CEN-801000

Instruments and systems for geotechnical and structural monitoring

cRio Multi-Channel Acquisition Unit mod. cRio_VW01

DESCRIPTION cRio_VW is the hardware module for the reading of the

Vibrating Wire and NTC instruments, developed to be integrated into the platform CompactRIO National

Instruments. Pizzi instruments, with more than 30 years of experience in developing, manufacturing and installation

of sensors and systems for geotechnical and structural monitoring, has been selected and accredited by National

Instruments as an alliance partner for the development of reading modules of vibrating wire sensors to be integrated

in the CompactRIO platform. The module cRio_VW has been developed by Pizzi

Instruments in collaboration with the Technical Staff of National Instruments to allow the National Instruments

System to integrate the vibrating wire instruments, widely

used for accuracy, reliability and stability in all kind of geotechnical, structural and hydrological monitoring.

The module cRio_VW can read most of the vibrating wire sensors on the

market and ensures a perfect integration into hw National Instruments.

cRIO is a modular system which, thanks to its flexibility, can be connected to the interface modules and allows to

realize any required solution for data acquisition or

control activity. In combination with cRIO_VW allows you to create solutions that are extremely versatile and

attractive for geotechnical, structural and hydrological monitoring systems.

The integration of the CompactRIO + cRIOvW system with the multiplexer modules developed by Pizzi Instruments

are used to configure

multichannel systems of centralization up to 128 sensors in the same system.

The multiplexer is managed through the cRio_DMux module, which consists of a dedicated communication

driver between the multiplexers and the cRio_VW. The main qualities of the solution

CompactRIO + I / O Pizzi Instruments modules are: Versatility in the applications: integration and

compatibility with I / O modules allow you to configure modular systems customized to meet specific technical

requirements, Reliability and Accuracy in measurements and controls,

High strength in the components to ensure applications in harsh environments,

Easy to set up thanks to LabVIEW systems.

CEN-801000

Instruments and systems for geotechnical and structural monitoring

• cRio_D_Mux01

• cRio_VW01

• Mux8_2

APPLICATION

The vibrating wire sensors due to their reliability, precision and stability are widely used in structural, geotechnical

and hydrological monitoring. The integration between the Pizzi Instruments Vibrating

Wire modules and the National Instruments CompactRIO system provides an optimal solution for automatic

monitoring systems where there are vibrating wire instruments and whenever reliability, precision and

integrability with additional controls are required to the system.

Typical applications for the system with CompactRIO module Vibrating Wire are monitoring of:

---Dams ---Bridges

---Tunnel

---Landslides ---Structures near to construction

zones or structural problems ---Mines

---Pipeline ---Pile

---Geotechnical, structural and hydrological monitoring

FEATURES AND BENEFITS

---Reading interface for vibrating wire sensors developed by National Instruments CompactRIO systems

---High resolution in the VW and NTC measurement ---Possibility to configure multichannel systems with

centralization up to n° 128 channels in a single CompactRIO system.

---Versatility of the systems realized with CompactRIO + cRIO VW thanks to the integration of additional

modules to be able to create a customized system. ---Analog filters to eliminate problems related to incorrect

measurements due to electrical noise ---Simple configuration through interface developed in

LabVIEW development environment Ease of application development control, measurement

and analysis through the LabVIEW graphical

programming environment ---Self-diagnostic for the control of the goodness of

measurement, the correct operation of the module and the system, the quality of the signals of the sensors

---Possibility to interface with the majority of the wibrating wire sensors in commerce

---Robust system developed to work in critical work environments.

---Accurate system for overvoltage protection

OPERATING PRINCIPLE

The Vibrating Wire CompactRIO module has been

developed in accordance with specifications and technical standards of NI.

In order to guarantee the perfect functionality and compatibility with National Instruments hardware, the

module has passed all the tests carried out by National

Instruments Corporate NI in its offices in Austin, Texas Area, USA.

