The CRVW3-NE is a three-channel vibrating-wire data logger. It is designed to be an independent data logger, or you can use it as a reliable component in your larger data acquisition system. The CRVW3-NE has multiple communication options and a power regulator for easy solar panel and battery connection.
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.
The VSPECT technology is protected under U.S. Patent No. 7,779,690.
The CRVW3-NE 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.
|Operating Temperature Range||-40° to +70°C|
|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|
|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)|
|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.|
|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)|
|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.|
|Where Used||US, Canada, Australia|
|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|
|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.|
|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.|
|-NOTE-||To be released for use in Brazil.|
The CRVW3-NE Vibrating-Wire Data Logger is capable of measuring the most common vibrating-wire sensors including, but not limited to, strain
The CRVW3-NE can be ordered with several wireless communication options. The following table illustrates wireless communications compatibilities in terms of networks.
Notes: aRetired product; no longer available. bRadio option to be released at a future date.
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.
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).
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)
Current version of the CRVWx firmware. Requires the Device Configuration Utility to upload the firmware to the CRVWx.
Number of FAQs related to CRVW3-NE: 10
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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.
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.
Yes. The batteries can be switched at any time between the D-cell battery option and the rechargeable battery option.
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.
Yes. To connect with an existing network, it is important to use the same or compatible radios. If an older radio model is used on the network, the radios can be updated to a more recent model, or two types of radios can be used with a single data logger to act as a radio technology bridge (gateway). For example, a CR1000 with an RF401 and RF450 can be used to communicate with older RF401-compatible devices and also with the CRVW3-RF451.
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.
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.
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 Data Logger instead.
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.
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.