9023927 - 2nd edition - May 2007
Page 45 of 72 Pages
The menu » Settings «
Alarm / Relay settings
Alarms can be output via a relay and a digital interface if a relay module is installed.
This group contains the setting functions for the alarms.
– Alarm on/off
— This function is used to enable and disable alarm monitoring.
●
Select the menu items » Settings «, » Instrument «, » Alarm « and » Alarm on/off «
in this order, pressing the »
« key after each selection.
●
Select » Enable « or » Disable « and press the »
« key to activate it.
– Set alarm A1
— This function is used to change the alarm configuration for alarm A1.
●
Select the menu items » Settings «, » Instrument «, » Alarm « and « Alarm A1 « in
this order, pressing the »
« key after each selection.
●
Use the »
« and »
« keys to set each position of the threshold value for
the alarm A1 and press the »
« key to confirm the setting.
●
Press the »
« key to confirm the complete alarm threshold value. The setting
for the alarm threshold A1 is displayed.
— The function for setting the alarm direction is opened.
●
Select » Rising « or » Falling « and press the »
« key to activate your selection.
●
Select » Next « and press the »
« key.
— The function for setting the self-hold function of the A1 alarm is opened.
●
Select » Latching « or » Non latching « and press the »
« key to activate it.
●
Select » Next « and press the »
« key.
— The function for setting the A1 acknowledgement is opened.
●
Select » Can be acknowledged « or » Cannot be acknowledged « and press the
»
« key to activate it.
— The function for setting the A1 hysteresis is opened.
This function allows the user to set a bandwidth in which a tripped relay stays in
its status until the gas concentration is outside this bandwidth. With this function
relays will not "chatter" at the alarm set point. E.g. A1 set point is 40 ppm, hyster-
esis is set to 3 ppm. alarm A1 will come on at 40 ppm and will stay active until the
concentration falls below 37 ppm.
●
Select the line for input of the hysteresis and press the »
« key to switch to
edit mode.
Attention:
If the alarm is disabled, no alarms will be signalled via the relay or the
HART interface!
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