YOKOGAWA DT450G Series, User Manual, Page: 29 / 41

<4. Operation>
4-2
IM 11K01C01-01E
4.2 Preparation for Operation
Before you start operating the DT450G, carry out the following tasks.
• Inspection of the state of installation
• Supply of purge air
• Supply of power
• Parameter (Setting of measurement range. Setting of alarm points, Setting of damping
action)
4.2.1 Inspection of the State of Installation
Check that all the specifications are completely satisfied with the installation of the DT450G.
Also check that the DT450G wiring and piping have been correctly connected. Especially, make
sure the following are true.
• The DT450G is securely mounted onto the probe inlet and is free from effects of strong
mechanical vibration. In addition, the short tubing of the probe inlet is adequately heat-
insulated and the main unit’s casing is not exposed to direct sunlight that causes an
abnormal temperature rise or subject to heat radiated from other equipment.
• The duct or other alternative facilities where the DT450G is mounted is reliably grounded.
• Wires are correctly connected to the terminals of the DT450G. In addition, the cables are
securely fixed by cable glands so as to prevent any corrosive gas or moisture from entering
the monitor.
• The air-purge piping and each cable connected to the DT450G have a sufficient margin of
length necessary for maintenance.
4.2.2 Supply of Purge Air
Using the pressure control valve, adjust the supply pressure of purge air as noted below.
Then, fully open the stop valve.
• Supply pressure = Pressure of gas under measu approximately 50 kPa
4.2.3 Supply of Power
Turn on the power switch installed in the power line to feed power to the DT450G.
When the power is turned on, the green LED indicator lamp on the monitor comes on.
It takes approximately 30 minutes for the DT450G to reach steady-state operation.