CODEL
OPS. 141 22
Issue : A
Revision : 1
Date : 14/06/18
Doc i/d : 0141/6
050028
• Parameters
As the instrument is being used as part of an integrated system,
the device identity has been set to 4. This value must be unique
from other monitors in the system.
The 1-hour rolling average is also being used to provide an alarm
at 50 mg/Nm
3
, where the change-over contact relay will operate.
A dust factor has been estimated at 5000 (2500/0.5m) until iso-
kinetic sampling can be conducted.
The plant is shut down daily, so the auto zero facility can be used
to reset the zero of the instrument during these periods of
inactivity. This value should be set as low as possible. 1%/day
should be set initially, then if window fouling still causes a
problem, increase this figure.
• Normalising
The data is being normalised to standard conditions, 0
o
C, 3%
oxygen, 101kPa pressure.
Normalising data for oxygen and pressure is relatively constant
(11% and 104kPa respectively) and each is entered into the
instrument via the keypad.
The temperature within the duct, however, is variable, and is being
measured with a transducer that provides a 4 to 20mA output
proportional to 0 to 400
o
C.
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