Vaisala DMT340 - Manual (Page 81)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 79
When modifying the value, use the arrow up and down buttons to
change the value under the cursor. Left and right arrow buttons
move the cursor. Select the OK button to accept the modified
value, or Cancel to undo the modification.
6. Set a suitable Hysteresis value to prevent the alarm from being
triggered unnecessarily by small measurement changes that pass
the alarm limit repeatedly.
7. Set or clear the Alarm enable checkbox to enable or disable the
alarm.
8. Press the Exit button to leave the alarm configuration screen and
return to the basic view.
Using Serial Line
Use the serial line command ALSEL to view or set the display alarms.
ALSEL [quantity1 quantity2]
where
quantity1 = Quantity for display alarm 1. You can set any quantity
available on your transmitter; see Table 2 on page 18 and
Table 3 on page 18. In addition to quantities, you can also
select the following:
FAULT – Alarm for device errors
ONLINE – Alarm for sensor operations that freeze the
measurement output (for example, sensor purge).
quantity2 = Quantity for display alarm 2. Options are the same as for
quantity1.
Example (view current display alarm settings):
>alsel ?
Al1 Tdf above: 0.00 'C
Al1 Tdf below: -
Al1 Tdf hyst : 1.00 'C
Al1 Tdf enabl: ON
Al2 T above: 40.00 'C
Al2 T below: -
Al2 T hyst : 1.00 'C
Al2 T enabl: ON
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