Vaisala DRYCAP DMT143 Uživatelská příručka stáhnout pdf (Strana 19)

Chapter 3 _______________________________________________________ Functional Description

VAISALA ________________________________________________________________________ 17

DMT143 Startup Sequence

When the transmitter is powered up, it will perform the sequence

(applicable from software version 1.1.5 onward) shown in Figure 4

below. After a two-second startup, the transmitter will measure normally

for forty seconds, after which it will perform the sensor purge and auto-

calibration functions. This can take up to five 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 six

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.

1401-033

Figure 4 DMT143 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

2 s

utput frozen

40 s 3 ... 5 min

Time

Purge*

3 min

Autocal**

<2 min

* Purge will repeat every 24 hours

** Autocal will repeat every 60 minutes (is postponed if environment is not suitable)

Startup

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Vaisala DRYCAP DMT143 Uživatelská příručka Strana 19