Vaisala HUMICAP MMT162 Uživatelská příručka stáhnout pdf (Strana 23)

Chapter 4 _________________________________________________________________ Operation

VAISALA ________________________________________________________________________ 21

Normal Operation Mode and Malfunction

Alarm

In the normal operation mode, a channel outputs voltage or current that

corresponds to the reading of the selected parameter.

If the transmitter is malfunctioning, the channel output is set to a pre-

defined level. This level can be changed using the AERR command; see

page 35.

NOTE

The malfunction alarm

overrides the limit alarm mode. If the transmitter

is malfunctioning, the analog outputs are set to the levels specified with

the

AERR command, unless the malfunction prevents the outputs from

being controlled.

Limit Alarm

The limit alarm is activated when the measured parameter goes below the

low limit, or above the high limit. The alarm levels and limits are

configurable using the ALARM command (see page 36). By default, the

alarm levels are set as follows:

- For current output, an active alarm is indicated by the current being

at the maximum of the scale (20 mA).

- For voltage output, an active alarm is indicated by the voltage being

at the maximum of the selected scale. For example, if the voltage

output scale is 0 … 5 V, an output of 5 V indicates the alarm is active.

- For LED alarm, an active alarm is indicated by a lit LED. When the

alarm status is low, the LED is not lit. If the transmitter is

malfunctioning or it cannot measure for some reason, this causes the

LED to blink at 0.5 Hz frequency.

LED alarm indicator is integrated to a LED cable (Vaisala item

MP300LEDCBL) that can be ordered and used instead of a regular

connection cable.

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Vaisala HUMICAP MMT162 Uživatelská příručka Strana 23