Part 3 Operation
3.3
Advanced Alarm Functions
The OMD-501D Trace Oxygen Analyzer is equiped with 2
advanced relay contact alarms. These alarms can be configured
as normally open or normally closed, ha
s
a delay model built-in
and can be enabled or disabled when necessary. Using the color
display, the alarms are also color coded. When not engaged,
the alarms are shown in GREEN, when engaged the alarms are
visible in RED - As seen in the picture to the right.
The alarms are rated at 5A @ 230VAC. If you are connecting to solenoid valves or a pump whose cur-
rent can fluctuate greatly, it is adviseable to use a slave relay to ensure no damage occurs to the analyzer.
Setting Alarm 1 and Alarm 2 is identical to begin
.
G
o ahead and
move the cursor to the alarm configuration you want to adjust using
the UP / DOWN keys in the analyzer MENU and press ENTER.
To adjust the value setpoint of ALARM1 simply move the cursor up /
down to select ADJUST ALARM 1 and press ENT. You will be
prom
p
ted
to select a PPM or Percent value based on your alarm set
point. Press
ENT once selected. From here
,
you can use the UP /
DOWN arrows
to adjust each digit which is highlighted in red. Simply
hit the enter button to move the cursor over.
The alarm function allows the user to set the alarm to trigger the relay
contacts as a HIGH alarm or as a LOW alarm. Simply open the ALARM1
menu and SET HIGH / LOW to meet your process requirements.
The alarm has a built in DELAY mode. This is a nice feature to use if you
are working on your process and do not want to have the alarm relay
contacts trip. You will set this in a similar fashion to setting the alarm.
The DELAY mode is in minutes, so adjust the value accordingly.
The alarm can also be enabled / disabled should it be hooked up but
not required. Move the cursor using the UP / DOWN keys to the
ENABLE / DISABLE and select the ENTER key.
The alarms can function as normally open or normally closed. This
selection will be choosen when hooking up the rear wiring. It is not
completed through the software. See the wiring diagram in section 2.4
for more information.
If any questions about the ALARM functions should arise, please contact
the factory for assistance or technical questions.
