Agilent Technologies NPD Manuale utente

Installation Guide

Nitrogen-Phosphorus Detector on 6890 GC

Accessories G1575A, G1576A, G1594A, G1599A

Agilent Technologies, Inc.

2850 Centerville Road

Wilmington, DE 19808-1610

USA

adaptation, or translation without

permission is prohibited, except as allowed

under the copyright laws.

Part number G1534-90347

First Edition, AUG 2001

Replaces Part No. G1534-90300: Installation

Guide, Nitrogen-Phosphorus Detector; Part

No. G1534-90305: Update for the Nitrogen-

Phosphorus Detector Assembly Installation

Guide; and Part No. G1534-90340: Installing

the Nitrogen-Phosphorus Detector EPC Flow

Control Manifold.

Printed in USA

Safety Information

The Agilent Technologies 6890 Gas

Chromatograph meets the following IEC

(International Electrotechnical Commission)

classifications: Safety Class 1, Transient

Overvoltage Category II, and Pollution

Degree 2.

This unit has been designed and tested in

accordance with recognized safety

standards and designed for use indoors. If

the instrument is used in a manner not

specified by the manufacturer, the

protection provided by the instrument may

be impaired. Whenever the safety protection

of the Agilent 6890 has been compromised,

disconnect the unit from all power sources

and secure the unit against unintended

operation.

Refer servicing to qualified service

personnel. Substituting parts or performing

any unauthorized modification to the

instrument may result in a safety hazard.

Disconnect the AC power cord before

removing covers. The customer should not

attempt to replace the battery or fuses in

this instrument. The battery contained in

this instrument is recyclable.

Safety Symbols

Warnings in the manual or on the

instrument must be observed during all

phases of operation, service, and repair of

this instrument. Failure to comply with these

precautions violates safety standards of

design and the intended use of the

instrument. Agilent Technologies assumes

no liability for the customer’s failure to

comply with these requirements.

WARNING

A warning calls attention to a condition or

possible situation that could cause injury to

the user.

CAUTION

A caution calls attention to a condition or

possible situation that could damage or

destroy the product or the user’s work.

Indicates a hot surface

Indicates earth (ground) terminal

Sound Emission Certification for Federal

Republic of Germany

Sound pressure Lp < 68 dB(A)

During normal operation

At the operator position

According to ISO 7779 (Type Test)

Schallemission

Schalldruckpegel LP < 68 dB(A)

Am Arbeitsplatz

Normaler Betrieb

Nach DIN 45635 T. 19 (Typprüfung)

Overview

This section reviews the procedure for installing a nitrogen-phosphorus

detector (NPD) on an Agilent 6890 Gas Chromatograph (hereafter referred

to as the GC.) Before following this procedure, refer to the safety

information on the inside back cover.

Parts List

EPC

• NPD assembly: capillary optimized or adaptable

• Top and bottom insulation

• Nutwarmer cup and insulation (for adaptable NPD only)

NonEPC

•NPD assembly: capillary optimized or adaptable

•Top and bottom insulation

•Nutwarmer cup and insulation (for adaptable NPD only)

•Makeup gas regulator

•Two machine screws

Required Tools

•Electrostatic protection such as a grounded wrist strap (part no.

9300-0969, large or part no. 9300-0970, small)

•T-20 Torx screwdriver

•Diagonal cutters

•7/16-inch wrench (nonEPC detectors only)

Overview

Steps

1. Preparing the GC

2. Installing the flow manifold

3. Installing the makeup gas regulator (nonEPC detectors only)

4. Positioning and securing the detector

5. Connecting the detector

6. Routing the tubing

7. Installing the nutwarmer cup (adaptable NPD only)

8. Restoring the GC to operating condition

9. Calibrating your detector (EPC detectors only)

Overview

Nitrogen-phosphorus detector

Power switch

Makeup gas regulator

(nonEPC only)

Flow manifold

Printed circuit board

(early version)

Preparing the GC

WARNING Hazardous voltages are present in the mainframe when the GC is plugged in.

Avoid a potentially dangerous shock hazard by unplugging the power cord

before removing the side panels.

1. Turn off the GC and unplug the power cord. Allow time for all heated

zones to cool and then turn off supply gases at their sources.

From the back of the GC (see the next figure):

2. Unsnap and lift off the pneumatics top cover.

3. Remove the RFI cover. Remove the screw with a T-20 Torx screwdriver,

slide the cover to the left until it disengages from the top rear panel, and

remove it.

4. If you are installing a nonEPC detector, remove the detector cover plate

from the front or back position by loosening the two screws with a T-20

Torx screwdriver and sliding the plate up and off.

Preparing the GC

5. Loosen the five captive screws in the top rear panel with a T-20 Torx

screwdriver. Grasp the panel at each end and gently lift it up and away

from the GC. Be careful not to disrupt the supply tubing.

6. Raise the gray plastic top cover (with the holes and ventilation slots) to

the vertical position. Examine the hinge in the right rear corner.

•Early 6890 models. 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 right side of

the cover and remove it.

•Current 6890 models. Raise the right side of the cover and remove

it.

Pneumatics cover

RFI cover

Makeup gas regulator

(nonEPC detectors only)

Loosen five

screws

Preparing the GC

7. Remove the electronics side cover. Loosen the two captive screws at the

top, slide the panel to the rear, and lift it off.

8. Remove the electronics top cover. Push in on the tab underneath the

back of the cover and lift it off.

Captive screws

Push clip under cover

Installing the flow manifold

This section describes the installation of the current version of the manifold.

For information about the early version, see the Appendix.

Caution Always hold the manifold by its support bracket to avoid damaging board

components.

1. Route the ribbon cable behind the manifold assembly as shown in

Figure 1. Then, slide the manifold and bracket assembly into the slot

until the bracket seats flush against the end of the rails. See Figure 2.

Figure 1. Routing the ribbon cable

Back view of manifold Manifold installed with cable routed to left

Installing the flow manifold

Figure 2. Manifold, after installation

2. Route the gas tubing behind the manifold, over the top of the chassis,

and through the slots.

3. Connect the ribbon cable to the mating connector on the pneumatics

board. Arrange the cable to keep it away from the valves and keep it

from being pinched against the manifold.

For the back detector, you may want to loosen the manifold and slide it

out of the carrier a few centimeters to connect the cable to the

pneumatics board. Then, reinstall the manifold.

4. From the front, secure the manifold to the chassis using the Torx T-20

screw.

Figure 3. Captive screws and tubing

Bracket is flush

with carrier rails

Front

captive screw

Back

captive screw

Front detector tubing

Slot for rear detector tubing

Indice

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