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CRVW3 3-Channel Vibrating Wire Datalogger

CRVW3 3-Channel Vibrating Wire Datalogger

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The CRVW3 uses vibrating wire spectral-analysis technology to provide the best measurement possible for vibrating wire sensors. vibrating wire spectral-analysis technology observes the incoming sensor signal, performs a Fourier transform and a spectral analysis, and determines the sensors’ frequency by identifying the strongest signal in the acceptable range, disregarding external noise.

The CRVW3 provides the following data: the resonant sensor frequency, thermistor resistance for temperature calculation, and diagnostic values to help determine the validity of the frequency measurement.


Complete data acquisition system in a single product
3-channel vibrating wire datalogger (vibrating wire and thermistor)
Wireless routing communications with integrated radio options
Charge regulator for easy solar-panel connection
Enclosure rated to IP66
Configurable channels (no programming)
Integrated rechargeable or alkaline battery options


Processor: ST ARM CORTEX-M4 (32-bit with hardware FPU, running at 144 MHz)
Data Storage: 16 MB serial flash, up to 420,000 records (single channel), up to 160,000 records (3 channels)
Clock Accuracy: ±3 minutes per year
Measurement Interval Range: 1 s to 1 day
USB Micro B: Direct connect to PC (supplies power for configuration and data collection), 2.0 full speed, 12 Mbps
Configuration: software configurable, no programming required

Channel Count: 3 vibrating wire (VW) and 3 thermistor/RTD (temperature) measurements
Measurement Speed: 1 s per sensor (VW and temperature)

Vibrating Wire
Measurement Excitation Options: 2 V (±1 V), 5 V (±2.5 V),12 V (±6 V)
Measurement (Frequency) Resolution: 0.001 Hz RMS (-40° to +70°C)
Time-series Basic Resolution: 24-bit ADC
Measurement Accuracy: ±0.005% of reading
Measurement Method: VSPECT (Spectral Analysis), U.S. Patent No. 7,779,690, includes diagnostic data

Temperature (Resistance)a
Measurement Method: half-bridge ratiometric, 24-bit ADC, built-in completion resistor 4.99 kΩ 0.1%
Resolution: 0.01 Ω RMS (-40° to +70°C)
Accuracy: ±0.15% of reading (-40° to +70°C)

Wireless Communications

-RF451 Option
Internal Radio Description: 1 W, 902 to 928 MHz license-free band, frequency hopping spread-spectrum radio
IC: 2329B-FGR2
Radio Repeater: Devices with the -RF451 option can be set up as a radio repeater

Charge Terminal: 16 to 28 Vdc from solar panel or dc power converter
Battery Options: rechargeable 7 Ah or 8 D-cell alkaline

Weight: 4.2 kg (9.2 lb) with rechargeable battery, 3.0 kg (6.6 lb) with alkaline batteries
Operating Temperature Range: -40° to +70°C
Compliance: RoHS
Enclosure Dimensions: 24.1 x 22.9 x 14.0 cm (9.5 x 9.0 x 5.5 in.)
Weather-proof Enclosure Rating: NEMA 4X (IP66) with proper use of cable entry points
Enclosure Mounting: Stainless-steel universal mount for pole/wall mount (optional) or plastic mounting tabs (included)


One year against defects in materials and workmanship