Gow-Mac 5900 Series User manual

Operating Manual
Series 5900
Discharge Ionization Detector
Gas Chromatograph
Series 5900: 105-125 VAC, 60 Hz
Series 5902: 200-240 VAC, 50 Hz
October 2019
Rev. 1
READ INSTRUCTIONS
BEFORE OPERATING
277 Brodhead Road, Bethlehem, PA 18017-8600 U.S.A. Tel: [phone]

GOW-MAC Instrument Co.
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Series 5900 DID GC
1019, Rev. 1
3
Contents
SECTION 1 - SAFETY ..................................................................................... 5
SECTION 2 - SPECIFICATIONS...................................................................... 7
SECTION 3 - INSTALLATION.......................................................................... 9
SECTION 4 - OPERATING CONTROLS ........................................................17
SECTION 5 - OPERATION OF THE SERIES 5900 DID GC .........................21
SECTION 6 - MAINTENANCE & SERVICE................................................... 27
SECTION 7 - VALVES.................................................................................... 29
SECTION 8 - REPLACEMENT PARTS ........................................................ 33

GOW-MAC Instrument Co.
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CAUTION CAUTION CAUTION
This instrument was designed for DRY sample applications only!
Care must be taken to make sure only moisture-free samples are
introduced into the system.
GOW-MAC®Instrument Company is not responsible for damage to
equipment caused by exposure to hydrolyzed samples.

Series 5900 DID GC
1019, Rev. 1
5
SECTION 1 - SAFETY
1.1 Thissectionisdesignedtobringspecialattentiontospecicareasorpracticesthat
may pose particular hazards to personnel and/or equipment safety only. For complete
installation instructions, see Section 3.
It is in the operator’s best interest to read this section to ensure the safe operation of
the instrument.
1.2 BURN HAZARDS
The detector, column, and column oven lid may reach very high temperatures and
remain HOT for several hours after the instrument has been shutdown. Wear protective
gloves to prevent painful burns resulting from contact with the hot surfaces.
1.3 ELECTRICAL HAZARDS
A. This instrument employs voltages that are dangerous. EXTREME caution must
be exercised when working with this equipment. Disconnect the instrument from
all power sources before removing front, side or back panels and exposing
potentially dangerous voltages.
B. DO NOT handle exposed voltage terminations until the load and/or supply has
been discharged (grounded). An unloaded supply may take up to 15 seconds to
fully discharge.
C. Make surethat the actual line voltage is the proper value for which the instrument
was designed. (For properly grounded outlet only).
D. DO NOT overload the AC outlet with other electrical equipment.
E. Adhere to the color coding descriptions when hooking up electrical connections.
F. Repair or replace faulty or frayed wiring IMM EDIATELY.
1.4 COMPRESSED GAS CYLINDERS
Compressed gas cylinders are potential sources for serious accidents, injuries, and
even death if proper precautions and safety practices are not followed. Therefore,
during handling and use of these gases, be certain to use applicable safety pre-
cautions described by your local compressed gas supplier, the Compressed Gas
Association, and/or O.S.H.A. regulations.
A. Read the label on all cylinders BEFORE using to identify the cylinder contents. If
the label is illegible, return the cylinder to the supplier. DO NOT ASSUME THE
CONTENTS.

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B. All gas cylinders in use and in storage MUST be secured to an immovable
structure to prevent accidental falling or movement. Read the relevant safety
codes.
C. DO NOT move or transport cylinders with regulators attached or without safety
cap screwed on over the valve system.
D. Store or move cylinders ONLY in the vertical position.
E. Store cylinders in a well ventilated area away from heat or ignition sources.
F. When installing tubing, provide ONLY approved, adequate pressure reducing
regulators and pressure relief devices to prevent over-pressurizing the tubing and
equipment.
WARNING
READ CGA AND/OR O.S.H.A PROCEDURES FOR PROPER HANDLING OF
COMPRESSED GAS CYLINDERS.
1.5 GENERAL
  A. Performperiodicleakchecksatallttingareas.TheGOW-MACModel21-070
   MiniGasLeakDetectorisrecommendedtondsmallleaks.
B. Keep combustibles away from gas cylinders and eliminate ignition sources.
C. DO NOT place papers, charts, samples, etc. on top of the GC.
D. Maintain adequate ventilation. Vent all gases to the outside. DO NOT allow
   ammableand/ortoxicwastestoaccumulate.
E. De-pressurize supply gas piping before working on it.

