Table of Contents

Inspection and Replacement of FID Jet

Required devices¶

No.	Parts name	Category	Required number	Note
①	Tweezers	Other	1
②	Hexnut Driver For FID Nozzles	Hydrogen Flame Ionization Detector (FID)	1	Options
③	FID Nozzle Φ0.3	Hydrogen Flame Ionization Detector (FID)	1	φ0.3, standard (for capillary column)
④	FID Nozzle Φ0.8	Hydrogen Flame Ionization Detector (FID)	1	φ0.8, for analysis of aqueous solution (for capillary column)
⑤	FID Nozzle ASSY for packed column	Hydrogen Flame Ionization Detector (FID)	1	φ0.5, for packed column
⑥	Screwdriver	Other	1
⑦	Stylet Wire (0.1ｍｍ×150ｍｍ)	Other	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 are 50 °C or lower.
After checking the temperatures, turn OFF the main power to the instrument.

Step 2¶

Remove the column installed on FID.

Step 3¶

Open the INJ/DET cover (★1).

Step 4¶

Remove the stopper plate, and remove the igniter.

Step 5¶

Loosen the two screws, and remove the upper cover (★2), high voltage unit (★3), and collector (★4) together.

Hint

The screws have a fall-prevention structure, so removal is not necessary.

Step 6¶

Loosen the FID nozzle (③) with a hexnut driver (②).

Step 7¶

Remove the FID nozzle with tweezers (①).

Step 8¶

Inspect the area around the tip of the FID nozzle.

If the nozzle is dirty, clean it. For cleaning, use cotton swabs or a soft brush soaked in organic solvent (acetone, hexane, etc.).
When the nozzle outlet hole is clogged, use stylet wire (⑦) to remove the clog.
When it is heavily contaminated by the sample or the clogging at the nozzle tip cannot be removed, replace the nozzle.

Hint

Soaking in organic solvent (hexane, acetone, etc.) is also effective.
Ultrasonic cleaning provides even better cleaning results.

Step 9¶

Install the FID nozzle（③） inside the FID body, tightening it securely with a hexnut driver (②).

Step 10¶

Attach the assembled collector, upper cover, and high voltage unit to the FID body, and tighten the two screws to fix them.

Note

Ensure that the screws are tightened alternately and gradually to apply even force to the collector.

Step 11¶

Attach the igniter, and fix it with the stopper plate.

Step 12¶

Close the INJ/DET cover.

Note

If the nozzle was cleaned using organic solvents, increase the detector temperature to 20–30°C above the normal operating temperature and perform a bake-out for about 3–4 hours prior to use.
Residual organic solvents can contribute to noise and other issues.