Agilent Technologies 7890A Manual

Agilent Technologies

Replacing the NPD Bead

Instruction Guide

NPD Bead Replacement.book Page 1 Monday, October 13, 2008 2:32 PM

2Instruction Guide

Notices

No part of this manual may be reproduced in

any form or by any means (including elec-

tronic storage and retrieval or translation

into a foreign language) without prior agree-

ment and written consent from Agilent

Technologies, Inc. as governed by United

States and international copyright laws.

Manual Part Number

G3430-90037

Edition

Third Edition, October 2008

Second Edition, September 2008

First Edition, March 2004

Printed in USA

Agilent Technologies, Inc.

2850 Centerville Road

Wilmington, DE 19808-1610 USA

Warranty

The material contained in this docu-

ment is provided “as is,” and is sub-

ject to being changed, without notice,

in future editions. Further, to the max-

imum extent permitted by applicable

law, Agilent disclaims all warranties,

either express or implied, with regard

to this manual and any information

contained herein, including but not

limited to the implied warranties of

merchantability and fitness for a par-

ticular purpose. Agilent shall not be

liable for errors or for incidental or

consequential damages in connec-

tion with the furnishing, use, or per-

formance of this document or of any

information contained herein. Should

Agilent and the user have a separate

written agreement with warranty

terms covering the material in this

document that conflict with these

terms, the warranty terms in the

separate agreement shall control.

Safety Notices

CAUTION

A CAUTION notice denotes a haz-

ard. It calls attention to an operat-

ing procedure, practice, or the like

that, if not correctly performed or

adhered to, could result in damage

to the product or loss of important

data. Do not proceed beyond a

CAUTION notice until the indicated

conditions are fully understood and

met.

WARNING

A WARNING notice denotes a

hazard. It calls attention to an

operating procedure, practice, or

the like that, if not correctly per-

formed or adhered to, could result

in personal injury or death. Do not

proceed beyond a WARNING

notice until the indicated condi-

tions are fully understood and

met.

NPD Bead Replacement.book Page 2 Monday, October 13, 2008 2:32 PM

Replacing the NPD Bead

Instruction Guide

Agilent Technologies

Replacing the NPD Bead

7890A and 6890 Gas Chromatographs

This instruction guide reviews the procedure for installing a

bead on a nitrogen- phosphorus detector (NPD). Before

following this procedure, refer to the safety information on the

inside front cover and in your GC user information.

Parts list

•1 NPD bead assembly (ceramic or Blos)

•Cap for the bead

•Test chromatogram

NOTE If you used Blos beads before 2008, you may notice that the current bead

has a slightly different shape and color. This is normal.

NPD Bead Replacement.book Page 3 Monday, October 13, 2008 2:32 PM

4Instruction Guide

Replacing the NPD Bead

Required tools

•T- 10 Torx screwdriver

GC Firmware

•If using a 7890A Series GC, it is recommended that the

firmware version is A.01.09 or higher.

•If using a Blos bead on a 7890A Series GC, make sure the

firmware version is A.01.09 or higher.

•If using a 6890 Series GC, make sure the firmware version is

A.03.05 or higher.

•If using a Blos bead on a 6890 Series GC, make sure the

firmware version is A.03.08 or higher. (Firmware versions

earlier than A.03.08 will immediately destroy a Blos bead if

you use the Adjust Offset feature.)

Figure 1 Blos bead assembly

NPD Bead Replacement.book Page 4 Monday, October 13, 2008 2:32 PM

Replacing the NPD Bead

Instruction Guide 5

Preparing the GC

1 Gather the following:

•Lint- free gloves

•T- 10 Torx screwdriver

2Set the NPD bead voltage to 0.0. (Do not set it to Off.)

Agilent data system users: After setting the bead voltage to

0.0, save the data system method and shut down the

instrument session. (Note that in some data system versions,

you may need to use the GC keypad to set the voltage. To do

this, the GC keypad must be unlocked and you must close the

GC parameters screen of the data system. Upload the revised

setting, then save the method and shut down the instrument

session.)

3Set Adjust Offset to Off.

4Cool the detector to 60 °C or lower. Leave all gas flows on. To

cool the detector faster, raise the GC detector cover and open

the hinged NPD cover.

CAUTION The bead is delicate. Be careful not to break or crack the bead. When

performing maintenance on the NPD, avoid touching the bead with

your fingers, and prevent it from coming in contact with other surfaces.

WARNING Hazardous voltages are present when the electronics top cover is

open.

NPD Bead Replacement.book Page 5 Monday, October 13, 2008 2:32 PM

6Instruction Guide

Replacing the NPD Bead

5Remove the necessary GC covers.

•7890A models: Raise the GC detector top cover. Loosen

the screw on the electronics top cover and lift cover

(Figure 2).

•6890 models: Gently lift the gray plastic detector top

cover (with the holes and ventilation slots).

For models with the hinge bracket: The hinge is a

metal bracket attached to the oven top. Pull the clip at its

top toward you to release the hinge pin. Push the pin to

the left to release the cover. Raise the cover and remove it.

Remove the top electronics cover. Push the clips

underneath the cover (shown in Figure 3) toward the

center to disengage them.

Figure 2 Lifting the electronics top cover (7890A)

NPD Bead Replacement.book Page 6 Monday, October 13, 2008 2:32 PM

Replacing the NPD Bead

Instruction Guide 7

Other models: Push the clips underneath the cover toward

the center to disengage them.

Figure 3 Removing the top electronic cover (6890)

Clips

NPD Bead Replacement.book Page 7 Monday, October 13, 2008 2:32 PM

8Instruction Guide

Replacing the NPD Bead

Removing and Installing the Bead

1Put on lint- free gloves before touching any of the detector

parts.

NOTE The illustrations below show a ceramic bead. Blos bead installation is the

same.

WARNING Be careful! The oven or detector fittings may be hot enough to cause

burns.

CAUTION Wear clean, lint-free gloves to prevent contamination of parts with dirt

and skin oils.

NPD Bead Replacement.book Page 8 Monday, October 13, 2008 2:32 PM

Replacing the NPD Bead

Instruction Guide 9

2Twist the ring to disconnect the bead assembly cable. Push

and twist the lock so that the button slides up in the groove,

then pull the cable ends apart.

NPD Bead Replacement.book Page 9 Monday, October 13, 2008 2:32 PM

10 Instruction Guide

Replacing the NPD Bead

3Remove the 3 T- 10 Torx screws from the bead assembly.

4Gently lift up and remove the old bead assembly. Avoid

bumping the bead on the sides of the collector.

5Remove the protective cap covering the new bead.

Bead assembly

NOTE For a new Blos bead, the bead should be centered as shown in Figure 1. If

you notice that the bead assembly does not appear like the assembly

shown in Figure 1, carefully center the bead. Be sure to not contaminate

the bead during this process.

NPD Bead Replacement.book Page 10 Monday, October 13, 2008 2:32 PM

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