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6.6 Automatic setup
To be able to detect variations in dust flow, and to set the alarm so that it will
go off if there is excessive dust flow, you must determine the typical dust
flow in the application when the process is operating normally.
The unit has an AUTOMATIC SETUP function. With this, you can set the
measuring range of the dust monitor so that a typical dust flow in the
application corresponds to 20% of the emission monitor output full scale. The
4…20 mA output at the typical dust flow rate will then be 4 mA + 20% of 16 mA
(20 mA– 4 mA) which equals to 7.2 mA. If the dust flow rate is 5 times the
typical value or higher, the output will be 20 mA, and if the dust flow rate is
zero, the output will be 4 mA.
For AUTOMATIC SETUP you need to know that the process is running with a
normal dust flow rate. Then remove the cover of the unit, and initiate
AUTOMATIC SETUP by pressing the small button near the indicator lamp, on
the lower printed circuit board (see Figure 9). NOTE: the indicator lamp must
be green before you press the key.
The unit starts collecting dust flow data. This takes from about one hour
(typically 40-60 minutes). The three digit display counts down to zero, and the
indicator lamp remains red as long as data are being collected. To avoid
interference from background electrical noise, you should replace the cover of
the unit after having initiated the AUTOMATIC SETUP. After an hour, the setup
is ready and the unit returns to normal operation. If your environment is not
electrically noisy, you may check the indicator lamp. It will turn to green, when
setup is ready.
NOTE ! MODEL S305: Automatic setup procedure can be started
only in service mode. PIN code required.
MODEL S304: Automatic setup procedure can be started
by pressing auto setup button. PIN code is not required.
See also chapter about manual range setup.
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