Michell Instruments XZR500ST, User Manual

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XZR500 User’s Manual
Michell Instruments 3
INTRODUCTION
1.2 General Remarks
The analyzer is made up of a measurement probe and a Control Unit.
1.2.1 Sensor Head and Probe
The semi in-situ arrangement consists of the following elements:
• Sensor head, containing MSRS, sensor furnace, cable connection &
calibration port.
• Probe, comprising of an inner and outer tube to allow fl ow of sample from
fl ue to sensor.
The sample gas is returned to the fl ue practically unchanged in composition and
condition. This is due to the very small amount of sample required to diffuse into the
sensor furnace.
The gas fl ow is shown by the arrows in Figure 4 below. In this example, the stack is
vertical and the fl ue gas fl ow direction is upwards.
Using the Pitot tube effect, gases enter through the hole near the tip of the outer tube
and circulate in the space between the outer tube (25, 2) and the inner tube (23).
During this process the gases contact the sensor through diffusion. They then fl ow into
the inner tube and to the fl ue via the bevelled edge.
The tubes are fi tted so that the bevelled edge of the inner tube and the holes of the
outer tube face in opposite directions.
8
25
6
2
1
3
4
5
7
9
10
11
12
13
14
15
16
17
18
19
20
21
24
22
23
26
27
28
29
1 Sensor housing 11 XZR500 connector block 20 M6 Nut for fi xing XZR500 probe plate
2 Outer tube 12 SS bulkhead union for cal.gas 21 M6 washer
3 Sealing head 13 2 sealing ferrules 22 M6 lock washer
4 XZR500 furnace 14 Nut for fi xing bulkhead union 23 Inner tube
5 XZR500 MSRS 15 Stainless steel plug 24 VITON 8 x 2.5 O-ring
6 Gasket for fl ange (x2) 16 M8 lock washer 25 Outer tube
7 Gasket for wheel 17 Cable gland 26 Locking ring
8 Inter-tubes gasket 18 M8 spacer 27 Gasket for plug
9 Gasket for sealing screw 19 CHC 6x25 screw for fi xing
XZR500 sensor attachmt plate
28 Big rear nut
10 TRF 3x16 screw for connector 29 Inter-tube gasket
Figure 4
XZR500 Sensor Head & Probe