Product application field
● Axial force monitoring for subway construction
● Building stress monitoring
● Strain monitoring of bridges and tunnels
● Ground water pressure monitoring of foundation pit
Specifications
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Technical Specification Sheet |
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Model |
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MAS-VWLog-8-D |
8-channel vibrating wire |
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MAS-VWLog-16-D |
16-channel vibrating wire |
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Frequency reading |
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Measurement range |
400Hz～3800Hz |
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Resolution |
0.02Hz |
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Frequency accuracy |
±0.05Hz |
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Time base accuracy |
±30ppm |
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anti-interference ability |
Strong (single-ended signal) |
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Motivation mode |
Single pulse, multi-pulse (default), resonance method |
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Sensor status diagnosis |
Sensor wiring short circuit, open circuit judgment |
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ADC sampling accuracy |
12Bit |
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▼ Temperature reading |
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Sensor Type |
Digital Temperature Sensor/Analog Temperature Sensor |
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Measurement range |
-55℃ ~ 125 ℃/-20℃ ~ 150 ℃ |
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Resolution |
0.01 ℃ |
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Temperature accuracy |
±0.5℃/ 0.5%F▪S |
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▼ Storage |
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Flash |
16MB |
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Data Capacity |
About 500000 pieces of data |
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Communication |
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RS485 parameters |
9600 band,8 bit,1 stop, no parity |
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USB2.0 |
Full speed -12Mbps |
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Physics |
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Operating temperature range |
-40 ℃ ~ 85 ℃ |
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Anti-surge |
LPZ0B-3 (power supply, RS485 is secondary GDT MOV TVS; signal is primary TVS) |
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Power |
DC12V/1A |
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Quiescent current |
35mA @ 25 ℃ |
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Weight |
0.5KG |
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Interface form |
Plug-in terminal |
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L×W×H |
210 × 88 × 26mm |
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