16
Calibration Methods - introduction
Calibration lockout switch must be OFF to view
and/or change calibration.
Press Set1 and Set2 buttons at the same time...
There are two ways you can calibrate your display, and each way can be done with 2 points
only, or up to 10 linearisation points.
A.
Direct connection of real-time low and high input signal levels, which you
scale the display against. (Zero and Span)
B.
Theoretical scaling, where you use the keyboard to enter expected zero and
full scale sensor signals, and the measurement amounts these relate to .
After a couple of seconds,
display shows...
Press UP or DOWN arrow to change
Press UP or DOWN arrow to change
Press OK to choose.
Press OK to choose.
Examples of Theoretical Calibration...
1.
If you do not yet have your sensor, but know what
its published calibration settings are.
For example, you plan to use a pressure sensor,
which will give 4-20mA for 0-250 Bar. You can
enter the input range of 4-20mA and the
measurement range of 0-250.
2.
If you are a distributor, supplying adisplay to
an end user who will be buying his sensor from
another source. He has told you on his order what
he would like the scaling to be.
Shortly after CAL.SrC appears, the
display will change to show either dIrECt
or tHEor as below.
When you have chosen the Calibration type, it will be saved in your display’s memory, so you
will not need to repeat the procedure.
You may now calibrate your display using your preferred method, on the following pages.
..
Examples of Direct Calibration...
1.
If you want to calibrate a weighing system by
loading it with known calibration weights.
2.
If you want to calibrate a straight-sided tank
gauging system by filling the tank with a known
amount of liquid.
3.
If you are performing a calibration check against
a calibration reference, such as humidity cells, pH
buffers etc.
Press
button
to toggle
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dir
theo
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