Hach 3654 User Manual
Operator Manual
ORBISPHERE 3654
Revision H - 14/03/2008
3654 Portable H2/N2 Analyzer - Important Information
Operator Manual
ORBISPHERE
Product Recycling Information
ENGLISH
Electrical equipment marked with this symbol may not be disposed of in European public
disposal systems after 12 August 2005. In conformity with European local and national
regulations (EU Directive 2002/96/EC), European electrical equipment users must now
return old or end-of-life equipment to the manufacturer for disposal at no charge to the
user.
Note: For return for recycling, please contact the equipment manufacturer or supplier for
instructions on how to return end-of-life equipment for proper disposal.
DEUTSCH
Elektrogeräte, die mit diesem Symbol gekennzeichnet sind, dürfen in Europa nach dem 12. August 2005
nicht mehr über die öffentliche Abfallentsorgung entsorgt werden. In Übereinstimmung mit lokalen und
nationalen europäischen Bestimmungen (EU-Richtlinie 2002/96/EC), müssen Benutzer von
Elektrogeräten in Europa ab diesem Zeitpunkt alte bzw. zu verschrottende Geräte zur Entsorgung
kostenfrei an den Hersteller zurückgeben.
Hinweis: Bitte wenden Sie sich an den Hersteller bzw. an den Händler, von dem Sie das Gerät bezogen
haben, um Informationen zur Rückgabe des Altgeräts zur ordnungsgemäßen Entsorgung zu erhalten.
FRANCAIS
A partir du 12 août 2005, il est interdit de mettre au rebut le matériel électrique marqué de ce symbole par
les voies habituelles de déchetterie publique. Conformément à la réglementation européenne (directive
UE 2002/96/EC), les utilisateurs de matériel électrique en Europe doivent désormais retourner le matériel
usé ou périmé au fabricant pour élimination, sans frais pour l'utilisateur.
Remarque: Veuillez vous adresser au fabricant ou au fournisseur du matériel pour les instructions de
retour du matériel usé ou périmé aux fins d'élimination conforme.
ITALIANO
Le apparecchiature elettriche con apposto questo simbolo non possono essere smaltite nelle discariche
pubbliche europee successivamente al 12 agosto 2005. In conformità alle normative europee locali e
nazionali (Direttiva UE 2002/96/EC), gli utilizzatori europei di apparecchiature elettriche devono restituire
al produttore le apparecchiature vecchie o a fine vita per lo smaltimento senza alcun costo a carico
dell’utilizzatore.
Nota: Per conoscere le modalità di restituzione delle apparecchiature a fine vita da riciclare, contattare il
produttore o il fornitore dell’apparecchiatura per un corretto smaltimento.
DANSK
Elektriske apparater, der er mærket med dette symbol, må ikke bortskaffes i europæiske offentlige
affaldssystemer efter den 12. august 2005. I henhold til europæiske lokale og nationale regler (EUdirektiv 2002/96/EF) skal europæiske brugere af elektriske apparater nu returnere gamle eller udtjente
apparater til producenten med henblik på bortskaffelse uden omkostninger for brugeren.
Bemærk: I forbindelse med returnering til genbrug skal du kontakte producenten eller leverandøren af
apparatet for at få instruktioner om, hvordan udtjente apparater bortskaffes korrekt.
Important Information - 3654 Portable H2/N2 Analyzer
Operator Manual
ORBISPHERE
SVENSKA
Elektronikutrustning som är märkt med denna symbol kanske inte kan lämnas in på europeiska offentliga
sopstationer efter 2005-08-12. Enligt europeiska lokala och nationella föreskrifter (EU-direktiv 2002/96/
EC) måste användare av elektronikutrustning i Europa nu återlämna gammal eller utrangerad utrustning
till tillverkaren för kassering utan kostnad för användaren.
Obs! Om du ska återlämna utrustning för återvinning ska du kontakta tillverkaren av utrustningen eller
återförsäljaren för att få anvisningar om hur du återlämnar kasserad utrustning för att den ska bortskaffas
på rätt sätt.
ESPANOL
A partir del 12 de agosto de 2005, los equipos eléctricos que lleven este símbolo no deberán ser
desechados en los puntos limpios europeos. De conformidad con las normativas europeas locales y
nacionales (Directiva de la UE 2002/96/EC), a partir de esa fecha, los usuarios europeos de equipos
eléctricos deberán devolver los equipos usados u obsoletos al fabricante de los mismos para su
reciclado, sin coste alguno para el usuario.
Nota: Sírvase ponerse en contacto con el fabricante o proveedor de los equipos para solicitar
instrucciones sobre cómo devolver los equipos obsoletos para su correcto reciclado.
