Wireless
Vibrating Wire Systems
Geotechnical
Instrumentation
Web
Shop
Contact
US
Based upon the Keynes
Controls
VibWire-108 sensor interface
- Options for 900 M Hz/ 2.4
G Hz /
Spread spectrum modems
- Indoor/urban range up to
1500 feet
- Outdoor line-of-sight
range up to 20 miles
(with
high gain antenna)
For advice on systems
design,
layout and quotation requests, and data transmission rates
then contact Keynes Controls directly at sales@keynes-controls.com or via the contact for on the
website
Ezi-Log
GPRS Mobile Phone Network Systems -
with Internet access
AquaLog Data
Logger &
Communications Interface
Greatly Reduces
Signal Noise
Wide range of 3rd
Party
Modem support
The Keynes Controls
wireless
vibrating wire systems are modular in approach and therefore are very
flexible and can be configured to operate for many different
applications.
The simplest stand-alone
systems use the GPRS mobile phone network to transfer data from a
remote site to a clients computer system. The GPRS systems
operate where ever there is a mobile phone network and can be moved
from place to place to suit any project requirements.
For local remote systems a
wide
range of radio modems can be used such as spread spectrum units when
there is a lot of electrical interference, to long distance radio
modems for applications outside the range of the GPRS networks.
Fully integrated
barometric
correction can be added using the optional barometer module for true
water height measurements.
The VibWire-108
vibrating wire sensor interface operates with most manufactures
sensors. The device does not require any prior knowledge of the
operating frequency of sensors to be used.
All of the Keynes Controls
vibrating wire sensor interfaces use the auto-resonance
excitation mechanism to maintain the sensors in a continuously
vibrating state as-well as
minimising the amount of energy required to excite the sensor in order
to optimise sensor life.
The module measures the
resonant
frequency of the wire between excitations using an advanced algorithm
to determine the sensor frequency. The VibWire-108
gives a true result and not an interpolated answer as is common using
spectral FFT techniques.
The auto-resonance
approach and advanced algorithm provides very fine measurements, and
the use of 32 bit conversion provides very stable and high resolution
measurements.
- Provides better
measurements by
significantly reducing incorrect readings caused by cabled noise sources
- Un-limited
channel expansion with additional VibWire-108
units.
- Self-checking
diagnostics give continual feedback on sensor condition
- High resolution—less
than
0.001 Hz (industry standard is 0.1 Hz)
- Low current drain -
complete power management using the AquaLOG sensor interface.
- Remote, wireless operation
with a
range of radio Interfaces both temperature and frequency measurements
from vibrating wire sensors
- No vibrating wire sensor
setup
required. Automatic frequency selection. Built in frequency meter.
- Modem power cycling to
prevent
communications failure and maintain data integrity.
User
Manuals
Vibrating
Wire Interfaces
AquaLOG
Data Logger & Communications Interface
VibWire-108
series vibrating wire sensor interface
Measurement Applications
Pore pressure
Water
level
Strain
Displacement
Crack
Load
Pressure cell
Temperature
Ground movement
Concrete fatigue
Typical
Remote Vibrating Wire
Interface Systems
Remote
Communications