Vaisala DPT145 - Manual (Page 20)

User's Guide _______________________________________________________________________
20 ___________________________________________________________________ M211371EN-D
DPT145 Start-up Sequence
When the transmitter is powered up, it will perform the sequence shown
in Figure 5 below. After a five-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.
Normal operation and output is typically achieved no later than 11
minutes after startup. The sensor purge will repeat every 12 hours, and
auto-calibration every hour. The output will again be frozen for their
duration.
1108-033
Figure 5 DPT145 Startup Sequence
NOTE The transmitter always performs this sequence when starting up. Keep
the transmitter continuously powered to optimize its measurement
performance and availability.
Normal output Normal output
5 s
Output frozen
5 min 3 ... 6 min
Time
Purge*
3 ... 4 min
Autocal**
<2 min
* Purge will repeat every 12 hours
** Autocal will repeat every 60 minutes (is postponed if environment is not suitable)
Startup