396-4519Y1 Sentinel NH3 Blockage Monitor
26
Revised 01/26/2022
© 2016-2022 SurePoint Ag Systems Inc.
D
Setup &
Operation
Sentinel Operation
Once the Sentinel has been set up in the display, little is required of the user to operate the
Sentinel. The system is designed to run in the background and only alert you if there is a
problem. As previously mentioned, the HOME screen yields a quick snapshot of row-to-row
comparisons while the row detail report gives more specific information about each row.
From the HOME screen, when the temperature for a
row or rows goes outside the set tolerance, the row
will display red in the bar chart.
Anhydrous at the tank is under pressure and at a
higher temperature than at the bottom of the
knife. Anhydrous is colder at the bottom of the knife
because the pressure is lower where the anhydrous
is exiting the plumbing system. If the bar
temporarily goes down (lower temperature than
average) and then gradually gets warmer than the
average, typically the plug will be before the sensor.
This happens because the remaining anhydrous in
the line is no longer under pressure from the
manifold and the line cools because of the boiling
off of the anhydrous. The sensor will eventually
warm up because of the extended period of no
flow.
If the bar goes up, typically the plug would be after the sensor. NH3 would be under pressure because of the
plugged knife and unable to bleed off. This higher pressure and no flow would cause the sensor to be
warmer.
A broken hose/ knife can also cause the bar to go down. A broken NH3 hose can cause an overflow of
anhydrous to go to that broken line, making that line sensor colder than the others.
If a row falls outside the set tolerance, a full page
alarm is displayed. The length of time from when the
row shows a problem to when this alarm is displayed
is determined by the
ALARM TIME
previously set.
This page will close automatically based on the
AUTO
HIDE
time previously set.
From the HOME screen, touching the row detail
button will display the row detail page. The user
can toggle through the rows by touching the
<
>
buttons. The user can also pause the
Auto
Scrolling
feature pressing the
Pause Scan
button.
Watch this Home Screen to get an idea of where the Tolerance should be set. If the Tolerance is too low, you
will get false alarms. If it is too high, it will take longer to alarm if there is a problem. You may be able to set
the Tolerance to 10 or less.
Sentinel HOME Screen
Row Detail Page
Row Detail Button
ALARM Screen
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