Vaisala DRYCAP DMT143 - Startup Sequence; Alarm LED

Normal output Normal output
2 s
Output frozen
40 s 3 ... 6 min
Time
Purge*
3 min
Autocal**
<3 min
* Purge will repeat every 24 hours (12-hour default purge interval for
DMT143L variant with DRYCAP® 180S if used with purge)
** Autocal will repeat every 60 minutes (postponed if environment is not suitable)
Startup
Figure 5 DMT143 Startup Sequence
The transmitter always performs this sequence when starting up. Keep the
transmitter continuously powered to optimize its measurement performance and
availability.
The DMT143L variant with DRYCAPâ 180S sensor can be used as a replacement
of the DMT242 transmitter and ordered without the purge functionality. If you use
purge with the DMT143L variant with DRYCAPâ 180S, the default purge interval is
12 hours.
3.3 Alarm LED
The alarm LED at the back of the transmitter provides a visual indication of the transmitter's
status. The alarm LED functionality is preset at the factory according to order form. You can
configure it as follows:
• You can use Vaisala Insight software or the ALARM command on the serial line to change
the alarm limit, enable/disable the dew point alarm, or turn on/o the LED completely.
• You can change the alarm limit using the DM70 handheld dew point meter.
Table 4 Alarm LED States
LED Color Meaning
Not lit Power o or LED functionality disabled.
Green Power on, normal measurement.
Green and blinking Purge or autocalibration in progress, measurement frozen.
Red Dew point above limit.
Red and blinking Transmitter error.
DMT143 User Guide M211435EN-J
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