AVW216

Name: AVW216
Brand: Campbell Scientific
SKU: 20751
Availability: InStock

2.4 GHz Wireless 2-Channel Vibrating Wire Analyzer Module

AVW216

Limited availability

2.4 GHz Wireless 2-Channel Vibrating Wire Analyzer Module

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Model:: AVW216
Item Number:: 20751
Warranty:: 1 year

Overview

The AVW216 is a vibrating wire analyzer module that includes an internal 2.4 GHz spread-spectrum radio for wireless communication in many countries worldwide. With this 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.

Key Advantages

Greatly Reduces Signal Noise
Includes built-in radio

Technical Description

The AVW216 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 AVW216 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.

The AVW216 typically transmits its data to an RF416 spread-spectrum radio that is connected to the data logger. The AVW216 can also be connected directly to the data logger.

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
Remote, wireless operation with on-board radio
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.
Operating Temperature Range: -25° to +50°C
Internal Radio Frequency Range: 2.450 to 2.482 GHz
Radio Power: 50 mW
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
Dimensions: 21.6 x 11.18 x 3.18 cm
(8.5 x 4.5 x 1.2 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

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Replacement Parts

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Compatibility

Sensors

The AVW216 Vibrating Wire Spectrum Analyzer Module allows our data loggers to measure vibrating wire strain gages, pressure transducers, piezometers, tiltmeters, crackmeters, and load cells.

Communications

The AVW216's internal spread-spectrum radio can transmit data to other AVW216 analyzer modules, RF416 spread-spectrum radios, and RF432 spread-spectrum radios. The AVW216 does not have a transparent mode, and therefore its internal radio cannot communicate with the RF415 radio.

Enclosure Considerations

The AVW216 requires a desiccated, non-condensing environment. A Campbell Scientific enclosure is recommended when the analyzer module is in the field. The AVW216 has built-in keyhole flanges for mounting to an enclosure backplate.