CRVW3-NE

Vibrating Wire Node without Enclosure
CRVW3-NE

CRVW3-NE

Orderable

Vibrating Wire Node without Enclosure

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Model:
CRVW3-NE
Item Number:
CRVW3-NE
Warranty:
1 year

Overview

The CRVW3-NE is a 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-NE and the CRVW3 are similar products that share the same electronic components. The main difference between them is that the CRVW3-NE allows you to select the enclosure and battery, whereas the CRVW3 includes an environmental enclosure and battery as a complete system.

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 Vibrating Wire Node
Capable of measuring up to three vibrating wire sensors using Campbell Scientific’s patented VSPECT™ technology

Technical Description

The CRVW3-NE 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-NE 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-NE requires Device Configuration Utility (DevConfig) v 2.10 or later. When radio options are used, the CRVW3-NE 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
  • Simple programming interface
  • Compatible with many existing Campbell Scientific data-acquisition networks
  • PakBus router/radio capabilities
  • User-selectable battery and enclosure options

Specifications

-NOTE-
All CRVW3-NE 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, -RF412, and -RF427 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
Static Vibrating Wire Measurements
Supported
Mounting
Mounting holes for easy mounting and installation in a Campbell Scientific enclosure
Dimensions
18.4 x 12.7 x 4.5 cm

(7.25 x 5.0 x 1.75 in.)

Weight
0.36 kg

(0.8 lb)

Power

Charge Terminal
16 to 28 Vdc

(from solar panel or dc power converter). Typical applications use 10 to 20 W panels.

Battery Terminal
Sealed, rechargeable, lead-acid batteries.

Typical applications use 7, 12, and 24 Ah rechargeable batteries.

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)

846A-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.

-RF427 Option

Internal Radio Description
5 to 250 mW, user selectable; 905/920 MHz license-free band, frequency hopping spread-spectrum radio
Radio Repeater
Devices with the -RF427 option can be set up as a radio repeater.
Where Used
Brazil
Compliance Information
08335-17-10644

Brazil (ANATEL standards in Resolution No. 506)

-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

(13)

Replacement Parts

(7)

Similar Products

(6)

Compatibility

Sensors

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

CRVW3-NE Network Compatibility

RF400a RF401A
RF401a
RF430a		 RF407 RF411A
RF410a
RF411a
RF431a		 RF412 RF416
RF432a
RF415a		 RF422 RF427 RF450a
RF451a		 RF452
CRVW3-NE-RF407
CRVW3-NE-RF412
CRVW3-NE-RF422
CRVW3-NE-RF427b
CRVW3-NE-RF451
CRVW3-NE-RF452

Notes: aRetired product; no longer available. 

Enclosure Considerations

The CRVW3-NE can be installed in various Campbell Scientific enclosures; mounting screws are included with the CRVW3-NE for easy installation. Compatible enclosures include the ENC10/12 and larger.

Power Considerations

The CRVW3-NE requires an external power source and has a built-in charger/regulator. The charge terminal accepts 16 to 28 Vdc. The battery terminal will charge a 12 Vdc sealed-rechargeable lead acid battery when the charge terminal receives adequate power. Typical applications utilize 10 to 20 W solar panels (SP10 and SP20) to charge 7, 12, and 24 Ah rechargeable batteries (BP7, BP12, and BP24). 

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