Instruction manual

SM425 INSTRUCTION MANUAL 4.0 PIPING
the necessary oxygen concentration (21 vol% O
2
) cannot be obtained, install reference gas piping as
described in Section 1.19, System 2.
4.1.4 Piping to the High-temperature Probe Adapter
• Refer to Section 1.11.2 for guidelines on using the high-temperature probe adapter.
• The sample gas should be at a temperature below 700°C before reaching the detector sensor. If
the process gas is under negative pressure, it should be fed to the detector by an auxiliary
ejector. Connect the auxiliary ejector (E7046EC/E7046EN) as illustrated in Figure 4-3. Mount the
pressure gauge as close as possible to the auxiliary ejector. If ambient temperature is too high,
mount the gauge in a location with a temperature below 40°C.
Figure 4-3 Mounting the auxiliary ejector
If the temperature of the process gas exceeds 700°C and its pressure exceeds 0.49k Pa, the sample gas
temperature may exceed 700°C at the detector. In such a case, connect a needle valve (found on the
open market) through a nipple (also found on the open market) to the probe adapter sample gas exhaust
(Rc 1/2) to restrict the sample gas exhaust volume.
Figure 4-4 Mounting the needle valve for restricting exhaust flow of the sample gas
70 42500001 REV A