Campbell VWIRE 305 Manuale utente

Revision: 11/2020

Campbell Scientific, Inc.

Table of contents

1. Introduction 1

2. Precautions 1

3. Initial inspection 1

4. Quickstart 2

4.1 Equipment 2

4.2 Procedure 3

5. Programming quickstart using DVWToolbox 6

6. Overview 7

6.1 Input channels 7

6.2 Dynamic sample rates 8

6.3 Static measurement 8

6.4 Embedded thermistor or RTD 8

6.5 Rainflow histograms 9

6.6 Diagnostics 9

6.7 Data use 9

7. Specifications 9

7.1 Vibrating wire – specifications 9

7.2 Temperature – specifications 10

7.3 Module 10

7.3.1 Communications 10

7.3.2 System 11

7.3.3 Power requirements 11

7.3.4 Compliance 11

7.3.5 Physical attributes 11

8. Installation 11

8.1 Install driver for computer connection 12

8.2 Operating systems 12

8.3 Configuring VWIRE 305 12

8.3.1 Configuring using DVWToolbox and LoggerNet 13

8.3.2 Configuring with the CPIAddModule() instruction 13

Table of Contents - i

8.3.3 Configuring with Device Configuration Utility 13

8.3.4 Configuring with CPIStatus table 14

8.4 Data logger connection 14

8.5 Connecting multiple GRANITE Measurement Modules 15

8.5.1 Daisy-chain topology 15

8.5.2 Star topology 16

8.6 Power connection 16

8.6.1 Power-up sequence 17

8.7 Earth ground connection 17

8.8 Mounting in an enclosure 17

8.9 Field installation 19

8.9.1 Field installation equipment 19

8.9.2 Field installation procedure 20

9. Operation 22

9.1 VWIRE 305 sample rate 22

9.2 VWIRE 305 settings 23

9.3 VWIRE 305 outputs 28

9.4 Connections 31

9.4.1 Sensor connections 31

9.4.2 CPI network bit rate 32

9.5 Analyzers and channel numbers 33

9.6 Data logger program 33

9.6.1 Program code 34

9.6.1.1 Pipeline mode 34

9.6.1.2 VWIRE 305 programming 34

CDM_VW300Config() 34

CDM_VW300Dynamic() 34

CDM_VW300Static() 34

CDM_VW300RainFlow() 35

RainFlowSample() 35

CPISpeed() 35

CPIAddModule() 35

9.7 Data quality 35

9.7.1 Amplitude warning flags 36

9.7.2 Diagnostic codes 36

9.7.3 DVWToolbox errors 37

9.7.4 Excitation strength 38

Table of Contents - ii

9.7.5 Frequency filters 38

9.7.5.1 Harmonics 39

9.7.5.2 Estimated frequency range 39

9.7.5.3 Actual frequency range 39

Matching estimated and actual frequency ranges 40

9.7.6 Frequency warning flags 41

9.7.7 Sample rate and noise performance 41

9.7.8 Standard deviation 41

9.8 Sensors 42

9.8.1 Sensor basic design features 42

9.8.2 Basic measurement of the sensor 42

9.8.3 Vibrating wire length and tension 42

9.8.4 Sensor output frequency range and maximum sample rate 43

9.8.5 Temperature sensor 43

9.9 Status of input channels and sensors 45

10. Troubleshooting 45

10.1 CPIStatus table 46

10.2 COMM status LED 47

10.3 CPI port LEDs 47

10.4 Replacing a GRANITE measurement module 47

11. References and attributions 48

Appendix A. VSPECT measurement theory 49

Appendix B. Vibrating wire digits conversion 50

Appendix C. Calculating vibrating wire measurement error 52

C.1 Error example: Geokon strain gage 52

C.2 Error example: DGSI embedment strain gage 53

C.3 Error example: DGSI spot-welded strain gage 53

C.4 Error example: Geokon 4420 crack meter 54

C.5 Error example: DGSI piezometer 52611099 54

Appendix D. Measuring thermistors and PRTs 55

D.1 Converting PRT resistance to temperature 55

D.2 Converting thermistor resistance to temperature 55

D.2.1 Thermistor measurement accuracy and resolution 56

Table of Contents - iii

1. Introduction

Designed around Campbell Scientific’s VSPECT™ measurement technology, the VWIRE 305

Dynamic Vibrating Wire VSPECT Analyzers measure vibrating wire sensors at rates up to 333.3 Hz

with high accuracy. You can use an analyzer without a data logger in a bench test, or one or

more analyzers with a Campbell Scientific data logger in a field installation.

