Akytec ITP11 Manuel de l'utilisateur - Page 7

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Installation and operation

5.1

Installation

The device is designed for switch panel mounting in a borehole of Ø22.5 mm (see Appendix A for dimen-

sional drawings).

Carefully position the supplied gasket on the display rear surface. Insert the cylindrical part of the device into

the borehole and tighten the nut from the rear side of the switch panel. Connect the device to the signal ca-

ble in accordance with Appendix B.

The device factory settings can be changed before assembly if necessary. For this purpose the display must

be connected to a standard signal 4-20 mA.

5.2

Operating mode

The operating mode is automatically switched on if the standard signal 4-20 mA is connected to the termi-

nals.

The input signal is digitalised, the square root calculated (if the function is enabled) and the signal according-

ly to the set parameters calibrated and displayed. The scale factor is calculated based on the parameter

di.Lo "lower limit" (according to input signal 4 mA) and di.Hi "upper limit" (according to input signal 20 mA).

If the input signal is lower than 3.8 mA, the error message Lo is displayed.

If the input signal is higher than 22.5 mA, the error message Hi is displayed.

Square root function

This function is intended for transmitters with square characteristic curve. To enable the function, the param-

eter Sqrt must be set to ON.

Damping function

Undesirable signal fluctuations can be suppressed through the adjustable filter constant.

The most important feature of the exponential filters is

3 and Table 5.1).

If the constant increases, the display reacts to changes of the input signal more slowly and the susceptibility

to interference is lower.

akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover· Germany · Tel.: +49 (0) 511 16 59 672-0 · www.akytec.de

Panel

Gasket

Nut

Body

Fig. 2 Mounting

– the filter time constant (parameter td) (see Fig.