Agilent Technologies NPD User manual

Installation Guide
Nitrogen-Phosphorus Detector on 6890 GC
Accessories G1575A, G1576A, G1594A, G1599A

Agilent Technologies, Inc.
2850 Centerville Road
Wilmington, DE 19808-1610
USA
© Agilent Technologies 2001
All Rights Reserved. Reproduction,
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
1
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
2
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
3
Nitrogen-phosphorus detector
Power switch
Makeup gas regulator
(nonEPC only)
Flow manifold
Printed circuit board
(early version)

Preparing the GC
4
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
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
6
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
7
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
8
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

Installing the flow manifold
9
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.
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.
Insert tip of
pliers here
Front detector
Back detector
Front inlet
Back inlet
Auxiliary
Left-most screw slot

Installing the flow manifold
10
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)
11
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.
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
Back
Front
Screw

Installing the makeup gas regulator (nonEPC detectors)
12
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.
5. Locate the pneumatics cover that you removed in Preparing the GC.
Remove the appropriate oval label from the cover.
Makeup gas regulator
Air
Hydrogen
Cut here
Back
Front
Back
Front

Positioning and securing the detector
13
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.
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.
Back
Front

Positioning and securing the detector
14
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
15
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.
Back detector slot
Front detector slot
Plugs into
main board
PC board

Connecting the detector
16
2. Attach the bead and signal cables to the PC board.
Signal cable
Bead cable
Signal connector
Bead connector
PC board

Connecting the detector
17
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
18
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