AVW211

Name: AVW211
Brand: Campbell Scientific
SKU: 20750
Availability: Discontinued

922 MHz Wireless 2-Channel Vibrating Wire Analyzer Module

AVW211

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922 MHz Wireless 2-Channel Vibrating Wire Analyzer Module

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AVW211 922MHz Wireless 2-Channel Vibrating Wire Spectrum Analyzer ModuleAVW211
922MHz Wireless 2-Channel Vibrating Wire Spectrum Analyzer Module -ST -25 to +50C 1. AVW211 PTO 922MHZ WI 2. AVW211 922MHZ WIRELE922MHz

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Model:: AVW211
Item Number:: 20750
Warranty:: 1 year
Lead time:: 14 days

Overview

AVW211 922MHz Wireless 2-Channel Vibrating Wire Spectrum Analyzer Module

The AVW211 is a vibrating wire analyzer module that includes an internal 920 to 928 MHz spread-spectrum radio for wireless communication, typically used in Australia and New Zealand. 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 AVW211 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 AVW211 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 AVW211 typically transmits its data to an RF411A spread-spectrum radio that is connected to the data logger. The AVW211 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.
Internal Radio Frequency Range: 920 to 928 MHz
Radio Power: 250 mW

Older AVW211 analyzer modules (serial # < 11676) have 100 mW radios.
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
Memory: 2 MB of OS Flash
CE Compliance Standards to which Conformity Is Declared: EC61326:2002
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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Related Resources

Documents

Videos and Tutorials

VSPECT™ vs. Noisy Data
July 23, 2025 (3:20)
Using VSPECT technology to filter electrical noise interference.
Watch