CRVW3 Three-Channel Vibrating Wire Datalogger

Self-Contained Vibrating Wire Data Logger Using patented VSPECT® technology

The CRVW3 is a self-contained, low-cost, three-channel vibrating wire data logger. It is designed to be an independent data logger, or a component of your larger radio-linked data-acquisition network when it is configured with available wireless communication options. The CRVW3 includes a factory-integrated power supply and a weatherproof enclosure.

Category:

The CRVW3 uses vibrating wire spectral-analysis technology (VSPECT®) to provide the best measurement possible for vibrating wire sensors. 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 strongest signal in the acceptable range while filtering out environmental and electrical 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.

Benefits and Features 

    • Reads and stores data from one to three vibrating wire sensors 
    • Charge regulator included for solar panel connection 
    • Enclosure rated to IP66 
    • Simple programming interface 
    • Integrated rechargeable or alkaline battery options 
    • Compatible with many existing Campbell Scientific data acquisition networks 
    • PakBus router/radio repeater capabilities 
-NOTE-
  • All CRVW3 dataloggers are tested and guaranteed to meet the following electrical specifications in a -40° to +70°C non-condensing environment.
  • The base -NA option and -RF422 option are CE approved, but the -RF451,
    -RF452, -RF407, and -RF412 options are not CE approved.
Operating Temperature Range
  • -40° to +70°C
  • Non-condensing environment
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)
Real-Time Clock Accuracy ±3 min. 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
Compliance RoHS
Warranty One year against defects in materials and workmanship
Weatherproof 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)
Static Vibrating Wire Measurements Supported
Enclosure Dimensions 24.1 x 22.9 x 14.0 cm (9.5 x 9.0 x 5.5 in.)
Weight
  • 4.2 kg (9.2 lb) with rechargeable battery
  • 3.0 kg (6.6 lb) with alkaline batteries
Power
Charge Terminal 16 to 28 Vdc (from solar panel or dc power converter)
Battery Options Rechargeable 7 Ah or 8 D-cell alkaline
Current Drain
  • 1 mA (no radio, basic operation)
  • ~37.5 mA/s (each time a channel is measured)
Measurements
Channel Count 3 vibrating wire (VW) and 3 thermistor/RTD (temperature) measurements
Measurement Speed 1 s per sensor (VW and temperature)
Measurements – 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 (-40° to +70°C)
Measurement Method VSPECT® (Spectral Analysis), U.S. Patent No. 7,779,690, includes diagnostic data
Measurements – Temperature (Resistance)
-NOTE- Thermistor or RTD resistance can be scaled to Temperature (Deg C) per manufacturer specifications. The resulting temperature can be used as a correction factor for the sensor’s output.
Measurement Method Half-bridge ratiometric, 24-bit ADC, built-in completion resistor 4.99 kΩ 0.1%
Thermistor Precision 0.020 Ω RMS @ 3000 Ω (~0.00015 °C RMS for most vibrating wire thermistors)
Accuracy ±0.15% of reading (-40° to +70°C)
-RF407 Option
Internal Radio Description 5 to 250 mW, user selectable; 902 to 928 MHz license-free band, frequency hopping spread-spectrum radio
Radio Repeater Devices with the -RF407 option can be set up as a radio repeater.
Where Used US, Canada
Compliance Information
  • MCQ-XB900HP (United States FCC Part 15.247)
  • 1846A-XB900HP (Industry Canada ([IC])
  • RCPDIXB15-0672-A2 (Mexico IF)
-RF412 Option
Internal Radio Description 5 to 250 mW, user selectable; 915 to 928 MHz license-free band, frequency hopping spread-spectrum radio
Radio Repeater Devices with the -RF412 option can be set up as a radio repeater.
Where Used Australia
Compliance Information
  • ACMA RCM
  • MCQ-XB900HP (United States FCC Part 15.247)
  • 1846A-XB900HP (Industry Canada [IC])
-RF422 Option
Internal Radio Description 2 to 25 mW, user selectable; 863 to 870 MHz license-free band, frequency hopping spread-spectrum radio
Where Used Europe and some of Asia (ETSI)
EU Conformity View the EU Declaration of Conformity in the Documents section of the web page.
-RF452 Option
Internal Radio Description 10 to 1,000 mW, user selectable; 902 to 928 MHz license-free band, frequency hopping spread-spectrum radio
Radio Repeater Devices with the -RF452 option can be set up as a radio repeater.
Where Used US, Canada, Australia
Compliance Information
  • KNYAMM0921TT (United States FCC ID)
  • 2329B-AMM0921TT (Canada [IC])

Brochures: CRVW3 3-Channel Vibrating Wire Datalogger

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Brochures: Vibrating Wire Spectral-Analysis Technology (VSPECT)

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