Chapter 5 ________________________________________________________ Serial Line Operation
VAISALA ________________________________________________________________________ 39
The following example shows that a high limit alarm has been enabled
for channel 1. If the measured value rises above the -40.00 °C T
d
limit,
analog channel 1 is set to 5 V (Limit Hi = -40.00, Level Hi = 5.00). The
malfunction alarm (aerr) is disabled for both channels.
alarm ?
Channel 1:
Low Limit : OFF
High Limit : ON
Aerr : OFF
Quantity : Tdf
Limit Lo : 0.00
Limit Hi : -40.00
Hysteresis : 0.00
Level Lo : 0.00
Level Hi : 5.00
Channel 2:
Low Limit : OFF
High Limit : OFF
Aerr : OFF
Quantity : ppm
Limit Lo : 0.00
Limit Hi : 0.00
Hysteresis : 0.00
Level Lo : 0.00
Level Hi : 0.00
NOTE
Avoid enabling more than one alarm type for a channel.
Purge Status Alarm
The transmitter can temporarily freeze the output when measurement is
not possible (for example, during sensor purge). The purge status alarm
indicates this state by setting the analog output at a defined level, in the
same way as the limit alarm (see page 38).
Use the STATUS command to enable/disable the alarm and to define the
voltage/current levels (see example below). The channel is set to the
value of Level Hi when sensor purge is active and to Level Lo during
normal operation. During auto-calibration, the output is not frozen, that
is, the output of the purge status alarm is on Level Lo.
STATUS<cr>
The following example shows the purge status alarm enabled for
channel 1:
status
Channel 1:
Status : ON ?
To Next Page
Loading...
Need help?
General
