Replacement of Filling Material in the SCD Ozone Scrubber
Required devices¶
No. |
Parts name |
Category |
Required number |
Note |
---|---|---|---|---|
① |
Filling material in the ozone scrubber |
1 |
||
② |
Spanner, SCD, Maintenance |
1 |
||
③ |
Tweezers |
1 |
Procedures¶
Step 1¶
On the instrument monitor or workstation, check that the temperature of the column oven is lower than 40 °C, and check that the temperatures of the injection port and detector (SCD-IF part and electric furnace) are 50 °C or lower.
After checking the temperatures, turn OFF the main power to the instrument.
Step 2¶
Remove the ozone scrubber (★1) from the instrument.
Pull the ozone scrubber toward you to remove it.
Step 3¶
Remove 2 gas pipes at the top and bottom of the ozone scrubber using a spanner, SCD, maintenance (②).
Step 4¶
Loosen the nut (★2) at the top of the ozone scrubber by hands and remove the cap (★3).
Step 5¶
Remove silica wool (★4) with tweezers (③) and replace hopcalite (★5) in the ozone scrubber.
-
The ozone scrubber filler (①) contains 160 mL of hopcalite.
-
Recommended amount of hopcalite is 80 mL. Excess amount may prevent adequate reduction of the detector inner pressure.
Step 6¶
Spread silica wool over hopcalite.
Spread silica wool without space. If there is a space, hopcalite powder may flow into the pump resulting in a failure of the pump.
The ozone scrubber filler (①) contains 4 g of silica wool. Use about 1 g of it.
Step 7¶
Install the cap (★3) and tighten the nut (★2) by hands.
Step 8¶
Rotate the ozone scrubber by 180° (upside down) and replace silica wool at the bottom.
As the same as steps 4 to 7, remove the nut and cap, and replace silica wool. There is hopcalite only at the top.
Step 9¶
Install 2 gas pipes at the top and bottom of the ozone scrubber.
Turn the nut by hand and then tighten it additional one-half turn with a spanner, SCD, maintenance (②).
The ozone scrubber has no right-side up, therefore, either side of the scrubber can face upward.
Step 10¶
Install the ozone scrubber on the instrument.