Instruction manual

10.0 OTHER FUNCTIONS SM425 INSTRUCTION MANUAL
1. When the display screen as shown in Figure 10-19 during calibration, open the zero gas flow
setting valve and adjust the flow rate to 600 ± 60 ml/min. To rotate the valve shaft, loosen any
lock nut and slowly turn it counterclockwise. Monitor the flow rate using the calibration gas
flowmeter.
2. Adjust the measurement gas pressure to obtain pressures listed in Table 10-7 ± 10%.
Table 10-7 Setting flow for high pressure (zero)
Figure 10-19 Manual Calibration Display
3. Adjust the flow rate and select Valve opened from the Manual calibration display screen. Check
the Trend Graph display screen to verify the measured value has stabilized. Then press the
[Enter] key. The Manual calibration display screen should appear as shown in Figure 10-20.
Figure 10-20 Zero-point Calibration Complete (in Manual Calibration)
4. Close the zero gas flow setting valve. Tighten any lock nut to prevent the leakage of the zero gas
into the sensor during process gas measurement.
10.6.4 Operation After Calibration
The analyzer does not require any special operation following calibration. It is recommended the pressure
regulator for the zero gas cylinders be closed between calibrations.
42500001 REV A 173