This manual discusses the use of the VWIRE 305 with the following products, which are sold

separately:

lWall Charger 12 VDC 800 mA Output, 100-240 VAC

lCPI Network Kit

lGRANITE data logger

lLoggerNet data logger support software

2. Precautions

lREAD AND UNDERSTAND the Safety (p. 1) section at the front of this manual.

lWARNING:

oProtect from over-voltage

oProtect from water

oProtect from ESD (electrostatic discharge)

lIMPORTANT: Maintain a level of calibration appropriate to the application. Campbell

Scientific recommends factory recalibration of the VWIRE 305 every three years.

3. Initial inspection

lThe VWIRE 305 ships with the following:

oGRANITE Parts Kit (1)

lInspect the packaging and contents for damage immediately. File damage claims with the

shipping company.

VWIRE 305 1

lCheck packaging materials for all products. Check model numbers, part numbers, product

descriptions, and cable lengths against shipping documents. Model or part numbers are

found on each product. Cable numbers are normally found at the end of the cable that

connects to the measurement device. Check that expected cable lengths were received.

Contact Campbell Scientific immediately if you find any discrepancies.

lCheck the operating system version in the VWIRE 305, and the data logger. Update as

needed. See Operating systems (p. 12).

4. Quickstart

This procedure will get the VWIRE 305 set up to make measurements before connecting it to a

GRANITE data logger. This procedure, makes real-time measurements of vibrating wire sensors. It

does not store data (storing data requires an attached data logger).

4.1 Equipment

lVibrating wire sensor

lVWIRE 305 analyzer

lPower supply (Wall Charger 12VDC 800mA Output, 100-240VAC 50 60Hz, 6ft Cable is used

in this procedure)

lUSB cable

lComputer

lDVWToolbox software

VWIRE 305 2

The following figure shows a general schematic of connections:

FIGURE 4-1. General schematic

4.2 Procedure

1. Install DVWToolbox software on the computer. The DVWToolbox installation also installs

USB drivers for the VWIRE 305.

2. Connect the sensors to the VWIRE 305 (FIGURE 4-2 (p. 3) and FIGURE 4-3 (p. 4)). For

further guidance on connecting sensors, see Sensor connections (p. 31).

FIGURE 4-2. Three-wire sensor connection schematic (no embedded thermistor)

VWIRE 305 3

FIGURE 4-3. Five-wire sensor connection schematic

3. Connect the power supply to the VWIRE 305 power connector as shown.

FIGURE 4-4. Opening the power connector terminals

4. Plug in the power supply. The VWIRE 305 COMM Status light flashes yellow. Channel

Status lights may flash or remain dark.

5. Connect the USB cable between a standard computer USB port and the VWIRE 305USB

port.

VWIRE 305 4

6. Open DVWToolbox. A window similar to the following figure appears:

7. In the Com Port list, select CDM-VW300 (COMn).

The Com Port box displays CDM-VW300 (COMn). Your COMn number may differ from

that shown.

8. Connect

DVWToolbox and the VWIRE 305 connect and the button at lower left will show

Disconnect.Device Type,Serial Number,Device Name, and CPI address at lower center are

active. Depending on the state in which the VWIRE 305 was last used, channels may or may

not be enabled.

9. Check the Enable box for channels to which sensors are connected. If the correct channels

are selected, a green Channel Status flash indicates the sensor attached to that channel is

working. Lights of disabled channels are dark. For other flash combinations, see Status of

input channels and sensors (p. 45).

VWIRE 305 5

The main DVWToolbox window will look similar to the following figure:

lIf a sensor does not have a temperature sensing element, the value in the Static

Thermistor column will be negative (Channel 1).

lReasonable values in the Dynamic Frequency and Static Frequency columns indicate

the sensor outputs a vibrating wire signal. Check the values against the manufacturer

provided documentation to see if sensor output is within the correct frequency

output range.

lThe absence of information icons indicates the VWIRE 305 detects no

measurement faults. If you see an information icon, see DVWToolbox errors (p. 37).

10. For more information on adjusting Sample Rate, enabled channels, and Frequency

Boundaries see VWIRE 305 settings (p. 23), and VWIRE 305 outputs (p. 28).

5. Programming quickstart

using DVWToolbox

Campbell Scientific DVWToolbox is an easy way to generate a simple CRBasic program for your

Campbell Scientific data acquisition system.

VWIRE 305 6

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