CODEL
OPS. 141
21
Issue : A
Revision : 1
Date : 14/06/18
Doc i/d :
0118/6
050028
10-second, 10-minute, 1-hour and 30-day rolling averages are set-
up.
•
Output 1
The analogue output (4 - 20mA) represents Ringelmann 0 to 5,
with a fast response time 10 seconds. Also, should a system fault
occur, the instrument will still attempt to measure the Ringelmann
value.
•
Parameters
As the instrument is not being used as part of an integrated
system, the device identity is not required.
The 1hour rolling average is used to provide an alarm at
Ringelmann 2, where the change-over contact relay will operate.
Neither a pathlength, nor a dust factor are required for the
calculation of a Ringelmann value.
The plant is in continuous operation so the auto zero facility
cannot be used.
•
Normalising
Normalising parameters are not required for the calculation of a
Ringelmann value.
3.7.3. Example 2 : Dust Monitor
The parameters shown below illustrate some typical settings to use the
instrument as a dust monitor, as part of an integrated system. The salient
settings are described below :
•
Averages
30-second, 10-minute, 1-hour and 7-day rolling averages are set-
up.
•
Output 1
The analogue output (4 - 20mA) represents 0 to 250mg/Nm
3
, and
is a 1-hour rolling average. Should a system fault occur, the
instrument will drive the analogue output full scale.
