Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 40)

<2. Specifications>
2-22
IM 11M12A01-02E 8th Edition : Jan.13,2012-00
2.7.3 Ejector Assembly for High Temperature (E7046EC,
E7046EN)
This ejector assembly is used where pressure of sample gas for high temperature detector is
negative. This ejector assembly consists of an ejector, a pressure gauge assembly and a needle
valve.
Standard Specifications
Ejector
Ejector Inlet Air Pressure: 29 to 68 kPa G
Air Consumption: Approx. 30 to 40 l/min
Suction gas flow rate: 3 to 7 l/min
Connection: Rc1/4, SUS304 (JIS)
Tube Connection: Φ 6 / Φ 4 mm or 1/4 inch copper tube (stainless tube)
Pressure Gauge Assembly
Type: A 1.6 3/8 x75 x100 kPa (JIS B7505)
Material in Contact with Gas: SUS316 (JIS)
Case Material: Aluminum alloy (Paint color; black)
Scale: 0 to 100 kPa G
Connection: R1/4 or 1/4NPT, SUS304 (JIS) (with Bushing G3/8 x R1/4 or
1/4NTP)
Needle Valve
Connection: Rc1/4 or 1/4FNPT
Material: SUS316 (JIS)
(Note) Pipe and connections are not provided.
Part No. Description
E7046EC Ejector; Ш6 / Ш4 TUBE joint, Pressure gauge; R1/4,
Needle valve; Rc1/4: SUS304 (JIS)
E7046EN Ejector; 1/4 TUBE joint, Pressure gauge; 1/4NPT,
Needle valve; 1/4FNPT : SUS304 (JIS)
< Pressure setting for the ejector assembly for high temperature use >
Pressure supply for the ejector assembly should be set so that the suction flow of the sample gas
becomes approximately 5 l/min.
To set this, proceed as follows:
(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.
Draw a line vertically down from the point of intersection to the axis to find the drive pressure,
P (at the ejector entrance).
(2) In Graph 1, determine Po (pressure setting) from L (the distance between the ejector and the
pressure gauge).
(3) Open the needle valve to supply air for the ejector to the pressure gauge until it indicates the
pressure setting, Po.
NOTE
Qg (the suction flow) may require change according to the conditions of use. Refer to Section
3.2.2 and Section 4.1.4 for details.