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Vibrating Wire Node

Model EWN-01V/08V Overview

Model EWN-01V/08V series of wireless vibrating wire nodes are designed to expand the data collection possibilities from vibrating wire sensors via wireless RF network, eliminating the need for running lengthy cables. These are especially useful at locations where sensors are distributed over wide areas and running cable lengths to long distances can be tricky and /or at locations where construction activity can disrupt the running sensor cables.

It is available in variants to connect a single (model EWN-01V) to eight (model EWN-08V)sensors with inbuilt thermistor. The node is capable of exciting and sampling vibrating wire sensors.

The complete range of vibrating wire sensors can be connected to wireless node including:

·         Piezometer, water level sensor

·         Strain gage

·         Pressure cell

·         Displacement sensor, extensometer, crack meter, joint meter

·         Temperature meter

·         Settlement monitoring sensor

The wireless vibrating wire node is a highly reliable integrated system which is capable of exciting and sampling vibrating wire sensors and reporting measurements through long range radio frequency wireless communication network to the Gateway. A cloud-hosted data management and configuration software is used to manage the network. The configuration is done with an easy to use smartphone application that comes free with the system. Gateway uploads the collected sensor data to the central/cloud server.

Drishti, a cloud-hosted data management software is available to process and manage the huge data collected at project site. The data is accessible 24 x 7, in meaningful visual formats, to all the related authorities. The system can generate automatic reports and provide automated alerts over SMS or email for any reading crossing the pre-defined alert levels.

Specifications


VIBRATING WIRE NODE

 Inputs (VW sensor)

 Excitation wave: 8 V

 Frequency measurement range: 450 – 6000 Hz

 Frequency resolution: 0.01 Hz

 Frequency accuracy: ±0.033% FS

 EWN-01V- 1 VW sensor

 EWN-08V – up to 8 VW sensors

 Thermistor

 Range: -20 to 80°C for 3K

 Resolution: 0.1°C

 Accuracy: 0.1% FS

 Operating temperature

 -40 to 80°C

 Internal memory

 Up to 500,000 readings with time

 Supply Voltage

 2.7 V to 5.5 V

RADIO FREQUENCY

 Radio bands

 Sub-1 GHz band – complies with unlicensed ISM band specifications in most countries

 Link data speed

 625 bps – 2.5 kbps variable bitrate

 Data security

 AES128 encrypted end to end data