Granite VWire 305
Granite VWire 305
Orderable8-Channel Dynamic Vibrating Wire Analyzer
Pricing
Configuration
Sign in for option pricing- Standard DutyVWIRE305-SDPart Number: 34860
- Extended DutyVWIRE305-XDPart Number: 34861
Select a configuration to add to your quote
- Model:
- Granite VWire 305
- Item Number:
- VWIRE305
- Warranty:
- 1 year
Overview
The Granite™ VWire 305 is an eight-channel interface for dynamic measurements of standard vibrating wire sensors. With the VWire 305 interface, you can operate any standard vibrating wire sensor at “dynamic” rates to achieve faster and better measurements without having to purchase or install new sensors.
The interface measures the resonant frequency of the wire between excitations using the patented vibrating wire spectral-analysis technology (VSPECT™). VSPECT provides very fine measurement resolution and limits the influence of external noise by discriminating between signal and noise based on frequency content. Because of this technology, the signal can be carried through longer cables in harsher noise environments, giving you flexibility in your sensor and data acquisition system siting, while providing sensor diagnostics never available before.
Learn about our patented VSPECT spectral-analysis technology at our VSPECT Essentials web resource.
Learn about dynamic vibrating wire sensor measurements at our Dynamic Vibrating Wire 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
With time-proven reliability and stability of vibrating wire sensor technology
Technical Description
In addition to the dynamic vibrating wire measurement, the VWire 305 makes several auxiliary measurements. A static vibrating wire measurement is made once each second, along with the dynamic measurements, which provides finer measurement resolution and greater immunity to external noise sources. The VWire 305 includes a thermistor input channel paired with each vibrating wire channel, featuring high-precision 24-bit measurements at a 1 Hz rate. Unique to the VSPECT technology, a rich set of diagnostic parameters is provided with the vibrating wire data.
The VWire 305 has the capability to simplify post-processing of data by computing common values internally. Vibrating wire data can be reported as measured frequency or as the frequency squared with a multiplier and offset applied. The thermistor data is reported as resistance or is converted to degrees Celsius using the thermistor’s Steinhart-Hart coefficients. The VWire 305 can also internally compile rainflow histograms from the final data and report the values at user-specified intervals.
Vibrating Wire Inputs
Each channel has two terminals for connecting to the coil of the vibrating wire sensor. Both vibrating wire terminals are labeled VW, and the polarity of the wiring is arbitrary. The sensor is excited and measured through the same connections. Sinusoidal excitation is applied for a few cycles of the wire oscillation. The wire is maintained in a continuously vibrating state. Excitation voltage varies automatically to maintain the desired return signal strength.
Thermistor Inputs
Each channel has two terminals for connecting to the thermistor. Both thermistor terminals are labeled T, and the polarity of the wiring is arbitrary. The measurement is a half-bridge configuration with the excitation circuitry and completion resistor integrated into the module.
Benefits
- Dedicated measurement hardware for simultaneous measurement of each channel
- Interfaces to any standard vibrating wire sensor
- Eight simultaneously sampled channels per module; synchronized across multiple modules
- Dynamic measurement rates of 20 to 333 Hz
- Static measurement vibrating wire and thermistor measurements at 1 Hz
- VSPECT spectral interpolation algorithms provide superior noise immunity and measurement resolution compared to time-domain period-averaging approach
- Excitation method providing frequent low-energy pulses to maintain a continuous resonant vibration in the sensor
- Onboard post-processing including frequency conversion, temperature conversion, and rainflow histogram calculation
- CPI DAQ connection for channel expansion
- USB 2.0 interface for PC-based operation
Specifications
- -NOTE-
- Electrical specifications are valid over a -40° to +70°C range, non-condensing environment, unless otherwise specified. Extended electrical specifications are valid over a -55° to +85°C range in a non-condensing environment.
- Operating Temperature Range
- -40° to +70°C
(standard)
-55° to +85°C(extended)
- Scan Rates
- 20, 50, 100, 200,or 333 Hz
(dependent upon the resonant frequency of the gages)
- CPI Baud Rate
- Selectable from 25 kbps to 1 Mbps
- Input Resistance
- 5 kΩ
- Excitation Voltage Range
- 0 to ±3 V
(6 V peak-to-peak)
- Excitation Voltage Resolution
- 26 mV
- Measurement Frequency Accuracy
- ±(0.005% of reading + measurement resolution)
- Sustained Input Voltage without Damage
- -0.5 to +7.1 V
- USB
- USB 2.0 full speed connection is available for attaching the device to a PC.
(This port is provided to configure the module, send updates, and communicate with the Dynamic Vibrating Wire Toolbox software. The USB port is not provided for use within a permanent data collection system.)
- CPI
- Used for connection to the data logger. Baud rate selectable from 50 kbps to 1 Mbps.
(Allowable cable length varies depending on baud rate, number of nodes, cable quality, and noise environment, but can be as long as 2,500 ft under proper conditions.)
- Mounting
- Standard 1-in. grid
(Optional DIN rail mounting available.)
