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5.
CALIBRATION PROCEDURE
Calibration can be performed in two ways, either the CT 24 is
calibrated standard with an amplification of 1mA per 1 mV and no
offset adjusted (see chapter 5.1)
Or a special calibration is made where the amplification and / or
offset are adapted to the sensor (see chapter 5.2).
Necessary equipment for calibration:
-
accurate voltage source
-
power supply ( +12 to +30 Volt)
-
accurate multimeter ( current and voltage)
-
small screwdriver to adjust the potentiometers
-
Resistor (R
) equal to the sensor element impedance
S
5.1
Standard calibration
To perform a standard calibration, connect R
input terminal strip pin 2 and 3. The power supply has to be
connected to the output pins 2 and 3.
Measure the loop current with the multimeter on mA range.
In this situation a zero input is simulated and the zero output can
be adjusted to +4 mA with the zero adjust potentiometer.
Then a +16 mV signal has to be applied to the input. With the gain
potentiometer the output is adjusted to +20 mA.
This gives a maximum full-scale input of +16 mV.
INSTRUCTION MANUAL CT 24
CALIBRATION PROCEDURE
in the CT 24 to the
S
19
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