CARLO GAVAZZI MDI 40 TF - CONFIGURATION SOFTWARE Manuel d'utilisateur télécharger pdf (Page 22)

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NOTE: the hysteresis is to be programmed according to the displayed

range.

oF.d : value expressed in seconds of the time delay at the alarm set-

point’s deactivation (OFF).

Value to be programmed within the range:0 < oF.d < 255.

This delay can be useful when it is necessary to guarantee the alarm

output activation for a sufficiently long time which is to be acquired by the

processing system connected downstream MDI40.

on.d : value expressed in seconds of the time delay at the alarm set-

point’s activation (ON). This value is to be programmed within the range:

0 < on.d < 255.

This value can be useful when it is necessary to avoid the alarm set-

point’s activation if the alarm duration is not long enough. Example: when

the pressure to be measured decreases very quickly because of air

bubbles, but this is not a danger for the monitored plant.

RLY : normal status of the relay coil.

nd : normally de-energized coil.

nE : normally energized coil.

FiL : menu to program the digital filter’s parameters.

This function allows you to solve two different kinds of problems:

• stabilize the value of the instantaneous measurement displayed by

MDI40 when the value is not enough stable from the beginning and will

not therefore allow either a clear reading on the display or a good control

by the alarm set-points;

• allow an amplitude of the displayed scale as regards to the electrical

one >2.

An example of how the electrical scale is to be used can be the

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CARLO GAVAZZI MDI 40 TF - CONFIGURATION SOFTWARE Manuel d'utilisateur Page 22