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These
sensors can be specially made to given specifications for output
characteristics and operating parameters. They are ideal for remote
monitoring of slow angular motion, as they have smooth response
and inherent damping.
The 'Engel & Gibbs' trading style specialise in developing and manufacturing
tilt sensors from hard glass, selected to be a perfect match to
the electrodes fitted within the switch to ensure they are particularly
robust and damage resistant.
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The
sensors have been designed to have a very long life and superior
performance. The electrode plates are constructed from precious
metal and processed to minimise current density and gassing and
the non-corrosive electrolyte has a stable life-span. Optimum switch
life is achieved by using a pure, stable AC supply (4-15V, 400Hz)
and with high impedance ICs, avoiding polarised supplies from discharging
capacitors.
An
electrolytic sensor can be considered as an AC liquid potentiometer,
where the output analogue signal varies with tilt angle --a voltage
sensitive circuit can sense direction of tilt. The circuit impedance
is changed if rotation is in line with sensor axis.
Temperature
and vibration tolerant.
The electrolytic sensor can be used on equipment where vibration
is severe, as the viscosity of the electrolyte provides inherent
damping. The viscosity can be modified according to the application,
however, the viscosity reduces at very high temperatures - affecting
the performance (impedance and time constant decrease.) The standard
electrolyte has been selected for applications with low vibration
and the time constant is low enough to follow the rate of tilt.
These sensors operate satisfactorily over the ambient temperatures
of - 15 degrees celsius to 100 degrees celsius and will withstand
- 54 degrees without derangement, as this will not effect the null
position. High temperature effects can be minimised either by using
temperature bridge compensating resistors or by using a temperature
controlled environment. (Usually 60 - 70 degrees celsius.)
Sensor
Types.
Electrolytic sensors can be classified into basic groups, according
to performance and shape. Longitudinal (tubular) sensors can be
used over a limited range. These can be installed in bridge circuits
for direct control of loads - dual axes coverage is possible by
using a pair of sensors mounted at right angles. Disc sensors offer
a linear output over a wide angle. Details of many specific sensors
and sensor mounts are available on request - for standard and custom
manufactured units in two classifications.
Linear: Wide range linear and proportional electrolytic sensors.
Null resolution is as good as can be achieved consistent with linearity
requirements.
Null-resolution: These are high resolution non-linear sensors,
in which null resolution is the most important feature.
We
are able to supply or overhaul sensors mounted and tested in final
assembled form, replacing sensors as necessary. All work is correctly
referenced to mechanical zero and is subject to full inspection
procedures. We are also able to supply equivalent units of other
origin (against specification)
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