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 datalogger 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.Read More
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 indivdual 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 datalogger. The AVW211 can also be connected directly to the datalogger.
|Internal Radio Frequency Range||920 to 928 MHz|
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)
|RS-232 Port||1 9-pin RS-232 port (for connecting to a datalogger 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)|
|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.)|
|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|
|Active RS-232 Communication||~6 mA|
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
|CR10 (retired)||The CR10 supports the SDI-12 mode only.|
|CR10X (retired)||The CR10X supports the SDI-12 mode only.|
|CR23X (retired)||The CR23X supports the SDI-12 mode only.|
|CR5000 (retired)||The CR5000 supports the SDI-12 mode only.|
|ENC10/12||If using the RS-232 port, the AVW211 must be mounted flat to fit in an ENC10/12.|
|ENC10/12R||If using the RS-232 port, the AVW211 must be mounted flat to fit in an ENC10/12R.|
|ENC12/14||If using the RS-232 port, the AVW211 must be mounted flat to fit in an ENC12/14.|
The AVW211 Vibrating-Wire Spectrum Analyzer Module allows our dataloggers to measure vibrating-wire strain gages, pressure transducers, piezometers, tiltmeters, crackmeters, and load cells.
The AVW211's internal spread-spectrum radio can transmit data to an AVW211, RF411A, RF411, or RF431. The AVW211 does not have a transparent mode, and therefore its internal radio cannot communicate with an RF410 radio.
The AVW211 requires a desiccated, non-condensing environment. A Campbell Scientific enclosure is recommended when the analyzer module is in the field. The AVW211 has built-in keyhole flanges for mounting to an enclosure backplate.
The AVW211 is typically powered by the datalogger's power supply.
Newer analyzer modules with 250 mW radios must use OS 5 or higher for their operating system.
Number of FAQs related to AVW211: 12
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No. An AVW206, AVW211, or AVW216 is not capable of communicating with other AVW200-series modules.
The AVW200-series modules are not required, but they do reduce the chance of erroneous readings by filtering electrical noise that is sometimes present.
The AVW200 must be wired directly to the datalogger via a cable.
The AVW206, AVW2011, and AVW216 have built-in spread-spectrum radios tuned to different frequencies that allow the datalogger to communicate with a remote AVW device through an appropriate radio link.
Two probable causes are the following:
It takes 2 s for the AVW200-series modules to acquire a measurement from each sensor. An AVW200-series module servicing two AM16/32B multiplexers, each with 16 vibrating-wire sensors, requires approximately 64 s to acquire data.
Use pn 17855, Data Cable, RS-232 Male to Pigtail.
Yes, using a null modem cable.
Two multiplexers, each with a maximum of 16 or 32 sensors per multiplexer, can be attached. If temperature measurements are excluded from each sensor, 32 sensors are possible.