CARLO GAVAZZI MDI 40 TF - CONFIGURATION SOFTWARE Manual de usuario descargar pdf (Pagina 23)

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measurement of a process signal from a transmitter: 0 to 20mA, 4 to

20mA, 0 to 10V, 0 to 5V, 1 to 5V and so on which can correspond to a

pressure, humidity, temperature, etc. In this case the measured signal

managed by the electrical scale (see “Lo.E”, “Hi.E”) has a numerical

value which is completely different from the one of the displayed scale

(see “Lo”, “Hi”).

Fi.S : activation range of the digital filter. This value is programmable

within the range: 0 < Fi.S < 3999.

The programmable numerical value represents the fluctuation range of

the value which has been measured and displayed by MDI40. In the first

configuration phase this value must be 0 and the right value is to be

entered only after the verification of the possible fluctuation.

Example: the measured instantaneous value varies from 1204 to 1210,

and the value to be entered as “Fi.S” is 6 (1210 - 1204).

Fi.C : value of the filtering coefficient. Value to be programmed within

the range: 1 < Fi.C < 255.

The higher “Fi.C”, the higher the filtering of the measured value and the

longer the updating time of the displayed value, the alarm set-points and

the analogue retransmission.

NOTE: for a correct working of the filter, the relative coefficient must

satisfy the following relationship: 1 < Fi.C < (Fi.S x 8) < 255.

Example: in order to display a temperature with a resolution of 0.1°C, set

“Lo.E”=-20°C ⇒ “Lo”=-20.0°C, “Hi.E”=200°C ⇒ “Hi”=200.0°C. In this

case the scaling amplitude will be 10 times wider with an clear fluctuation

of the value displayed in the measuring phase. In order to stabilize the

value it is necessary the parameters “Fi.S” and “Fi.C”. The value

fluctuates of 0.5°C max., therefore “Fi.S”=0.5 and the filtering coefficient

Gross Automation (877) 268-3700 · www.carlogavazzisales.com · [email protected]

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CARLO GAVAZZI MDI 40 TF - CONFIGURATION SOFTWARE Manual de usuario Pagina 23