CRVW3 Three-Channel Vibrating Wire Datalogger
Self-Contained Vibrating Wire Data Logger
Using patented VSPECT® technology
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Visão Geral

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.

Learn about our patented VSPECT® spectral-analysis technology at our VSPECT® Essentials web resource.

The dynamic vibrating wire measurement technique is protected under U.S. Patent No. 8,671,758, and the vibrating wire spectral-analysis technology (VSPECT®) is protected under U.S. Patent No. 7,779,690.

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Benefícios e Características

  • 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

imagens

CRVW3 inside view with RF452 radio option
CRVW3 inside view with RF452 radio option
CRVW3 inside view with RF452 radio option
CRVW3 enclosure case
CRVW3 enclosure, front view, showing cable entry points and antenna (sold separately)
CRVW3 enclosure, front view, mounted to a pole (sold separately)
CRVW3 enclosure, back view, mounted to a pole using a universal mounting bracket (sold separately)
CRVW3 enclosure, bottom view, with antenna connection and cable entry points (typical of the radio options)

Descrição Técnica

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.

Note: The CRVW3 requires Device Configuration Utility (DevConfig) v 2.10 or later. When radio options are used, the CRVW3 requires LoggerNet v 4.3 or later.

Especificações

-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])

Compatibilidade

Sensors

The CRVW3 Vibrating Wire Datalogger is capable of measuring the most common vibrating wire sensors including, but not limited to, strain gages, piezometers, pressure transducers, tiltmeters, crackmeters, and load cells. The CRVW3 has three sensor inputs; each sensor input includes a vibrating wire sensor connection and a thermistor connection. The channels are easily configured for traditional sensors. Individual channels can be adjusted to read only the vibrating wire sensor, or they may be turned off completely.

Network Considerations

The CRVW3 can be ordered with several wireless communication options. The following table illustrates wireless communications compatibilities in terms of networks.

CRVW3 Network Compatibility

RF400a RF401A
RF401a
RF430a		 RF407 RF411A
RF410a
RF411a
RF431a		 RF412 RF416
RF432a
RF415a		 RF422 RF450a
RF451a
RF452
CRVW3-RF407
CRVW3-RF412
CRVW3-RF422
CRVW3-RF451
CRVW3-RF452

Notes: aRetired product; no longer available.

Enclosure Considerations

The CRVW3 comes in a package designed for field deployment. The electronics, battery, and electrical connections are all contained within the enclosure. The CRVW3 is supplied with a basic mounting kit, or a metal universal mounting bracket can be added to facilitate installation on a post or wall.

Power Considerations

The CRVW3 can be ordered with either a rechargeable battery or a D-cell alkaline battery pack. When the rechargeable battery is used, the CRVW3 can be easily wired to a solar panel, and the rechargeable battery will be charged using the built-in regulator on the CRVW3.

Downloads

Device Configuration Utility v.2.30 (46.9 MB) 02-10-2024

A software utility used to download operating systems and set up Campbell Scientific hardware. Also will update PakBus Graph and the Network Planner if they have been installed previously by another Campbell Scientific software package.

Supported Operating Systems:

Windows 11 or 10 (Both 32 and 64 bit)

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Perguntas Frequentes Relacionadas

Number of FAQs related to CRVW3: 11

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  1. After the CRVW3 is ordered, can the power options be changed?

    Yes. The batteries can be switched at any time between the D-cell battery option and the rechargeable battery option.

  2. How quickly can a CRVW3 take measurements?

    The CRVW3 takes approximately 1 s to measure the vibrating wire sensor and thermistor. If all three channels are measuring sensors, the CRVW3 takes approximately 3 s to measure the sensors before it is ready to begin the cycle again.

  3. After the CRVW3 is ordered, can the communication options be changed?

    The communications options (such as –RF451) reflect how the CRVW3 is built during the manufacturing process. After a CRVW3 is ordered with a specific communications option, it retains that option. It is possible to turn off the wireless communications, and the CRVW3 can be deployed as a stand-alone data logger.

  4. Can the CRVW3 be deployed by itself?

    Yes. The CRVW3 can be used as a stand-alone data logger. If the CRVW3 is not connected to a network, data is collected by connecting directly to the CRVW3 (via USB) or through a simple wireless connection, as outlined in the manual.

  5. Does the CRVW3 have to communicate data after every measurement?

    No. The CRVW3 has built-in memory and can be configured in a variety of ways. It can measure data frequently and communicate the data at a slower rate (for example, measure every 10 minutes and communicate the results once per day). The CRVW3 can also communicate data after each measurement is taken.  The ability to configure the communications on a network to an application's specific needs allows the user to better manage the power consumption on the CRVW3, as well as on the base data logger.

  6. Can the CRVW3 be used with multiplexers?

    No. The CRVW3 is designed to be a simple, quickly deployed system with minimal modifications. The simple design of the CRVW3 does not enable it for use with multiplexers. When an application requires multiplexers, consider using a CR6 Measurement and Control Datalogger instead.

  7. Can the CRVW3 communicate with other data loggers?

    Yes. The CRVW3 is a PakBus device that can communicate with other PakBus data loggers. The neighbor data logger requires a radio device compatible with the CRVW3 radio option. If a CRVW3-RF451 model is used, the neighbor device needs to have an RF450 or RF451 radio installed to enable wireless communications. After connecting to the first neighbor, PakBus routing can be used to reach other PakBus devices available to that neighbor via any type of active communications link (TCP/IP, WiFi, etc.) Network Planner is a tool within LoggerNet used to design a network and explore how devices communicate.

  8. What needs to be done before installing a CRVW3?

    Not much. The CRVW3 needs to be configured, installed, and wired at the site. These steps have been outlined in the Quick Deploy guide that ships with the CRVW3 and is also available for download on this website. The manual is a more detailed resource to address any installation questions.

  9. How does the CRVW3 communicate the data?

    There are multiple communication options depending on how the CRVW3 is ordered. All CRVW3 devices can communicate data and be configured using the built-in USB connection. If a CRVW3 is ordered with a wireless communication option, it can also communicate the data wirelessly to a PC or another data logger.

  10. How many AM16/32B multiplexers can be connected to a data logger at the same time?

    A practical maximum is to connect one multiplexer per every two control terminals on the data logger. Control terminals can be shared between multiplexers to increase the number of connected multiplexers. Sharing terminals, however, requires more complex wiring and programming. Users who would like to connect more than one multiplexer per every two control terminals are advised to contact a sales or support engineer at Campbell Scientific for assistance.

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