Akytec ITP11 Руководство пользователя - Страница 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 Ap-

pendix A for dimensional 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 cable in accordance with Appendix B.

The device factory settings can be changed before assembly if necessary. For this pur-

pose 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 con-

nected to the terminals.

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

the signal accordingly 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 parameter 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

rameter td) (see Fig. 5.2 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

Fig. 5.1 Mounting

d – the filter time constant (pa-