YOKOGAWA DT450G Series, User Manual, Page: 16 / 41

<2. Instruction>
2-1
IM 11K01C01E
2. Instruction
The DT450G is designed for indoor installation or installation in an outdoor location free from
splashes of rainwater and direct sunlight.
This chapter explains how to install the DT450G in the following order of topics.
• Selection of installation location
• Machining of inlet for sensor probe
• Installation of DT450G
2.1 Selection of Installation Location
The DT450G is designed for mounting on a duct with a width of 650 to 4000 mm (when the
standard probe length is 460 mm) or other alternative locations. Install the DT450G in a location
where optimal measurement can be carried out and inspection and maintenance is easy.
When selecting an installation location, make sure it also satisfies the measuring and ambient
environmental conditions described in Section 1.2. In addition, the installation location must meet
the following requirements.
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Availability of Typical Dust Concentration
The most suitable location along a duct is where there is no flowmeter or valve that may disturb
the gas flow and where the duct is straight and the length is adequate in comparison with the
inside width of the duct. (Ideally, the straight portion should be no less than eight times the length
of the width. Locate the probe inlet in a position 3/8 the length of the straight portion from the
downstream edge and 5/8 the length from the upstream edge.)
Note: Insert the sensor probe into the inlet so that it is perpendicular to the stream of gas.
The DT450G can be positioned in such a manner that its sensor probe is level or facing downward at an angle up to 90º.
Downstream
d ( ≥ 650 mm)
L ≥ 8d is recommended
Upstream
3
8
5
8
Duct
Dust monitor
Install at the center of the duct and
perpendicular to the gas flow.
F0701.ai
Figure 2.1 Installation of Dust Monitor on Straight Part of Duct
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No Noise Effects
Make sure the output signal will not be affected by noise arising from plant equipment or other
structures. In an electrostatic dust collector is used, locate the DT450G at least 20 m away from
the dust collector. When monitoring such dust collectors as a bug filter, locate the DT450G in the
upstream of the blower.