Ametek Land 4750-PM, Руководство пользователя

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5 - 9 User Guide
Particulate Measurement System 4750-PM
5.3.3 Emission Alarm Status [ALA1, ALA2]
The alarm settings menus [ALA1, ALA2] are used to set up emission alarms
used to activate two alarm relays in the sensor. The ALA1 menu corresponds
to Relay 1 and ALA2 corresponds to Relay 2. Both channels use the value
from the display to generate alarms.
Alarm Set Points [SP1, SP2]
The two alarms can be set using different set points to define a Warning
(High) and a Limit (High High) Alarm level. It is recommended to set the
Limit alarm to your local regulatory compliance emission limit.
Optionally, set the Warning alarm to a lower value to give early warning of a
potential problem.
•
To disable either alarm, set the relevant Set Point value to 0000
(disabled).
• The default Set Point values are ‘000’ (i.e. not set).
Alarm Delay [DEL1, DEL2]
The alarm delays are used to prevent temporary, high dust spikes from
generating unnecessary alarms. Dust spikes are typically generated on
process start-up or during bag-filter cleaning. The default delay is 5 seconds.
Increase this as required to adapt it to the duration of the dust spikes
displayed.
NOTES
(i) Different alarm delays can be set on the two alarms. Averaging
is done using an historical walking window filter. This means
the average values used to generate alarms may differ from
the average logged data, which uses simple averaging.
(ii) On power-up complete the adjusting the settings, then press
the RESET button to reset the averaging filters. During the
initial period readings will be an average of a shorter period
than the averaging time. This may result in unwanted alarms
Changing the Alarm Settings for Relay 1 [ALA1]
1. Scroll DOWN to the ALA1 (alarm 1) menu, then press RIGHT to display
SP1 (set point 1).
2. Press RIGHT again to display the current set point value (default: 100 ).
3. Use the UP/DOWN buttons to change the value. Press RIGHT to move to
the next digit.
4. When complete, press RIGHT. The display now shows DEL1 (delay 1).
5. Press RIGHT again to display the alarm/ ALA 1 delay (default: 5 secs =
0005 ).
6. Use the UP/DOWN buttons to change the value. Press RIGHT to move to
the next digit.
7. When complete, press RIGHT to return to the main menu.