- Dimensions
- 20.3 x 12.7 x 5.1 cm
(8 x 5 x 2 in.)
- Weight
- 816.47 g
(1.8 lb)
Measurement Resolution at Sample Rates
- -NOTE-
- Typical values for a 2.5 kHz resonant sensor
- 1 Hz Sample Rate
- 0.005 Hz RMS
(noise level)
- 20 Hz Sample Rate
- 0.008 Hz RMS
(noise level)
- 50 Hz Sample Rate
- 0.015 Hz RMS
(noise level)
- 100 Hz Sample Rate
- 0.035 Hz RMS
(noise level)
- 200 Hz Sample Rate
- 0.11 Hz RMS
(noise level)
- 333.3 Hz Sample Rate
- 0.45 Hz RMS
(noise level)
Sensor Resonant Frequency Range
- 20 Hz Sample Rate
- 290 Hz
(minimum sensor frequency)
6000 Hz(maximum sensor frequency)
- 50 Hz Sample Rate
- 290 Hz
(minimum sensor frequency)
6000 Hz(maximum sensor frequency)
- 100 Hz Sample Rate
- 580 Hz
(minimum sensor frequency)
6000 Hz(maximum sensor frequency)
Thermistor
- Completion Resistor
- 4.99 kΩ 0.1%
- Excitation Voltage
- 1.5 V
- Resolution
- 0.002 Ω RMS
(@ 5 kΩ thermistor resistance)
- Accuracy
- 0.15% of reading
(Thermistor accuracy and resistance of the wire should be considered as additional errors.)
- Measurement Rate
- 1 Hz
Power Requirements
- Voltage
- 9.6 to 32 Vdc
- Typical Current Drain
- 190 mA
(@ 12 Vdc)
Common Accessories
(7)35690
GRANITE Series DIN Rail Kit for 2 in. Modules
The 35690 can be purchased as an accessory to mount the 5.08 cm (2 in.) GRANITE™ modules on a DIN-Rail instead of the standard backplate mounting.
Orderable28900
CAT5e Ethernet Unshielded Cable with RJ45 Connectors, 10 ft
An RJ45 cable may be needed, and several options are available. The 28900 is one option. The 28900 is a 10 ft, unshielded, CAT5e network cable with RJ45 connectors. It is typically used to connect one of our many Ethernet-capable products to an Ethernet device or network connection.
Orderable28901
CAT5e Ethernet Unshielded Cable, RJ45 to RJ45, 50 ft
An RJ45 cable may be needed, and several options are available. The 28901 is one option. The 28901 is a 50 ft, unshielded, CAT5e cable with RJ45 connectors. It is typically used to connect CDM devices together or to a data logger. This cable can also be used to connect one of our many Ethernet-capable products to an Ethernet network connection.
OrderableHUB-CPI
8-Channel RJ45 Hub for CPI Peripherals
The HUB-CPI may be used to connect multiple CPIs in parallel together. The HUB-CPI allows eight CPI (CAN peripheral interface) devices to be connected together in parallel. Typically, this configuration includes one data logger and up to seven CDMs (Campbell distributed modules) or sensors that use CPI.
Orderable29370
CPI Network Kit
One 29370 is needed for each CPI network. Among the items included in the 29370 kit is a roll of yellow vinyl electrical tape to distinguish Ethernet cables that use CPI protocol from similar cables used for TCP/IP.
Orderable8125
Flat-Bladed Screwdriver, 2.5 mm Blade x 50 mm Shaft
The 8125 is needed if the VWire 305 is not ordered with a data logger or if the screwdriver that came with the data logger has been lost. The 8125 is a small, flat-bladed screwdriver that is extremely useful for opening the guillotine terminals on our data loggers and measurement control devices.
Orderable39177
1.67 A 24 Vdc Power Supply
The 39177 converts 100 to 240 Vac to a regulated 24 Vdc. The 39177 comes standard with a USA/Canada plug, with an option to add a kit for international use. On one end, the 39177 has a plug that inserts into a wall socket. There are several cable termination options for the other end of the cable.
Orderable
Other Accessories
(2)DAQ Case 15
Data Acquisition (DAQ) Laboratory and Field Case
The DAQ Case 15 is a cost-effective and convenient carrying case for your valuable data acquisition equipment. This case is specifically configured for GRANITE™ Data Acquisition Systems and Campbell Scientific data loggers. The DAQ Case 15 is optimized for applications that require easy transport in a lab, in the field, or for short-term deployments.
OrderableGranite Chassis
GRANITE Data Acquisition Systems Chassis
The Granite™Chassis is a platform for housing a complete GRANITE system. The Granite Chassis can hold up to eight modules, which may include the DAQ (Granite™10, Granite™9, or Granite™6), CH400, and additional GRANITE measurement modules. Portability and protection are fundamental to the design, delivering optimal system performance in demanding conditions—especially when heat must be dissipated quickly. Up to five panel faces (four top, one rear) can be customized to mount a wide variety of connectors, providing rapid connection to the DAQ system, which is ideal for time-sensitive or repetitive testing applications. As a GRANITE system scales to larger arrays of sensors and supporting GRANITE modules, several additional Granite Chassis can be daisy-chained to expand the GRANITE DAQ network. With the optional Rackmount Slide-Rail Kit, the Granite Chassis can be easily mounted in a standard four-post server rack cabinet.