Series 5900 DID GC
1019, Rev. 1
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SECTION 2 - SPECIFICATIONS
2.1 The GOW-MAC SERIES 5900 DID is a rugged, compact gas chromatograph designed
for the analysis of low concentrations of impurities in base gases.
2.2 The right-hand section of the SERIES 5900 contains the electronics necessary for
the proper operation of the gas chromatograph. A 7” LCD digital touchscreen will
control the DID high voltage, column and detector temperatures, valves and signal
output. Contained within the internal housing is the signal processing and support
electronics for column oven and DID.
2.3 The center section of the chromatograph houses the column oven, a purged housing
which contains the pneumatically actuated valves and the DID detector, and bellows
 meteringvalvestocontrolthecolumns,detectorandpurgegas.Allinletttingsand
 columnttingsareVCRtype.Therearealsoexitportsformeasuringcolumnow, 
 purgeowandsampleowwhichare1/8"compressionttings.
There are a maximum of four pneumatically actuated valves mounted inside a purged
 ho u si n g. Re fe r to t h e sys te m  o w d i ag r am a n d va lve s e c t i o n to d ete r m i ne w h i c h va lve s 
are included in your Series 5900.
2.4 SpecicationsfortheSeries5900DIDGC
  Dimensions:19.5"Wx25"Dx121/2"H(48.26cmx63.5cmx31.75cm)
Weight: Net: 50 lbs. (22.68 kg)
Power Requirements: Series 5900: 105-125 VAC, 60 Hz, 1100 W
Series 5902: 200-240 VAC, 50 Hz, 1100 W
Fuse: Series 5900: 10 amp
Series 5902: 5 amp
Column Oven
  Dimension:10"Wx41/2"Dx71/2"H(25.64cmx11.54cmx19.23cm) 
Temperature Range: ambient to 300 °C
Display Readout: 7” LCD Digital Touchscreen
Temperature Control: digital programmable PID controller, solid state, time
proportioning, RTD input, direct reading, ambient to 300 °C
on display screen
Detector
Type: Discharge Ionization
Sensitivity: 5 ppb CH4
Carrier Gas: Grade 6 purity helium (He)
Discharge Gas: Grade 6 purity helium (He)
Temperature Range: ambient to 120 °C

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Gas Flow
 Bypass/needlevalveforowcontrolofpurgedhousingowrate,whileaowmeteris
 usedtomeasurethesampleowrate.
 Uptosix(6)bellowsmeteringvalvesforseparateowcontrolofcolumns,carrier
gases and the discharge gas can be used.
GC Support Gas Specications
Detector Service Gas Grade, purity Supply Pressure (psig)
Recommended Maximum
All Valve actuator Air or nitrogen
Instrument
99.99%
(note 1)
50 80
DID
Carrier and
detector
discharge
Helium
UHP
99.9999%
(note 2)
100 120
Purge Helium Instrument
99.99% 80 120
Calibration Analysis-
dependent 15 20
Sample various 15 20
Note 1: Air or N2 from cylinder is preferred. If plant air from compressors must be used, an oil separator,
waterdryer,and40micron(orsmaller)particlelterarerequired.
Note 2:ForDIDcarrierservice,UHPhelium,99.9995%purity,mustbefurtherpuriedbyaGOW-MAC
model75-800noblegaspurierorequal.
High Voltage Discharge Ionization Power Supply
Output Voltage: up to 1000 V Max. Output Current: 10 mA
High Voltage Polarization Power Supply
Output Voltage: up to 500 V Max. Output Current: 1 mA
Electrometer Amplier
Circuit:solidstateFEToperationalamplierpoweredbyvoltageregulatedhybrid
regulator circuit
Sensitivity: 1.5 x 10-12 A, full scale 1 mV recorder
Dynamic Range: 1 x 106
Noise: with cable +3 µV at maximum sensitivity
Drift: <2 µV/hr under controlled environmental conditions

