Instruction manual

SM425 INSTRUCTION MANUAL 7.0 STARTUP
8. After the zero gas flow has been established, select “Valve opened” as shown in Figure 7-29. An
oxygen-concentration trend graph screen appears (see Figure 7-30). The CAL TIME in the
bottom area of the panel flashes. Observe the trend graph and wait until the measured value
stabilizes in the vicinity of the zero-gas concentration on the graph. The graph shows the
concentration before calibration, so the value may not be correct at this point.
Figure 7-30 Manual Calibration Trend Graph
9. After the measured value has stabilized, press the [Enter] key to display the “zero-calibration
complete” display screen shown in Figure 7-31. At this point, the measured value is corrected to
the zero-gas concentration. Close the zero-gas flow valve. The valve lock-nut should be tightened
completely to prevent the zero gas from leaking.
Figure 7-31 Zero Calibration Complete Display
10. Select End in the display screen as shown in Figure 7-31. An oxygen concentration trend graph
screen appears and “HOLD TIME” flashes. This time is referred to as the output-stabilization
time. If the HOLD TIME has been selected in the output-hold configuration, the analog output is
held (refer to Section 1.46, “Setting Output Hold”). Manual calibration is completed when the
preset output-stabilization time elapses. This output-stabilization time is set to 10 minutes at the
factory before shipment. If the [Enter] or [Return] keys are selected during the output-stabilization
time, manual calibration is completed and the analyzer returns to process monitoring.
118 42500001 REV A