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Chapter 3 _______________________________________________________ Functional Description
DMT143 Startup Sequence
NOTE
VAISALA ________________________________________________________________________ 17
When the transmitter is powered up, it will perform the sequence shown
in Figure 4 below. After a two-second startup, the transmitter will
measure normally for five minutes, after which it will perform the sensor
purge and auto-calibration functions. This can take up to six minutes,
during which time the output is frozen: it will display the last measured
values before the sensor purge began.
The auto-calibration function may be postponed if the measurement
environment is not suitable. For example, the environment may be
changing rapidly or have too high humidity.
Normal operation and output is typically achieved no later than 11
minutes after startup. The sensor purge will repeat every 24 hours, and
auto-calibration every hour. The output will again be frozen for their
duration.
Startup
Normal output
2 s
5 min
* Purge will repeat every 24 hours
** Autocal will repeat every 60 minutes (is postponed if environment is not suitable)
Figure 4
DMT143 Startup Sequence
The transmitter always performs this sequence when starting up. Keep
the transmitter continuously powered to optimize its measurement
performance and availability.
Purge*
Autocal**
3 ... 4 min
<2 min
Output frozen
3 ... 6 min
Normal output
Time
1202-115
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