Moreover, the Ext.1 socket (pin 8) provides a control signal for synchronizing
connected devices with the measuring cycle of the AlphaGUARD. This control
signal is triggered each time after finishing a measuring cycle for 1 ms to "High"
(+3,3 V). During the remaining time of an ongoing measuring cycle the control
signal is "Low" (r0 V).
Mains power support and alarm output
For the connection of the mains power supply with 10 … 32 VDC.
When exceeding the free settable alarm threshold, an alarm
output signal is given via the socket of the mains power supply.
With a small Alarm Outbreak Box (optional accessory) the two
alarm signals can be extracted:
Alarm high signal (switch to supply voltage, open emitter):
x No Alarm: switch opened (high-impedance)
x
Alarm: switch closed (connected to power supply), max.
100 mA
Alarm low signal (switch to ground, open collector):
x No Alarm: switch opened (high-impedance)
x Alarm: switch closed (connected to ground), max 100 mA
With the Switch Box (part of the Alarm Outbreak Box), the alarm
output signal can directly be used to switch on an external 220 V
device (e.g. ventilation system).
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