Series 5900 DID GC
1019, Rev. 1
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SECTION 3 - INSTALLATION
3.1 It is EXTREMELY IMPORTANT that the operator become familiar with this section
BEFORE proceeding with the installation of this instrument.
3.2 Additional Equipment Required*
A. Research or Ultra High Purity Helium (He) Carrier Gas: cylinder should be
equipped with a NEWUltraHighPurityRegulatorterminatingina1/4"VCRtting.
  B. HighCapacityCarrierGasPurier(recommendedforGrade5heliumorlower)
  C. 1/8"StainlessSteelTubing,PRE-CLEANED
D. Data Acquisition Software
E. AC Power Source: Series 5900: 1100 W at 115 V, 60 Hz
Series 5902: 550 W at 230 V, 50 Hz
WARNING
OPERATING INSTRUCTIONS FOR BOTH MODELS ARE THE SAME, EXCEPT
FOR LINE VOLTAGE REQUIREMENTS. TO PREVENT DAMAGE TO THE
INSTRUMENT, MAKE SURE THAT THE AC ELECTRICAL OUTLET IS THE
CORRECT VOLTAGE BEFORE PLUGGING IT INTO THE OUTLET.
DO NOT PLUG THE UNIT IN AT THIS TIME.
F. GOW-MAC P/N 59-595 Accessory Package
Package Includes:
    a) UltrahighpurityregulatorwithCGA580ttings
    b) UltrahighpurityregulatorswithCGA350ttings
    c) RegulatorwithCGA580tting
    d) Model75-800/75-802NobleGasPurier(notedonB.above)
    e) MeteringValve,1/8"
f) Four (4) helium rotameters
    g) GasketsforVCRconnections,1/8"&1/4"
h) Tygon®Tubing

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3.3 Unpacking - Inspection
A. When unpacking the instrument, check it carefully for evidence of shipping
damage or rough handling. Check to ensure that all components ordered have
either been supplied or back-ordered. Notify GOW-MAC of any discrepancies
immediately.
The packing box should be retained for use if the instrument needs to be returned
   tothefactoryforrepairormodication.GOW-MACdoes notsupplyeldservice.
ALL repairs are made at Bethlehem, PA, USA or by an authorized GOW-MAC
representative.
B. Remove all plastic and/or paper shipping caps and restraints before operating.
3.4 Location
A. The SERIES 5900 DID GC should be placed in a location that is secure, vibration-
free, protected from abrupt temperature changes (operating ambient temperature
range is 15 °C - 40 °C), and drafts. Such changes may upset the temperature
stability in the course of an analysis or preparation.
B. Enough adjacent tabletop space should be allowed for the installation of
   computers,etc.Allowsu󰀩cientspaceonallsidesoftheGCforeasyaccess.
C. Make sure that there is adequate space for the installation of the gas cylinders.
Cylinders should be securely fastened to an immoveable structure per CGA and/or
O.S.H.A. regulations.
D. An electrical outlet (AC) should be near the location where the GC will be installed.
If the outlet is not a 3-pin type, make sure that a good ground connection is
available since a good ground is necessary for proper operation. The AC outlet
should be connected to a circuit that is not heavily loaded with other electrical
equipment. Input voltage to the GC should be steady for optimum operating
stability.
If the AC line voltage varies, consideration should be given to the installation of a
stabilizing transformer at the AC outlet. An uninterruptable power supply (UPS)
with surge protection is also recommended to prevent disruption from power loss or
electrical spikes.

Series 5900 DID GC
1019, Rev. 1
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NOTE
BOTH THE GC AND THE DATA INTERFACE SHOULD BE CONNECTED TO THE SAME
DUPLEX SERVICE OUTLET TO PREVENT GROUND LOOPS.
3.5 Power Requirements
A. The SERIES 5900 DID GC requires a 120 volt/50-60 Hz power source with a
minimum of 15 amps.
B. The SERIES 5902 DID GC requires a 240 volt/50-60 Hz power source with a
minimum of 10 amps.
C. The AC power cord is terminated with a straight-blade 3-prong plug rated for
15 amp service that requires a matching receptacle.
3.6 Recorder Connection
A. Supplied with your GC is a recorder cable. Both ends of the cable terminate in
three (3) spade terminals. Cable color is as follows: RED lead, positive (+); BLACK
lead, negative (-): and SILVER (shield) lead, ground.
B. Connections
1. Connect one end of the cable to the terminals located at the rear of the GC
(FIGURE 3.1). Color connections should be made as follows:
BLACK lead to BLACK or NEGATIVE terminal
RED lead to RED or POSITIVE terminal
SILVER lead to GREEN or GROUND terminal
2.Connect the other end of the cable to the proper terminals on the data acquisition
interface.
3.7 Computing Software Connections
Consult the software operating manual for installation and operating instructions.
3.8 Hydrogen Separator or Oxygen Trap Connections (optional)
If you ordered a Hydrogen Separator or an Oxygen Trap from GOW-MAC, follow these
directions for connecting one or the other to the Series 5900 DID GC (Figure 3.3):
  Disconnectleftttingonleftcolumn.

