User guide

EDS - RK90R - OPTICAL BEAM SMOKE DETECTOR - USER GUIDE

• if the signal overcomes 4 V, the blue Led flashes faster and faster as the frequency signal increases up

to 4,7V

• when the signal overcomes the 4,7V and in the range 4,7V - 4,9V, the blue led is continously ON.

This is the position of optimal setup

• if the signal gets over 4,9V the two blue and red leds are permanently on. This is the saturation

indication.

The table of fig.8 recaps the leds operation.

8.14 - install the cover of the TX

8.15 - after closing the cover of the TX and performing the operations of fine optical alignment using

the multimeter, the STS01 meter or the indications of the leds, adjust the output signal on the RX to a

level between 4,7-4,9V, slowly turning the trimmer P1.

When the signal is in this range, the blue led is continously on.

This is the signal level of optimal setup. If the signal rises to 5V the detector gets in saturation and the

blue and red leds are both on.

It is necessary to decrease the signal to 4,7-4,9V acting on P1so that the red led turns off and only the

blue one remains on (to avoid saturation).

Attention! - this regulation is not critical. The procedure above indicated it is that optimal, however

it is enough that the blue Led is flashing or stably ON to have one good setting. It is necessary yet

to avoid the saturation (red Led ON). The microprocessor automatically compensates the

inaccuracies

of the setting.

8.16 - select the alarm threshold level of the circuit sensible to obscuration acting on the selector SW2

with the following possible choiches :

• position 1 - low sensitivity - obscuration alarm threshold set to 70%

• position 2 - low to medium sensitivity - obscuration alarm threshold set to 60%

• position 3 - medium to high sensitivity - obscuration alarm threshold set to 50%

• position 4 - high sensitivity - obscuration alarm threshold set to 40%

8.17 - sensitivity must be regulated according to the environmental situation. The setting must normally

be a medium sensitivity level, but in case of dusty and perturbed environments it will be useful to set

a lower sensitivity level.