NEDERLANDS
Elektrische apparatuur die is voorzien van dit symbool mag na 12 augustus 2005 niet meer worden
afgevoerd naar Europese openbare afvalsystemen. Conform Europese lokale en nationale wetgegeving
(EU-richtlijn 2002/96/EC) dienen gebruikers van elektrische apparaten voortaan hun oude of afgedankte
apparatuur kosteloos voor recycling of vernietiging naar de producent terug te brengen.
Nota: Als u apparatuur voor recycling terugbrengt, moet u contact opnemen met de producent of
leverancier voor instructies voor het terugbrengen van de afgedankte apparatuur voor een juiste
verwerking.
POLSKI
Sprzęt elektryczny oznaczony takim symbolem nie może być likwidowany w europejskich systemach
utylizacji po dniu 12 sierpnia 2005. Zgodnie z europejskimi, lokalnymi i państwowymi przepisami prawa
(Dyrektywa Unii Europejskiej 2002/96/EC), użytkownicy sprzętu elektrycznego w Europie muszą obecie
przekazywać Producentowi stary sprzęt lub sprzęt po okresie użytkowania do bezpłatnej utylizacji.
Uwaga: Aby przekazać sprzęt do recyklingu, należy zwrócić się do producenta lub dostawcy sprzętu w
celu uzyskania instrukcji dotyczących procedur przekazywania do utylizacji sprzętu po okresie użytkow-
nia.
PORTUGUES
Qualquer equipamento eléctrico que ostente este símbolo não poderá ser eliminado através dos
sistemas públicos europeus de tratamento de resíduos sólidos a partir de 12 de Agosto de 2005. De
acordo com as normas locais e europeias (Directiva Europeia 2002/96/EC), os utilizadores europeus de
equipamentos eléctricos deverão agora devolver os seus equipamentos velhos ou em fim de vida ao
produtor para o respectivo tratamento sem quaisquer custos para o utilizador.
Nota: No que toca à devolução para reciclagem, por favor, contacte o produtor ou fornecedor do
equipamento para instruções de devolução de equipamento em fim de vida para a sua correcta
eliminação.
3654 Portable H2/N2 Analyzer - Important Information
Operator Manual
ORBISPHERE
Note:
Product Disposal
The following only applies to European customers.
Hach Ultra is committed to ensuring that the risk of any environmental damage or
pollution caused by any of its products is minimized as far as possible. The European
Waste Electrical and Electronic Equipment (WEEE) Directive (2002/96/EC) that came
into force on August 13 2005 aims to reduce the waste arising from electrical and
electronic equipment; and improve the environmental performance of all those involved
in the life cycle of electrical and electronic equipment.
In conformity with European local and national regulations (EU Directive 2002/96/EC
stated above), electrical equipment marked with the above symbol may not be disposed
of in European public disposal systems after 12 August 2005.
Hach Ultra will offer to take back (free of charge to the customer) any old,
unserviceable or redundant analyzers and systems which carry the above symbol, and
which were originally supplied by Hach Ultra. Hach Ultra will then be responsible for the
disposal of this equipment.
In addition, Hach Ultra will offer to take back (at cost to the customer) any old,
unserviceable or redundant analyzers and systems which do not carry the above symbol,
but which were originally supplied by Hach Ultra. Hach Ultra will then be responsible for
the disposal of this equipment.
Should you wish to arrange for the disposal of any piece of equipment originally supplied
by Hach Ultra, please contact your supplier or our After Sales Service department in
Geneva for instructions on how to return this equipment for proper disposal.
Operator Manual
ORBISPHERE
Restriction of Hazardous Substances
Note:
The following only applies to exports of the product into the People’s Republic of China.
Marking
Products contain toxic or hazardous substances or elements.
Environment Protection Use Period Marking (years).