Orderable
Replacement Parts
(9)505
Screw #6-32 x .375 Pan Phillips
These screws, along with the 6044 grommets, are commonly used together to secure our equipment to the backplates of our enclosures.
Orderable6044
Grommet for #6 or #8 Screw
These grommets are commonly used with the 505 screws to secure our equipment to the backplates of our enclosures.
Orderable28490
Red Wire and Black Wire Power Cable Set
These grommets are commonly used with the 505 screws to secure our equipment to the backplates of our enclosures.
Orderable28898
CAT6 Ethernet Unshielded Cable with RJ45 Connectors, 6 in.
The 28898 is a 6 in., unshielded, CAT6 network cable with RJ45 connectors. It is typically used to connect CDM devices together or to an SC-CPI. This cable is also used to connect one of our many Ethernet-capable products to an Ethernet device or network connection.
Orderable28899
CAT6 Ethernet Unshielded Cable with RJ45 Connectors, 2 ft
The 28899 is a 2 ft, unshielded CAT6 network cable with RJ45 connectors. It is typically used to connect CDM devices together or to an SC-CPI. This cable is also used to connect one of our many Ethernet-capable products to an Ethernet device or network connection.
Orderable27555
USB 2.0 Cable, Type A Pin (Male) to Micro B Pin (Male), 6/6.5 ft
The 27555 is a USB Type A to Micro B, pin (male)-to-pin (male) cable, 6 to 6.5 ft long. It connects devices using the Micro B interface to a USB port on a computer.
Orderable29474
Stainless-Steel Screw #10-32 x .500 Slotted Set Cut Point
The 29474 is a ground lug with a slotted notch on its top that may be purchased to replace a lost or damaged ground lug.
Orderable26031
Spring Plug Terminal Connector
The 26031 is a power connector that may be purchased to replace a lost or damaged connector.
Orderable30267
Replacement Terminal Plug for CDM-VW300 or CDM-VW305
The 30267 removable terminal plug does not include the label. It may be purchased to replace a lost or damaged plug.
Orderable
Compatibility
The VWire 305 is compatible with CPI-enabled data loggers only.
Compatible Products
(3)
Related Resources
Case Studies
Documents
- Technical Paper
Instrumentation for Making High-Precision Dynamic Vibrating Wire Measurements Using Standard Single-Coil Gages
January 2017
View Document - Compliance
GRANITE VWIRE 305 UK Declaration of Conformity
View Document - Document
Temporary External Case Substitution Letter
February 2022
View Document - Manual
VWIRE 305 8-Channel Dynamic Vibrating Wire Analyzer
May 2026
View Document
Showing 4 of 8 results
See all DocumentsDownloads
- DVW Tool Boxv1.3Login required
January 1, 1990
Software ApplicationsDVW Tool Box is an application-specific software tool for demonstration and evaluation of the CDM-VW300, CDM-VW305 and VWire 305 dynamic vibrating wire interfaces.
- VWire 305 program examplev1Login required
January 16, 2020
Software ApplicationsProgram to read 20 Hz dynamic data from two VWire 305 analyzers measuring eight channels each.
- VWire 305 OSv6
November 18, 2019
OS and FirmwareExecution of this download installs the VWire 305 Operating System on your computer for upload to the VWire 305 device with Device Configuration Utility.
- CPI Calculatorv1.0Login required
July 6, 2016
Software ApplicationsThe CPI Calculator is a downloadable Microsoft Excel spreadsheet used to estimate the usage and capacity of a CPI network. The calculator provides an overview on CPI devices including the CDM-A108, CDM-A116, CDM-VW300, CDM-VW305, and the CSAT3B. The calculator can also estimate the measurement speed of the CDM-A108 and CDM-A116 based on the number of channels and measurement parameters. The CPI Calculator is an estimation tool and will help you better understand and design CPI networks by considering the following: What is the capability of each CDM or CPI device What is the CPI network capacity How much of the CPI capacity are the CDMs or CPI devices using
Videos and Tutorials
Dynamic Vibrating Wire Analyzers | An Introduction
April 12, 2013 (4:48)
Analzyers that enable dataloggers to read vibrating wire sensors
Watch
Webinar | VSPECT™—Patented Spectral-Analysis Technology
May 28, 2021 (48:50)
Spectral analysis of vibrating wire sensors for accuracy, confidence, and trust
Watch
VSPECT™—Understanding the Basics
August 17, 2021 (3:10)
Animated VSPECT video
Watch
VSPECT™ vs. Noisy Data
July 23, 2025 (3:20)
Using VSPECT technology to filter electrical noise interference.
Watch