Yokogawa Integral Oxygen Analyzer ZR202 Manuel d'utilisateur télécharger pdf (Page 135)

<11.Inspection and Maintenance>

11-6

IM 11M12A01-04E

Replacement of heater assembly

Refer to Figure 11.4 as an aid in the following discussion.

Remove U-shaped pipe support ④, U-shaped pipe ⑤, Filter and the sensor (cell) ⑥, following

Section 11.1.2, earlier in this manual.

Remove the two screws ⑮ that tighten the cover ⑫ and slide it to the ange side. Remove the four

bolts ⑩ to remove the converter ⑯. Then remove the three connectors to which leadwire from the

heater and thermocouple is connected.

Loosen screw ⑲ until heater assembly 󰚨 plate can be removed. There’s no need to remove O-ring ⑱

which prevents screw ⑲ from dropping out. Pull out connector ⑬. Loosen and remove the screw ⑧

with a special wrench (part no. K9470BX or equivalent) and then remove the heater assembly 󰚨 from

the detector 󰚩.

To reassemble the heater assembly, reverse the above procedure:

Insert the heater assembly 󰚨 into the detector 󰚩, while inserting the calibration pipe in the detector

󰚩 into the heater section in the heater assembly 󰚨 as well as in the bracket hole. Coat the screw ⑧

with grease (Never-Seez: G7067ZA) and tighten the screw ⑧ with a special tool (part no. K9470BX or

equivalent) with a tightening torque of 12N·m ± 10%.

Next, to install the O-rings ㉒ on the calibration-gas and reference-gas pipes, disassemble the

connector ⑬ in the following procedure:

First, remove the screw 󰚪 and then remove the plate ⑰ and two caps ⑳. If the O-ring ㉒ remains

in the hole, pull them out from the back. Pass the heater and thermocouple leadwire through the

connector ⑬. Also, pass the calibration gas and reference gas pipes through the opening of the

connector ⑬. If the O-ring ㉒ fails, replace it with a new one.

Push the two caps ⑳ into the associated opening of the connector ⑬. Insert the plate ⑰, aligning it

with the groove of the cap ⑳, and tighten it with the screw 󰚪. If you attempt to insert the calibration

gas and reference gas pipes into the connector ⑬ without disassembling the connector ⑬, the O-ring

may be damaged. Tighten screw ⑲ in the heater assembly 󰚨 until connector ⑬ can’t move.

Reassemble in reverse order to the above disassembly procedure.

When installing the cell assembly ⑥, replace the metal O-ring ⑦ with a new one.

11.1.4 Replacement of Dust Filter

Set the dust lter ① in place using a special pin spanner (with a pin 4.5 mm in diameter: part no.

K9471UX or equivalent). If a dust lter that has already been replaced once is used again, apply

grease (Never-Seez: G7067ZA) to the threads of the dust lter.

11.1.5 Replacement of O-ring

The detector uses three different types of O-rings ⑭, 󰚜, and ㉒. One O-ring alone ⑭, or two O-rings

󰚜 and ㉒ are used. (For a pressure compensating model, two O-rings are used for individual uses.

Two O-rings 󰚜 and ㉒ are used for reference gas sealing and require periodic replacement.

11.1.6 Stopping and Re-starting Operation

When operation is stopped, take care of the followings so that the sensor of the detector cannot

become unused.

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 156 157

Pas de commentaire

Yokogawa Integral Oxygen Analyzer ZR202 Manuel d'utilisateur Page 135