AVW200

Name: AVW200
Brand: Campbell Scientific
SKU: AVW200
Availability: InStock

2-Channel Vibrating Wire Analyzer Module

AVW200

Orderable

2-Channel Vibrating Wire Analyzer Module

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Configuration

-25 to +50C (Ships as 19244, 19246, & 10873)AVW200-STPart Number: 42055
-55 to +85C (Ships as 33939, 19246, & 10873)AVW200-XTPart Number: 42056

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Model:: AVW200
Item Number:: AVW200
Warranty:: 1 year

Overview

With an AVW200 vibrating wire analyzer module, your data logger can measure vibrating wire strain gages, pressure transducers, piezometers, tiltmeters, crackmeters, and load cells. These sensors are used in a wide variety of structural, hydrological, and geotechnical applications because of their stability, accuracy, and durability.

Learn about our patented VSPECT™ spectral-analysis technology at our VSPECT Essentials web resource.

The dynamic vibrating wire measurement technique is protected under U.S. Patent No. 8,671,758, and the vibrating wire spectral-analysis technology (VSPECT) is protected under U.S. Patent No. 7,779,690.

Key Advantages

Greatly Reduces Signal Noise
Using patented VSPECT^® technology for better readings

Technical Description

The AVW200 uses vibrating wire spectral-analysis technology (VSPECT). VSPECT observes the incoming sensor signal, performs a Fourier transform and a spectral analysis (transforming the time series into individual sinusoidal components in the frequency spectrum), and determines the sensor frequency by identifying the largest signal in the acceptable range while filtering out environmental and electrical noise.

The AVW200 analyzer module also provides many self-checking diagnostics such as vibrating element signal strength, signal-to-noise ratio, vibrating element signal decay ratio, and incorrect signal response. These diagnostics can be running in the background to give continual feedback of the condition for each sensor.

Benefits

Provides better measurements by significantly reducing incorrect readings caused by noise sources
Interfaces two vibrating wire sensors; more sensors may be connected if an AM16/32B multiplexer is used
Self-checking diagnostics give continual feedback on sensor condition
High resolution—less than 0.001 Hz (industry standard is 0.1 Hz)
Low current drain
Interfaces both temperature and frequency measurements from vibrating wire sensors

Specifications

-NOTE-: Electrical specifications are valid over a -25° to +50°C range unless otherwise specified.
Non-condensing environment required.
Number of Vibrating Wire Sensors Measured: Up to 2 vibrating wire sensors can be connected to the analyzer module.
Additional sensors can be measured by using an AM16/32-series multiplexer.
Power Requirements: 9.6 to 16 Vdc
Analog Input/Outputs: 2 differential (DF) vibrating wire measurements (V+ and V-) and 2 single-ended (SE) ratiometric resistive half-bridge measurements (T+ and T-) for vibrating wire sensor's onboard temperature sensor.
Digital Control Ports: 3 digital control ports (C1 – C3)
C1 functions as an SDI-12 I/O communication port.C2 functions as a Clk output for multiplexer control.C3 functions as a Reset output for multiplexer control.
RS-232 Port: 1 9-pin RS-232 port
(for connecting to a data logger COM port)
Measurement Resolution: 0.001 Hz RMS
(±250 mV differential input range; -55° to +85°C)
Measurement Accuracy: ±0.013% of reading
(±250 mV differential input range; -55° to +85°C)
Input Voltage Range: ±250 mV
(differential) for vibrating wire inputs
Common Mode Range: ±25 V
Baud Rates: Selectable from 1200 to 38.4 kbps.
(ASCII protocol is one start bit, one stop bit, eight data bits, and no parity.)
Memory: Either 128 or 512 kB of SRAM
2 MB of OS Flash
CE Compliance Standards to which Conformity Is Declared: IEC61326:2002
Dimensions: 21.6 x 11.18 x 3.18 cm
(8.5 x 4.4 x 1.25 in.)
Weight: 0.43 kg
(0.95 lb)

Typical Current Drain @ 12 Vdc

Quiescent, Radio Off: ~0.3 mA
Radio Duty Cycling 1 s: ~3 mA
(includes quiescent current)
Radio Always On: ~26 mA
(radio transmit current 100 mA)
Active RS-232 Communication: ~6 mA
(3 s after communication stops, the current will drop to the quiescent current.)
Measurement: ~25 mA
(averaged over the 2 s)

Accessories

(4)

Common Accessories

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Replacement Parts

(6)

Ships With

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Similar Products

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Compatibility

Sensors

The AVW200 Vibrating Wire Spectrum Analyzer Module allows our data loggers to measure vibrating wire strain gauges, pressure transducers, piezometers, tiltmeters, crackmeters, and load cells.

Data Logger Connections

When using SDI-12, a three-conductor cable is required; Campbell Scientific recommends the CABLE3CBL cable. When using RS-232, the module attaches to the data logger’s RS-232 port via the 18663 null modem cable, or attaches to control ports on a CR800, CR850, CR1000, or CR3000 datalogger via the 17855 data cable.

Enclosure Considerations

The AVW200 requires a desiccated, non-condensing environment. A Campbell Scientific enclosure is recommended when the analyzer module is in the field. The AVW200 has built-in keyhole flanges for mounting to an enclosure backplate.