Agilent Technologies NPD Installation Manual

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Nitrogen-Phosphorus Detector on 6890 GC

Accessories G1575A, G1576A, G1594A, G1599A

Installation Guide

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 NitrogenPhosphorus 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)

Agilent Technologies, Inc. 2850 Centerville Road Wilmington, DE 19808-1610 USA

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)

Nitrogen-phosphorus detector

Overview

Makeup gas regulator

(nonEPC only)

Flow manifold (early version)

Power switch

Printed circuit board

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.

Pneumatics cover

RFI cover

Makeup gas regulator (nonEPC detectors only)

Loosen five screws

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.

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.

Captive screws

8. Remove the electronics top cover. Push in on the tab underneath the back of the cover and lift it off.

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.

Back view of manifold Manifold installed with cable routed to left

Figure 1. Routing the ribbon cable

Installing the flow manifold

Figure 2. Manifold, after installation

Bracket is flush with carrier rails

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.

Front detector tubing

Front captive screw

Back captive screw

Slot for rear detector tubing

Figure 3. Captive screws and tubing

Installing the flow manifold

Caution If your current top rear panel is not similar to the one shown in Figure 4,

discard it and use the new one supplied with your accessory kit.

5. Using a pair of needle-nosed pliers, remove the appropriate top rear panel detector cutout for the NPD. Also remove any cutouts needed to access other manifolds or accessories installed in the GC. See Figure 4.

Insert tip of

pliers here

Back inlet

Front detector

Auxiliary

Left-most screw slot

Back detector

Front inlet

Figure 4. Top rear panel cutouts

6. Place the top rear panel on its left-most mounting screw. Work from left to right and use the screw as a hinge, slide each manifold ID tag through its cutout in the panel. When all the tags are through the panel, finish installing the panel on the GC.

7. Install the RFI shield, the pneumatics cover, and the detector top cover.

Installing the flow manifold

8. Connect the source gas lines to the manifold.

Figure 5. Gas line connections

9. Restore gas pressures and leak test the fittings.

Installing the makeup gas regulator (nonEPC detectors)

1. Install a screw in the front or back position of the pneumatics carrier. Do not tighten the screw.

Install a screw in the makeup gas regulator. Do not tighten the screw.

Back Front

2. Place the makeup gas regulator in the front or back position of the pneumatics carrier. Tighten the screws with a T-20 Torx screwdriver.

3. Connect the tube on the makeup gas regulator to the fitting labeled MU on the flow manifold. Tighten the nut fingertight, then use the 7/16-inch wrench to tighten it 3/4 of a turn. Follow the same procedure for

Screw

Installing the makeup gas regulator (nonEPC detectors)

connecting the air and hydrogen tubing (labeled at the back of the instrument) to the flow manifold.

4. Locate the RFI cover that you removed in Preparing the GC. Remove the front or back rectangular cutout on the cover. Use diagonal cutters to cut the metal or work the cutout back and forth until it breaks free from the cover.

Air

Hydrogen

Makeup gas regulator

Cut here

Back

Front

5. Locate the pneumatics cover that you removed in Preparing the GC. Remove the appropriate oval label from the cover.

Back

Front

Positioning and securing the detector

1. Remove the round metal cutout on the oven top and the square plastic cutout in the electronics carrier in the front or back detector position, if necessary. Cut the metal circle with diagonal cutters so that the nibs are connected to the piece removed. Cut the plastic in six places with diagonal cutters. Discard the cutouts.

Back Front

2. Lift out the die-cut insulation plug from the front or back detector position, if necessary.

Caution Be careful to remove only the insulation within the scribed circle.

3. Carefully remove the scribed circle of insulation from the oven top to create an opening into the oven.

Positioning and securing the detector

Method 1: Use a sharp knife to cut out the insulation using the scribed circle as a guide.

Method 2: Pierce the insulation with a screwdriver. Rotate the screwdriver around the scribed circle to remove excess insulation.

Clean up any pieces of insulation that fall inside the oven.

4. Lower the detector pallet into the cavity. Be sure that the insulation is in place. Partially tighten the four screws with a T-20 Torx screwdriver. Retighten all the screws to snugness.

Captive screws

Insulation

Pallet

Connecting the detector

Caution Board components can be damaged by static electricity; use a properly

grounded static control wrist strap when handling the board.