Toxic or Hazardous Substances and Elements
Important Information - 3654 Portable H2/N2 Analyzer
Hexavalent
Lead
Part Name
1184 Board X
1112 Analog Board X
Spacer X
External Connector X
O: Indicates that this toxic or hazardous substance contained in all homogeneous material for
this part is below the limit requirement
X: Indicates that this toxic or hazardous substance contained in at least one of the
homogeneous materials used for this part is above the limit requirement
(Pb)
Mercury
(Hg)
Cadmium
(Cd)
Chromium
(Cr VI)
Polybrom
Biphenyls
(PBB)
Polybrom
Diphenyls
(PBDE)
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ORBISPHERE
Table of Contents
1 Installation
1.1 What you have Received.....................................................................9
1.2 WIN3654 PC Program Installation.....................................................10
1.3 Atmospheric Pressure Equilibrium ....................................................10
1.4 Sensor Installation.............................................................................10
1.5 Purge Gas Connection ......................................................................11
1.6 Connections.......................................................................................11
1.6.1 External Power Supply (optional) ........................................11
1.6.2 Instrument - PC Connection ................................................11
1.7 Flow Chamber Installation.................................................................13
1.8 Installation Completion Check List ....................................................14
1.8.1 Power ..................................................................................14
1.8.2 Check the Purge Gas Supply ..............................................14
1.8.3 Instrument Clock Setting .....................................................14
1.8.4 Barometric Pressure Setting................................................14
1.8.5 Sensor Membrane...............................................................14
1.8.6 Flow Chamber .....................................................................15
2 Operating Instructions
2.1 Operating Controls ............................................................................17
2.2 Taking Measurements.......................................................................19
2.2.1 Select Gas Measurement Phase.........................................19
2.2.2 Measurement Mode.............................................................19
2.3 Storing Measurements In the Instrument ..........................................20
2.3.1 Automatic Data Acquisition..................................................20
2.3.2 Manual Data Acquisition......................................................21
2.3.3 Viewing Stored Measurements............................................22
2.4 Storing and Accessing Measurements From a Computer.................22
2.4.1 Downloading Stored Values ................................................22
2.4.2 Altering the Sampling Point Descriptions ............................23
2.4.3 Copying Values ...................................................................23
2.4.4 Saving Values......................................................................23
2.4.5 Printing Values ....................................................................24
2.4.6 Clearing Stored Values........................................................24
2.5 Monitoring Measurements In Real-Time ...........................................25
2.6 After Use and Storage.......................................................................26
3 Options Setup
3.1 Main Menu Basics .............................................................................27
3.2 Analyzer - PC Connection .................................................................29
3.3 Reviewing Instrument Configuration..................................................29
3.4 Configuring the Instrument ................................................................29
3.4.1 Gas Measurement Phase....................................................29
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3.4.2 Measurement Units..............................................................30
3.4.3 Membrane Selection............................................................31
3.4.4 Automatic Data Acquisition - Setting Sampling Intervals.....31
3.4.5 Calibration Medium..............................................................32
3.4.6 Locking Out the Instrument’s CAL Button............................32
3.4.7 Rolling Average....................................................................32
3.4.8 Automatic Shutdown............................................................33
3.4.9 Measurement Mode.............................................................33
4 Calibrations
4.1 Barometric Pressure Sensor Calibration ...........................................35
4.2 Sensor Calibration .............................................................................36
4.2.1 Calibration Setup .................................................................37
4.2.2 Calibration In H
4.2.3 Calibration In H
4.2.4 Calibrating In a Liquid H
or N2 at Atmospheric Pressure.................38
2
or N2 at Elevated Pressure.......................39
2
or N2 Solution..............................40
2
5 Accessories and Attachments
5.1 Model 32311 Flow Meter ...................................................................41
5.2 Model 32939 External Power Supply.................................................42
6 Maintenance and Troubleshooting
6.1 Power Supply.....................................................................................43
6.2 Sensor Maintenance..........................................................................43
6.2.1 Maintenance Schedule ........................................................43
6.2.2 Testing the Sensor Condition...............................................43
6.2.3 Mounting Dual Membranes..................................................44
6.3 Membrane Replacement ...................................................................44
6.3.1 Removing the Membrane.....................................................44
6.3.2 Installing the Membrane.......................................................45
6.4 Purge Gas Cylinder Refill ..................................................................48
6.4.1 N
6.4.2 CO
6.4.3 Filling the Purge Gas Cylinder .............................................49
6.5 Troubleshooting - Instrument.............................................................50
6.5.1 Serial Test............................................................................50
6.5.2 Keyboard Test .....................................................................50
6.5.3 Display Test .........................................................................51
6.5.4 Clock Settings......................................................................51
6.5.5 Analog Voltages View..........................................................52
6.5.6 Measurements View ............................................................52
6.6 Troubleshooting - Operation..............................................................53
6.6.1 Program Identification..........................................................53
6.6.2 Diagnostics Messages.........................................................53
6.6.3 Continuous Purge ................................................................53
6.6.4 Troubleshooting Table .........................................................54
Purge Gas.......................................................................48
2
Purge Gas....................................................................49
2
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ORBISPHERE
7 Specifications
7.1 Instrument Specifications ..................................................................55
7.2 Sensor Specifications........................................................................56
8 Part Lists
8.1 Instrument Configurations .................................................................59
8.2 TC Sensor and Parts on Configured System ....................................59
8.3 Analyzer Spare Parts.........................................................................59
8.4 Sensor Spare Parts ...........................................................................60
Appendix A: Glossary
A.1 Common Units...................................................................................61
A.2 Terms and Definitions........................................................................61
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3654 Portable H2/N2 Analyzer - Manual Overview 5 of 66
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ORBISPHERE
WARNING
CAUTION:
Note:
Manual Overview
About this Manual
The information in this manual has been carefully checked and is believed to be
accurate. However, Hach Ultra assumes no responsibility for any inaccuracies that may
be contained in this manual. In no event will Hach Ultra be liable for direct, indirect,
special, incidental, or consequential damages resulting from any defect or omission in
this manual, even if advised of the possibility of such damages. In the interest of
continued product development, Hach Ultra reserves the right to make improvements in
this manual and the products it describes at any time, without notice or obligation.
