CRVW3

Vibrating Wire Node
CRVW3

CRVW3

Orderable

Vibrating Wire Node

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Model:
CRVW3
Item Number:
45307
Warranty:
1 year

Overview

The CRVW3 is a self-contained, low-cost, three-channel vibrating wire node. It is designed to be an independent data-acquisition system, or a component of your larger radio-linked data-acquisition network when it is configured with available wireless communications 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.

Key Advantages

Three-Channel, Wireless, Self-Contained Vibrating Wire Node
Capable of measuring up to three vibrating wire sensors using Campbell Scientific’s patented VSPECT™ technology

Technical Description

The CRVW3 Vibrating Wire Node 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.

Benefits

  • 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

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 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])

Common Accessories

(11)

Replacement Parts

(8)

Ships With

(9)

Similar Products

(6)

Compatibility

Sensors

The CRVW3 Vibrating Wire Node 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 communications 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.

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