Gems Sensors - PRODUCT NEWS

       
Slimline ground water monitoring sensor
from Gems aids World water resource management.

The 9500 series of pressure transducers from Gems
Sensors has been designed specifically to meet the
rigorous conditions and accuracy requirements of
hydrometric applications such as ground water
monitoring.  In addition the 9500 series can be used
to replace mercury manometers, which represent a
health hazard, and also shaft encoders where they
are being used for level measurement. Use of the 9500
series, with its simple installation and calibration, could
save around 1500 Euros per site in commissioning
costs whilst delivering the same performance.

Hydrometry, the measurement of every variable in the water
cycle, is vitally important in the management of world water
resources. As we enter the third millennium, more than 25%
of the world’s population does not have safe drinking water.
Water will become a major issue in this decade, and place
an increasing demand on the acquisition of accurate hydrometric
data, the key to efficient management of resources.

The quantity and quality of groundwater must be monitored,
as well as inputs and outputs such as rainfall, evaporation
and soil moisture. This means that accurate, reliable readings
are required to ensure the integrity of the data. The remote
nature of most applications means that battery powered data
loggers using SDI-12 protocols are commonly used to collect
data from up to 8 sensors.

The Gems Series 9500 incorporates the latest microprocessor
based digital compensation techniques combined with an
ultra-stable media isolated sensor to provide not only best
in class accuracy but also lowest current draw to maximise
battery life. This makes it the ideal choice for level measurement
where SDI-12 loggers are being used.  The 9500 also provides
a temperature output to ±0.5°C.

In addition to the SDI-12 output the 9500 is available with a high
accuracy 4-20mA analogue output.  Both options offer the
customer simple installation and rangeability via a pc interface
module, which negates the need for the units to be calibrated
against dead-weight testers.

This will minimise installation time and with the built-in SG
compensation means the unit has a total error band of <0.1%
over –5 to 45°C.

The 9500 has a diameter of only 20mm, a slim profile designed
specifically to provide maximum usability in groundwater applications.
It is rated for operation from -25 to +70 deg C and is constructed
in 316 stainless steel, polyurethane and acetal.

Other applications for the 9500 include tank level monitoring and
also oceanographic applications such as tide monitoring, offshore
platform levelling and R.O.V depth control.
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January 2005
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