Vaisala PTU300 - Manual (Page 81)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 79
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 tables on page 22. 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, chemical purge).
quantity2 = Quantity for display alarm 2. Options are the same as for
quantity1.
Example (view current display alarm settings):
>alsel ?
Al1 P above: - ?
Al1 P below: 1013.00 hPa ?
Al1 P hyst : 10.00 hPa ?
Al1 P enabl: ON ?
Al2 T above: 40.00 'C ?
Al2 T below: - ?
Al2 T hyst : 1.00 'C ?
Al2 T enabl: OFF ?
Warning! One or more alarms disabled.
>
Table 15 ALSEL Parameters
Name Description
above If specified, the alarm goes off when the quantity value rises above
the exact value of this setpoint. However, if above < below, the
alarm goes off at (above + hyst) and (below – hyst) instead.
Cannot be set for fault and online alarms.
below If specified, the alarm goes off when the quantity value decreases
below the exact value of this setpoint. However, if above < below,
the alarm goes off at (above + hyst) and (below – hyst) instead.
Cannot be set for fault and online alarms.
hyst Distance from setpoint amount of extra retractment needed in order
to regenerate alarm on the next crossing of the setpoint.
Cannot be set for fault and online alarms.
enabl Enable (ON) or disable (OFF) the display alarm.