The AVW216 has the same features and capabilities as the AVW200, with the addition of an internal spread-spectrum radio for wireless communication. The radio operates at the 2.4GHz frequency, for use world wide.

The new AVW200 family of vibrating-wire interface modules applies a new method for measuring the sensors frequency. The traditional method uses a time-domain approach. The natural or resonant frequency at which the wire is oscillating is determined by exciting the wire with an AC excitation, stopping the excitation, and then measuring time between response pulses.

Features

In addition to refining the AC excitation, the new method featured in the AVW200 series takes advantage of a built-in spectrum analyzer that uses spectral interpolation instead of the traditional pulse-timing approach. It samples the returned signal, performs an FFT (fast Fourier transform) to discriminate between spectral components, and then identifies and measures the resonant frequency of the sensor. This means that even in noisy environments the sensor’s resonant frequency can be identified and accurately measured.

Specifications

Internal Radio Frequency: 2.4 GHz
Number of Virbrating Wire Sensors Measured: Up to 2 vibrating wire sensors can be connected to the interface. Additional sensors can be measured by using an AM16/32-series multiplexer.
Power Requirements: 9.6 to 16 Vdc
Typical Current Drain @ 12 Vdc:
~0.3 mA (quiescent, radio off);
~3 mA (radio duty cycling 1 second; includes quiescent current);
~26 mA (radio always on);
~6 mA (active RS-232 communication);
~25 mA (measurement)
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 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 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 Standard to which Conformity is Declared: IEC61326:2002

Producing Area:USA