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how can we calibrate RADAR LEVEL transmitter 0% to 100%
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Answer Posted / sam
You need to be more specific in your questions but I assume
you are referring to the frequency modulation radar (cone
type) and not the wave guide pulse radar (TDR).
This is a very generic procedure, use your radar's vendor
manual to do the calibration.
Take a measuring tape and measure the actual distance from
the cone to the zero position and the 100% position in your
vessel. If it is a closed pressurized vessel use the design
engineer's internal vessel drawings. If all else fail use
the dimensions of the vessel itself to determine what and
where z/100% is on the vessel. Use the vendor manual to see
how to use these measurements. It might be as simple as
entering these values directly as your z/100% calibration
values or you might have to do a small calculation like
maximum possible distance (tank depth) minus z measured
distance equals zero distance, and maximum possible (tank
depth) distance minus 100% measured distance equals 100%
distance.
Also keep in mind radars are distance measuring instruments
and not level measuring instruments and the fact that the
distance measurement is the exact opposite of level in
relation to the total distance measurement. This means if
your tank total distance is 3 meter (assuming tank bottom is
also zero position) and your radar measures a DISTANCE of 2
meters to the top of your product in the tank, the actual
LEVEL in the tank is only 1 meter.
It is easy to look at the disply on the radar and think this
is your actual level measurment. You therefore need to
modify the local display to indicate level in mm or %, as
well as setup your output to level and not distance after
the calibration. The radar will then give out 4mA when the
tank is empty as per example above and 100% as the tank fill
up with product to the point where you have specified 100%
should be. If your output is setup for distance it will
output the exact opposite. Watch out!!
If you need a vendor manual download it from the internet.
Good luck
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