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  Disconnectjumperfromthetwottingslocatedontheinsideoven,left.
  Connectajumperfromthe"ConnectionFROMSeparator"or"ConnectionFROM 
 Trap"ttinglocatedontheinsideoven,totheleftcolumn.
  Connectajumperfromthe"ConnectionTOSeparator"or"ConnectionTOTrap" 
 ttinglocatedontheinsideoven,lefttotheleft-mostcolumntting.
GC as Shipped
Connection
FROM
Separator/Trap
Connection
TO
Separator/Trap
Jumper
(supplied with GC)
GC with Separator or Oxy Trap Installed
Connection
FROM
Separator/Trap
Connection
TO
Separator/Trap
Jumper
(supplied with GC)
FIGURE 3.3
3.9 Gas Connections (General)
A. The SERIES 5900 DID GC requires the following gases:
    ResearchorUltraHighPurityHelium(He)orPuriedHeliumforthecarriergas
and the discharge gas
Instrument Grade Helium (He) for actuating the valve and purging the DID
housing
B. The Ultra High Purity Helium Gas cylinder should be equipped with an Ultra
High Purity Helium Regulator.

Series 5900 DID GC
1019, Rev. 1
13
The Instrument Grade Helium Gas Cylinder should be equipped with a two stage
helium regulator.
  C. Thecarriergasandsamplegasare1/4"VCRttings.Allothertubingconnections
   are1/8"compressionttings.     
D. GOW-MAC strongly encourages the use of NEW unused1/8"stainlesssteelor
inconel tubing. Contact GOW-MAC sales to inquire about purchasing new tubing,
if necessary.
1. To prevent contamination of the GC and the extremely sensitive detector from
grease, oil, or chemical residue, ALL stainless steel or inconel tubing MUST be
free of all possible contaminants PRIOR to connection to the SERIES 5900
DID GC:
a. Cut desired tubing length with a hand-held tubing cutter. DO NOT use any
     cuttingoilsormotorizedsaws.Oilscontaminateandsawscreateru󰀨edges
and burrs.
2. All tubing should be free from moisture before installation.
   3. Makeproperleaktestonallttings.
NOTE
IT IS HIGHLY RECOMMENDED THAT A GOW-MAC GAS LEAK DETECTOR
BE USED TO LEAK TEST THE SYSTEM. USE OF SOAP SOLUTIONS IS NOT
RECOMMENDED SINCE IT WILL CONTAMINATE THE SYSTEM.

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Gas
Purifier
C
A
R
R
I
E
R
G
A
S
Helium
New High
Purity Regulator
100
psig
P
U
R
G
E
G
A
S
Helium
80 psig
S
A
M
P
L
E
G
A
S
15
psig
FIGURE 3.4
3.10 Carrier Gas Purity
The SERIES 5900 DID GC is an instrument which can determine impurities in helium
at the part-per-billion level. However, in order to reach this level of sensitivity,
EXTREME care must be taken to ensure that there are no leaks in the system and
that the carrier gas is as pure as can possibly be.
If for some reason the carrier gas is not as pure as the sample gas, negative peaks
can occur for gases which are in lower concentration in the sample gas. By using a
 carriergaspurier(GOW-MACModel75-800)intheheliumline,instrumentgrade 
 heliumcanbepuriedtoalevelcleanerthanchromatographicgradehelium.
NOTE
IT IS HIGHLY RECOMMENDED THAT IF A PURIFIER WAS PURCHASED, THE
OPERATOR READ THE GAS PURIFIER OPERATING INSTRUCTIONS.
 Topreventlowlevelimpuritiesfromappearinginthebaseline,thepuriermustbe 
heated. Refer to the manufacturer’s instructions.
3.11 Purge/Actuator Gas Adjustment
NOTE
ACTUATORS REQUIRE 40 TO 50 PSIG TO OPERATE. MAKE SURE THIS
PRESSURE IS SUPPLIED AT THE ‘PURGE/ACT. HE’ GAS CONNECTION
ON THE BACK OF THE INSTRUMENT.

