Michell Instruments XZR500ST, User Manual

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XZR500 User’s Manual
Michell Instruments 55
APPENDIX F
Appendix F Heated Flue Gas Ejection System (Optional)
The optional fl ue gas ejection system with heating is suitable for particularly severe
conditions of measurement. i.e. high stack gas temperature and high dust content.
In these cases a version without the inner probe tube can be used. A compressed air
ejection system draws the fl ue gases through the probe tube and heating minimizes
probe clogging. The system must be supplied with dry and de-oiled compressed air at
a pressure that can be adjusted between 0 and 3 relative bars.
The synoptic diagram of the installation follows. The system comprises:
• An XZR500 Sensor Head, without inner probe tube
• An air-ejector with adjustable fl ow placed at the sensor rear side. It is
heated and insulated
• An enclosure for controlling the ejector heating
• An intermediate junction box in case there is a large distance between
the probe and the regulation enclosure
• A compressed air connecting system
• Michell Instruments does not supply the system for cleaning the
compressed air and regulating the inlet pressure: the pressure regulator
should supply pressure between 0 and 3 bar.
Flu e g as
e x ha u st
H eatin g
re gul ation
en cl os u re
Supply o f c o mp resse d air
(CAUTION - P RESSURE
RE G ULATOR REQUIRED)
H eate d e j e c tor
230 VAC Supply
STACK
S ensor
H ea d
i
i
i
C ontro l
U nit
Figure 21
Installation of the Ejector/Heating System