Instruction manual

10.0 OTHER FUNCTIONS SM425 INSTRUCTION MANUAL
42500001 REV A 171
Figure 10-17 Manual Calibration Display
1. Turn the gas cylinder valve regulator fully clockwise by hand.
2. Adjust the flow rate to 600 ± 60 ml/min (the flow indicating ball stops floating on the green line
when the valve is slowly opened) by turning the regulator valve back slowly counterclockwise and
monitoring the flow indicating ball.
3. Select Valve opened (to start calibration) 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 10-18. Immediately
stop the zero-gas flow. Turn the zero-gas valve regulator fully clockwise.
Figure 10-18 Zero-gas Calibration Complete (in Manual Calibration Display)
With a calibration time of four minutes, each gas cylinder can be used for two zero-point calibrations.
<Completion of calibration>
1. Fully close the needle valve mounted on the calibration gas inlet of the detector.
2. Remove the tube connecting the detector to the standard gas unit.