Series 5900 DID GC
1019, Rev. 1
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A. The Purge Helium control valve found in front of the instrument oven section is a
combinationhighowandlowowmeteringvalve,knownasacombovalve.The
outerknurledknobcontrolsthehighowcontrolfunctionandthescrewdriver-
adjustableinnerknobcontrolsneowmetering.
  B.TurnONtheinstrumentgradeheliumgasowattheregulator.Thisowisfactory
adjusted and should be set to 30 mL/min. for continuous operation after the air has
been purged from the system. If adjustment is needed:
  1. Opentheoutsidecombovalveknob(counterclockwise)togetfastpurgeow.
Theinsideknobcanbeinanypositionandwillnota󰀨ectfastpurgeow.
2. Fast purge for about one (1) minute, then turn the outer knob clockwise all the
waytoshuto󰀨thefastow.
  3. Adjustthelow(operating)purgeowto30mL/minusingtheinnerknob.Typical
lowowpurgetimerequiredbeforeanalysisis12to24hours.
3.12 Carrier Gas Flow Adjustment
A. This instrument is equipped with a maximum of six (6) bellows metering
   valves.Theyareusedtosetcarrierowsthroughthecolumnsandsystem.For
   makinginitialowadjustments,allvalvesshouldbeinthecounterclockwise 
starting positions (blue color on LCD display).
B. Turn the Helium carrier ONattheregulator.AllowCARRIERtoowfor
    aboutone(1)hourtopurgeairoutofsystem.Theoperatormustreferencetheow
   systemdrawingspecicfortheSERIES5900model.
  C.CARRIER1owrateshouldbesettoread30mL/min.fromtherotameter(located
on the front of the GC) when the 4 port Sample Isolation Valve is in the CARRIER
   position.AdjustowbymanipulatingCARRIER1MeteringValve.
  D. Tu r n S a m p le I s o l at i o n Va l v e to S A M P L E a n d s et  o w ra te by a dj u st i n g th e m et e r i n g 
valve in the SAMPLE supply line (supplied in GOW-MAC Accessory Package #59-
595).
Sample Isolation Valve should be kept in the CARRIER position except for when
making an injection. This keeps the sample gas from penetrating the Injection
Valve rotor and causing sample cross contamination.
E. Turn OFF theDETECTORGASowratebyusingtheDETECTORGAS
BELLOWS METERING VALVE (DETECTOR HELIUM) on the front of the GC.

GOW-MAC Instrument Co.
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  F.MeasuretheowsfromthevariousDETECTOROUTLETonthebackofthe
    5900andsetthecarrierowratesto30mL/min.usingthebellows  
metering valves located on the front of the GC. This will need to be repeated
for each carrier path.
  G.Boththecolumne󰀪uentandthedetectorgasaremeasuredfromthesame 
   tting,therefore,theyMUSTbemeasuredsequentially.Adjusttheowrate 
   to30mL/min.(for1/8"columns).Next, ADD 10 mL/min. DETECTOR HELIUM
with DETECTOR HELIUM BELLOWS VALVE for a total of 40 mL/min. exiting
the DETECTOR OUTLET.
  H. SwitchthenalvalvegoingtotheDIDandresetowsasperprocedure 
above.
3.13 Leak Check
  A. Afterallconnectionshavebeenmadeandthegasesareowing,itisVERY
IMPORTANT that they be tight and free from leaks. Leaks in the carrier gas lines
will cause baseline drift, noise, and will interfere with the extremely sensitive DID
(contamination).
CAUTION
A LEAK CHECK SHOULD BE MADE OF THE ENTIRE GC SYSTEM
PRIOR TO INSTRUMENT OPERATION.
B. Areas To Check
1. Column connections. Check at the small holes in the VCR nuts.
    2.Carriergas&dischargegasconnectionsattherearoftheGC.
3. Sample gas connection at the front of the GC.
4. All connections made at the gas cylinders.
NOTE
LEAK CHECKS SHOULD BE RUN PERIODICALLY AND ARE A MUST WHEN
NEW COLUMNS ARE INSTALLED OR GAS CONNECTIONS ARE MADE.

