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Outputs and Alarm
Alarm
In addition to an audible alarm, there is a single alarm switched FET that
will enable the yellow beacon on top of the ADR-1500 case. Normally, the
Description and
switched alarm output is OPEN with respect to ground. During an alarm
condition, this output is switched to ground (Rout < 0.1 ). Whenever the
Operation
alarm is triggered, the on-board sound will be activated. The alarm
function can be enabled or disabled and the alarm level (trigger threshold)
can be selected by the user through the ADR-1500 keyboard. The alarm is
triggered whenever the selected alarm level is exceeded.
In addition to the audible and beacon alarms, an optional two-pole 30A
alarm relay is provided for external process control (e.g., vent/fan
switching). This relay assembly can be accessed through the side liquid
tight cord gland and provides normally open and normally closed contacts.
When the displayed concentration falls below that level the alarm condition
stops. While the alarm is on, the user can disable it momentarily by
pressing any key on the ADR-1500. If the concentration continues to
exceed the set alarm level after 10 seconds, the alarm condition will be
reactivated.
Thermo Fisher Scientific
MIE ADR-1500 Instruction Manual
7-3
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Troubleshooting