NI CompactRIO is the embedded system for monitoring and control offered by National Instruments, a leader in

automation and control. NI CompactRIO is composed of the NI embedded

controller for communication and processing, the chassis in which is housed the chip FPGA (field programmable

gate array) programmable by the user, a number of I / O modules hot-swappable, including modules developed and

produced by Pizzi instruments. For programming and

configuration the system uses the LabVIEW graphical

programming tools. The module Vibrating Wire CompactRIO has been developed to ensure the reading of

most vibrating wire sensors on the market, with a resolution of 0.02 Hz for the vibrating wire instrumentation

and 24 bits for the NTC. The application of digital filters

and self-diagnostic features eliminate the problems related to incorrect measurements due to electrical noise. The

configuration of the system is done in a simple and intuitive interface configuration software platform built

with LabVIEW graphical development. The potential of the programming environment of LabVIEW allow both a

simple interface customization and configuration management of the system and the development of

software platforms for professional monitoring, measurement and analysis of system and data monitoring.

CEN-801000

Instruments and systems for geotechnical and structural monitoring

SPECIFICATIONS

General information

Format CompactRIO Target Windows / Real Time

Type of measurement Vibrating Wire/ NTC temperature Type of insulation Ground insulation channel – ground

Type of vibrating wire sensors Piezometers, crackmeters, clinometers, straingauge, load cells, pressure cells, settlement cells, etc.

Type of thermistor NTC 3K Conformity ROHS Yes

Analogical Input

Channel 2

Resolution VW: 0,02 Hz/Temp. 24 bit Accuracy VW: 0,02 Hz/Temp. 0,1°C

Sampling Frequency 1 S/s Measuring Range VW: 300÷6.000 Hz / Temp: - 40,0+80,0 °C

Simultaneous Sampling No

Communication Typology SPI

Baud Rates 1 Mbit/s

External Power Supply Power Supply voltage 9÷36 Vdc

Power Operation Mode 3VA Power sleep mode 1VA

Voltage insulation between electronic module and power supply

150 KV

Insulation capacity between the electronic module and the power supply

200 pF max

Insulation resistance between the electronic module

and the power supply

> 1 GigaOhm

Interface BUS CompactRIO Clock frequency interface SPI 1 Mhz

Isolation voltage between electronic module and CompactRIO bus

2500 Vrms

Maximum current absorption OperationMode 8 mA max Maximum current absorption

SleepMode

0,1 mA max

Physical Characteristics Dimension (mm) 88x70x23

Weight (g) 140 Operating temperature (IEC 60068-2-1) - 40÷+70°C

Storage temperature (IEC 60068-2-1)

- 40÷+85°C

Protection level (IEC 60529) IP 40 Operating humidity (IEC 60068-2-56) 10÷90% RH non condensing

Storage humidity 5÷95% RH non condensing

Pollution Degree (IEC 60064) 2 Maximum altitude 6.000 mslm

CEN-801000

Instruments and systems for geotechnical and structural monitoring

• Fig. 1 Layout of CRio_VW

Type of measurement CRio_VW Type of measurement Range Misura UdM Type of sensor CV OG 0,1200÷1,6000 Khz2 Galileo Vibrating Wire (350÷1250 Hz)

CV OG1 0,1200÷1,6000 Khz2 Pizzi Instruments Vibrating Wire (350÷1250 Hz) CV mode A 166,2÷2222,2 µsec Vibrating Wire (450÷6.000 Hz)

CV mode B 1440,0÷12250,0 Hz2x 10-3 Vibrating Wire (1200÷3500 Hz) CV mode F 6250,0÷36000,0 Hz2x 10-3 Vibrating Wire (2500÷6000Hz)

NTC -40,0 ÷+80,0 °C Thermistor NTC 3 K TEST Functional test

Configuration

According to the configuration of the system that you want to achieve, the CompactRIO Vibrating Wire module needs

the following components:

- StandAlone System: n. 1 vibrating wire sensor + thermistor

•••• Fig. 2 components of the stand alone system

CEN-801000

Pizzi-Instruments S.r.l. Tel/Fax : +39 055 6810722

Via di Ripoli 207/e email: info@pizzi-instruments.it 50126, Firenze, Italia web:www.pizzi-instruments.it

- Multichannel System: up to 128 connected sensors

•••• Fig. 3 components of the Multichannel system

Accessories MUX8_2 multiplexer, 8 channels, 2 wire CEN-804001

Module cRIO_D_mux01 CEN-801002 Module cRio_VW01 CEN-801001

cRIO_Flat Cable CEN-804002

Pizzi Instruments S.r.l. reserves the right to change the information contained in this document without notice. While the information contained herein is assumed to be accurate, Pizzi Instruments S.r.l. assumes no responsibility for any errors, omissions or misinterpretation. Doc. Rev01, 01/13