Yokogawa Multi Channel Oxygen Analyzer System ZR22/AV550G - Manual (Page 196)

IM 11M12D01-01E 11-2
11.1 Removing and Attaching the Front Cover
11.1.1 Removing the Front Cover
1) Loosen the 4 knob bolts by hand, and then loosen the lock screw with the Allen
wrench supplied.
2) Remove the front cover by lifting up slightly then pulling away from the case.
11.1.2 Attaching the Front Cover
1) Attach the front cover, aligning the slots on the sides of the cover with the knob bolts
on the case, and then pull the cover down until it is seated firmly.
2) Hand tighten the knob bolts, and then securely tighten the lock screw with the Allen
wrench supplied.
Knob Bolt
Lock Screw
F11.1E.eps
Figure 11.1 How to Remove/Attach the Front Cover
11.2 Hot Swap Function
The averaging converter features a function that allows a desired detector to be discon-
nected/reconnected for inspection or maintenance just by turning off the power of the
relevant channel without system shutdown. This function is called hot swap. While
power to a channel is being removed, the channel is automatically eliminated from the
averaging groups and does not affect any other channels. Since the output circuits for
both the channel card and the heater of the corresponding channel are mechanically cut
off from the other circuits, maintenance and inspection work can be done safely (Figure
11.2).
When the cannel is restored by the hot swap function after inspection or maintenance,
the cannel card will be included in the original averaging groups after warm-up period.
The individual analog output is held at a value preset in the "mA-output Setup" during
warm-up period.