Instruction manual

2.0 SPECIFICATIONS SM425 INSTRUCTION MANUAL
< Pressure setting for the auxiliary ejector for high-temperature use >
Pressure supply for the auxiliary ejector should be set to a measured gas flow of approximately 5 l/min.
To set this, proceed as follows: (refer to Figure 2-12)
1. In Graph 4, draw a horizontal line from the 5 l/min point on the vertical axis (Suction flow: Qg)
toward the gas pressure line to be used, to find the point of intersection.
2. Draw a line vertically down from the point of intersection to the axis to find the drive pressure, P
(at the ejector entrance).
3. In Graph 1, determine Po (pressure setting) from L (the distance between the ejector and the
pressure gauge).
4. Open the needle valve to supply air for the ejector to the pressure gauge until it indicates the
pressure setting, Po.
Qg (the suction flow) may require change according to the conditions of use. Refer to Section 1.11.2 and
Section 1.18.4 for details.
Graph explanation (Figure 2-12)
1. Graph 1 is to compensate for pressure loss in piping between the ejector and the pressure
gauge, and find Po (pressure setting).
2. Graph 2 shows correlation between P (drive pressure) and Qa (air consumption).
3. Graph 3 shows correlation between P (drive pressure) and Pg (suction pressure; when the
measured gas inlet of the ejector is closed).
4. Graph 4 shows correlation between P (drive pressure) and Qg (suction flow) for each gas
pressure.
42500001 REV A 33