Series 5900 DID GC
1019, Rev. 1
17
SECTION 4 - OPERATING CONTROLS
4.1 Controls
A. With the exception of the MAIN POWER SWITCH, all of the operating controls
are located on the LCD Digital Touchscreen. The operator should become very
familiar with these controls and their functions BEFORE operating the instrument.
Refer to FIGURE 4.1.
1. DID HV – The Discharge Ionization Detector High Voltage can be set using
this box. The normal operating range is 525 – 600 V and will increase to 800 V
to “spark” the arc.
2. DID ImA – This is the Discharge Current for the DID. This is a read-only
display.
3. POL VOLT: Sets the polarization voltage of the detector. Normal is 160 V or
increased voltage to approximately 250 V for neon impurity analysis.
4. DID SIG – The output signal to data collection (mV). This is a read-only
display.
5. VALVE CONTROLS – Blue indicates counter-clockwise (CCW) position and
Green indicates clockwise (CW) position.
6. COLUMN TEMP - Sets and reads the temperature of the column oven.
7. DETECTOR TEMP – Sets and reads the temperature of the detector.
8. DID ZERO:Adjuststhesignalo󰀨setinordertoestablishthebaselineposition
on the recorder.
9. OFFSET –Setsadesiredbaselineo󰀨setoverzero.
10. IGNITE – Increases the DID voltage to 800 V to ignite the polarization. DID
should run at 525 – 600 V once lit.
11. RANGE-Adjuststheamplicationoftheelectrometerbyafactorof10. 
Range 1 (R1) is the most sensitive decreasing to Range 4 (R4) being the least
sensitive and ideal starting point.
12. GAIN ADJUST-Adjuststheamplicationoftherange.Gain1istheleast
sensitive while Gain 4 is the most sensitive.
13. EXTERNAL VALVE (ON/OFF) – This allows the operator to control the valves
    fromthetouchscreen(o󰀨)orcontrolthevalvesusingsoftwarewithcontact
closure controls (on).
14. SHUTDOWN–Thiswillturno󰀨theLCDdigitaldisplayandshutdownthe 
    displayinpreparationofpoweringo󰀨theinstrument.
NOTE
A KEYPAD WILL POP UP WHEN THE FOLLOWING ENTRY BOXES ARE PRESSED:
DID HV, POL VOLT, COLUMN TEMP, DETECTOR TEMP AND OFFSET BASELINE.
THE NUMERIC VALUE MUST BE KEYED IN AND ENTER MUST BE PRESSED TO
ACCEPT THE SET POINT. PRESS OK WHEN FINISHED TO EXIT AND CLOSE THE
KEYPAD

GOW-MAC Instrument Co.
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FIG URE 4.1
Connections:
 Outputwiresareconnectedbetweeneither(1)&(GND)or(2)&(GND)orboth.Theseare
the output wires on your chromatography package. [Refer to chromatography package
instructions]
4.2 Power&RecorderConnections
A. Power Switch with Fuse: This protects the entire instrument from AC voltage
malfunctions. Should power fail to remain ON, remove power cord from AC outlet
and check for shorted fuse.
B . Service Cord: This power cord should be plugged into a grounded receptacle. If
grounded receptacle is not available, use a three/two adapter but make sure that
the ground lead is attached to the screw on the receptacle plate.
4.3 Columns
  TheSERIES5900DIDGCcomesequippedwithanalyticalcolumnsforaspecied
application.

Series 5900 DID GC
1019, Rev. 1
19
NOTE
COLUMNS SUPPLIED ARE CONDITIONED. PROPER COLUMN CONDITIONING
PROCEDURES SHOULD BE OBSERVED BEFORE ANALYSIS IS PERFORMED.
CARE SHOULD BE TAKEN DURING CONDITIONING SO CONTAMINATION OF THE
DETECTOR DOES NOT OCCUR. REFER TO SECTION 6.1,D FOR PROPER COLUMN
CONDITIONING PROCEDURE.
7
65
432
9
1
11
8
10
FIGURE 4.2
1. LCD Digital Touchscreen Display
2. Detector Helium Metering Valve
3. Carrier 1 Metering Valve
4. Carrier 2 Metering Valve
5. Carrier 3 Metering Valve
6. Carrier 4 Metering Valve
7. Carrier 5 Metering Valve
8. Purge Helium Valve
9. Oven Lid
10. Sample Inlet (Optional) (Back Panel Standard)
11. Sample Out Rotameter

GOW-MAC Instrument Co.
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4.4 BackPanel(mostttingsare1/8"compressionttings)
1. PURGE IN/ACTUATOR CONNECTION
2. VENT 4
3. VENT 3
4. VENT 2
5. DETECTOR OUT
   6.  CARRIERIN(VCRtting,1/4")
7. PURGE OUT
8. VENT 1
9. SAMPLE OUT
10. SAMPLE IN
11. From Separator (optional)
12. To Separator (optional)
13. Valve Control (9-pin serial connection)
14. I/D Connection (25-pin serial connection)
15. Ethernet connection
16. USB connection
17. Power
18. Recorder Output
1 2 3 4 5 6 7 8 9 10
11 12
15 16
17
18
+
-
G
13
14
FIGURE 4.3