1. Remove the PC board from its static control bag, slide it into the front or back slot on the main circuit board and plug it into the main board.

Plugs into

main board

Front detector slot

Back detector slot

PC board

Connecting the detector

2. Attach the bead and signal cables to the PC board.

Bead cable

Signal cable

PC board

Signal connector

Bead connector

Connecting the detector

3. Connect the heater/sensor cable to the square connector closest to the front or back detector.

Heater/sensor cable

Heater/sensor connector

(back position)

Heater/sensor connector (front position)

Routing the tubing

Route the tubing from the flow manifold through the slots in the top of the carrier to the detector area.

Front detector tubing

Back detector tubing

Installing the nutwarmer cup (adaptable NPD)

1. Install the insulation in the cup.

2. Push the wire spring lever at the bottom of the cup to the right to uncover the hole.

3. From inside the oven, place the cup over the detector fitting so that the top of the cup touches the top of the oven.

4. Release the spring. Make certain the spring fits in the groove of the detector fitting.

Restoring the GC to operating condition

1. Reinstall the electronics side panel.

2. Reinstall the top rear panel

3. Reinstall the detector cover.

4. Reinstall the electronics top cover.

5. Plug in the GC and turn it on.

6. Press [Front Det] or [Back Det]. If the detector has been properly installed, you will see the following display:

EPC NonEPC

FRONT DET (NPD) Te m p 2 4 O f f < H2 flow 0.x† Off Air flow 0.x† Off Mkup flow 0.x† Off Adjust offset Off Output 0.0 Bead voltage Off

An actual flow value is displayed when the gases are off or not connected. This is not an

†

error. After the gases are connected and the detector is operational, the actual flow values will be equal to the setpoint values.

Tem p 2 4 O ff < H2 flow Off Air flow Off Mkup (He) Off Adjust offset Off Output 0.0 Bead voltage Off

FRONT DET (NPD)

7. If you have an EPC detector, zero the pressure sensors: a. Make certain that your detector and makeup gases are not

connected to your detector.

b. Press [Options] and scroll to Calibration Front detector or

Back detector. c. Scroll to Oxidizer zero and press [On]. d. Scroll to H2 zero and press [On]. e. Scroll to Makeup zero and press [On].

8. Turn the GC off and unplug the power cord. Plumb the air, hydrogen, and makeup gases to your detector. See the Site Preparation and Installation Manual for instructions.

Restoring the GC to operating condition

9. Reinstall the RFI cover.

10. Replace the pneumatics top cover.

11. Plug in the GC and turn it on.

12. If your GC did not detect the new NPD, check the following connections:

• Detector card to main board

• Manifold to pneumatics board

• Heater-sensor connector

• Bead cable to detector card

• Signal cable to detector card

If you installed an EPC NPD but you have only temperature control for the detector, check the connection between the flow manifold and the pneumatics board.

Appendix: Installing the pneumatics module (early version)

Caution Board components can be damaged by static electricity; use a properly

grounded static control wrist strap when removing the electronics covers.

1. From the back of the GC, locate the pneumatics carrier.

Pneumatics carrier

2. If you are installing a detector in the front position and an inlet is installed in the back position, unplug the back inlet ribbon cable. Unlock the connector by pushing the tabs away from the center.

Connector locations

Back detector

Front detector

Back inlet

Front inlet

Appendix: Installing the pneumatics module (early version)

3. Locate the troughs in the flow manifold and the ridges in the pneumatics carrier. Slide the flow manifold into the carrier, lining up the ridges and troughs.

Back detector

Front detector

Ridges

Troughs

Flow manifold

4. Plug the ribbon cable into the front or back connector. Make certain the connector is firmly seated and locked. If the flow manifold is installed and plugged into the correct position, the ribbon cable will retain its fold as shown in the diagram. If you unplugged an inlet ribbon cable in Step 2, replace it.

Open connector

Folded ribbon cable

Locked connector

Appendix: Installing the pneumatics module (early version)

5. From the front of the GC, secure the flow manifold to the carrier by tightening the captive screw until snug using a T-20 Torx screwdriver.

Front captive screw

Back captive screw

Printed on recycled paper.

This product is recyclable.

Agilent Technologies, Inc. Printed in USA AUG 2001

G1534-90347

Agilent Technologies NPD Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual