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CRVW3 3-Channel Vibrating Wire Datalogger with RF Radio Option
Self-Contained Vibrating Wire Datalogger with RF Radio Option
Using patented VSPECT™ technology
weather applications supported water applications supported energy applications supported gas flux & turbulence applications supported infrastructure applications supported soil applications supported

Overview

The CRVW3 is a self-contained, low-cost, 3-channel VSPECT vibrating wire datalogger. It is designed to be an independent datalogger, or a reliable component in a larger data acquisition system. Arriving field-ready from the factory with power, communications, and an enclosure, the CRVW3 is built for your monitoring needs.

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Benefits and Features

  • Reads and stores data from one to three vibrating-wire sensors
  • Complete data acquisition system in a single product
  • Charge regulator included for solar panel connection
  • 3-channel vibrating-wire datalogger (vibrating wire and thermistor)
  • Wireless routing communications with integrated radio options
  • Charge regulator for easy solar-panel connection
  • Simple programming interface
  • Enclosure rated to IP66
  • Configurable channels (no programming)
  • Compatible with many existing Campbell Scientific data acquisition networks
  • Integrated rechargeable or alkaline battery options
  • PakBus router/radio repeater capabilities

Images

CRVW3 Inside View
CRVW3 Inside View
CRVW3 Inside View
CRVW3 Mounted Enclosure with Inside View
CRVW3 Mounted Enclosure, Front View
CRVW3 Mounted Enclosure, Back View with Universal Mounting Bracket
CRVW3 Enclosure Bottom, Antenna Connection, and Cable Entry Points (typical of the radio options)

Technical Description

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, 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.

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.

Specifications

-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 is CE approved, but the -RF451, -RF407, and -RF412 options are not CE approved.
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 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
Operating Temperature Range -40° to +70°C
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)
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

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 ohm RMS @ 3000 ohm (approximately 0.00015°C RMS for most vibrating-wire thermistors)
Accuracy ±0.15% of reading (-40° to +70°C)

-RF451 Option

Internal Radio Description 5 to 1000 mW, user selectable; 902 to 928 MHz license-free band, frequency hopping spread-spectrum radio
Radio Repeater Devices with the -RF451 option can be set up as a radio repeater.
Compliance Information
  • KNYAMM0921TT (United States FCC ID)
  • 2329B-AMM0921TT (Canada [IC])

-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.
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.
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
EU Conformity View the EU Declaration of Conformity in the Documents section of the web page.

Compatibility

Sensors

The CRVW3 Vibrating-Wire Datalogger is capable of measuring the most common vibrating-wire sensors including, but not limited to, strain gauges, 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
RF451
CRVW3-RF407
CRVW3-RF412
CRVW3-RF422
CRVW3-RF451

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.2.16 (46.3 MB) 18-08-2017

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 10, 8.1, 8, and 7 (Both 32 and 64 bit)

View Revision History

CRVWx Firmware v.4.0 (906 KB) 14-06-2017

Current version of the CRVWx firmware.  Requires the Device Configuration Utility to upload the firmware to the CRVWx.

View Revision History

FAQs for

Number of FAQs related to CRVW3: 11

Expand AllCollapse All

  1. A practical maximum is to connect one multiplexer per every two control terminals on the datalogger. 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.

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

  3. 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.

  4. 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 datalogger.

  5. Yes. The CRVW3 can be used as a stand-alone datalogger. 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.

  6. 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 datalogger.

  7. 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.

  8. Yes. The CRVW3 is a PakBus device that can communicate with other PakBus dataloggers. The neighbor datalogger 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.

  9. 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 datalogger.

  10. 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.