Introduction
Wire the high alarm and low alarm pins to supply simple on/off switching to operate equipment which requires only an on, or off signal, such as an alarm.
Note: All transistor outputs are open collector current sink. The maximum rating of these transistor outputs is 12VDC at 150mA. If you connect a relay or any other inductive load to the transistor outputs, a back EMF suppression diode must be fitted across the load.
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The external connector requires an RJ12 connector. The pin designations for the external output connector are numbered 1 to 6.
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1 = 12VDC (closest to the 12V DC power jack)
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2 = Analogue output 0-5V
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3 = Control
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4 = High alarm
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5 = Low alarm
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6 = Ground (furthest from the 12V DC power jack)
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The RJ12 connector offers two possibilities for wiring, either a switch to GND, or a switch to 12V output.
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To switch to 12V output, wire to pins:
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4 (High alarm) or 5 (Low alarm)
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1 (12VDC).
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If the 12V output is used, the power for the relay coil is supplied by the Aeroqual AC/DC adapter. In this case, make sure the relay coil doesn't draw more than 150 mA and that a protection diode is inserted across the relay coil.
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The shown diagram is a typical wiring for a high gas level alarm.
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Failure to insert a circuit protection diode may result in the circuit not working, and damage to the monitor if a voltage spike is created by the relay.
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To switch to GND, wire to pins:
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4 (High alarm) or 5 (Low alarm)
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6 (Ground).
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If the switch to GND output is used, make sure the relay coil doesn't draw more than 150 mA, that the voltage doesn't exceed 24V and that a protection diode is inserted with correct polarity across the relay coil.
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Wiring for alarm will only operate while the handheld monitor is powered by the supplied AC/DC adapter.
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For further support, contact Technical Support.
For further support, contact Technical Support.
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