The USHK-03 devices are designed to monitor the presence of voltage in fire and intruder alarm loops or power supply lines, thus they allow to distinguish between the presence of alternating (for example, standby mode in PPK-2, PPK-2M loops) and unipolar (for example, Fire mode in PPK-2, PPK-2M loops) voltage in the monitored lines. The USHK-03 device provides control over the voltage form in the loop and, in case of presence of alternating voltage with the parameters of polarity reversal with the duration up to 100 ms and frequency from four to twenty, generates optical pulses of green (yellow) colour.
At unipolar voltage in the loop the generator generates optical pulses of red (orange) colour. A jumper installed between pins "1" and "2" of the output block allows the generator to generate optical pulses of green (yellow) colour irrespective of the voltage form in the loop.
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