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this is
an Intempco
LTX 20 capacitive level sensor this is a
teflon coated product which
is very good for caustic substances
and very easy to calibrate as we will be demonstrating here today
ok
so our first step will be to connect
our power loop power supply
to Loop + and
Loop -
we connect the other end to our
calibrator
at the moment it's showing 4.3mA
There is no
water in the chamber, our first step
is to press the up buttons
both at the same time three seconds and
1, 2, 3
and you let go and then
down buttons for 3 seconds
1, 2, 3.
and this puts it into calibration mode
now our first step is to connect our loop power supply and ammeter
our Milliamp display is showing 4.79mA
and there's
no water
on the sensor at the moment
so we want 4mA as our
low scale, so that's the zero-point
which is shown as Z
right here, so we're going to press down
on the Z button until our display
shows 4mA
so we're at 4mA now, now we're going to fill the column
with water, reference water so that the
the water is at the highest level up to sensor
water is all the way to the top now and we will
Press the S buttons
in order for us to get the appropriate full
scale reading of the sensor
which will be 20mA. So I'm going to press
Oops. I over shot.
So I have to press the down button.
and now it is reading 20mA
and then we return
level to zero
so that we can verify that the zero-point is still going to read
4mA
and as you can see it still does read 4mA