Oxygen Monitor SGM7 8 Operation
HB_SGM7_eng.docx
21
8 Operation and parametrization
8.1 Operation
8.1.1 Switch-on and measurement indication
When the oxygen monitor is in operating state and all lines are connected
according to chapter 7.2, the SGM7 can be switched on. The measuring cell
reaches its operating temperature of 750 °C after approx. 10 minutes. The
current measuring value is displayed but only reaches the indicated error
limits after an hour when the thermal conditions in the measuring cell are
even.
After switch-on the SGM7 is in display mode. On the display the programmed
measuring value for output 1 is shown (normally the oxygen concentration)
according to the chosen dimension.
8.1.2 Gas flow adjustment
For exact measurings a flow rate of 5 to 10 l/h has to be ensured. For
measurings via bypass the flow rate is realized by an internal pump.
For excess pressure of the measuring gas the manufacturer recommends
the installation of a high-quality needle valve. Appropriate needle valves can
be delivered by the manufacturer of the SGM7. For higher pressures of the
measuring gas an
additional
pressure regulator is recommended which
adjusts a pressure of approx. 100 kPa (1 bar)
excess pressure
.
8.1.3 Data monitoring
The SGM7 can be programmed with a limit value. The relevant messages
are delivered via relay output. The relay is open in active state (This state is
displayed in the status line). The signalization is delayed. The response time
can be adjusted for the data monitoring (limit value delay time) between 1
and 99 seconds.
NOTE