Published in Europe.
Copyright © 2006 by Hach Ultra. All rights reserved. No part of the contents of this
manual may be reproduced or transmitted in any form or by any means without the
written permission of Hach Ultra.
Revision History
• Initial Release, November 1998, Orbisphere
• Revision A, April 2000, Orbisphere
• Revision B, July 2001, Orbisphere
• Revision C, July 2002, Orbisphere
• Revision D, October 2003, Hach Ultra Analytics
• Revision E, May 2004, Hach Ultra Analytics
• Revision F, February 2006, Hach Ultra
• Revision G, May 2007, Hach Ultra
• Revision H, July 2007, Hach Ultra
Safety Conventions
A warning is used to indicate a condition which, if not met, could cause serious personal
injury and/or death. Do not move beyond a warning until all conditions have been met.
A caution is used to indicate a condition which, if not met, could cause minor or
moderate personal injury and/or damage to the equipment. Do not move beyond a
caution until all conditions have been met.
A note is used to indicate important information or instructions that should be considered
before operating the equipment.
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ORBISPHERE
Safety Precautions
Please read the entire manual before unpacking, setting up, or operating this instrument.
Pay particular attention to all warning and caution statements. Failure to do so could
result in serious injury to the operator or damage to the equipment.
To ensure the protection provided by this equipment is not impaired, do not use or install
this equipment in any manner other than that which is specified in this manual.
Safety Recommendations
For safe operation, it is imperative that these service instructions be read before use and
that the safety recommendations mentioned herein be scrupulously respected. If danger
warnings are not heeded to, serious material or bodily injury could occur.
Service and Repairs
None of the instrument’s components can be serviced by the user. Only personnel from
Hach Ultra or its approved representative(s) is (are) authorized to attempt repairs to the
system and only components formally approved by the manufacturer should be used.
Any attempt at repairing the instrument in contravention of these principles could cause
damage to the instrument and corporal injury to the person carrying out the repair. It
renders the warranty null and void and could compromise the correct working of the
instrument and the electrical integrity or the CE compliance of the instrument.
If you have any problems with installation, starting, or using the instrument please
contact the company that sold it to you. If this is not possible, or if the results of this
approach are not satisfactory, please contact the manufacturer’s Customer Service.
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ORBISPHERE
Precautionary Labels
Read all labels and tags attached to the instrument. Personal injury or damage to the
instrument could occur if not observed.
This symbol, when noted on a product enclosure or barrier, indicates that a risk of
electrical shock and/or electrocution exists and indicates that only individuals
qualified to work with hazardous voltages should open the enclosure or remove
the barrier.
This symbol, when noted on the product, indicates that the marked item can be hot
and should not be touched without care.
This symbol, when noted on the product, indicates the presence of devices
sensitive to electrostatic discharge and indicates that care must be taken to
prevent damage to them.
This symbol, when noted on the product, identifies a risk of chemical harm and
indicates that only individuals qualified and trained to work with chemicals should
handle chemicals or perform maintenance on chemical delivery systems
associated with the equipment.
This symbol, if noted on the product, indicates the need for protective eye wear.
This symbol, when noted on the product, identifies the location of the connection
for protective earth (ground).
Electrical equipment marked with this symbol may not be disposed of in European
public disposal systems. In conformity with European local and national
regulations, European electrical equipment users must now return old or
end-of-life equipment to the manufacturer for disposal at no charge to the user.
Products marked with this symbol indicates that the product contains toxic or
hazardous substances or elements. The number inside the symbol indicates the
environmental protection use period in years.
Acknowledgements
• Dacron, Delrin, Tedlar, Tefzel, and Viton are registered trademarks of DuPont.
• Halar is a registered trademark of Ausimont U.S.A., Inc.
• Hastelloy is a registered trademark of Haynes International.
• Kynar is a registered trademark of The Pennwalt Corporation.
• Monel is a registered trademark of IMCO Alloys International, Inc.
• Saran is a registered trademark of Dow Chemical Co.
• Swagelok is a registered trademark of Swagelok Co.
• Microsoft and Windows are registered trademarks of Microsoft Corporation.
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ORBISPHERE
1 Installation
This section provides necessary information to set up the instrument. If you have any
questions or experience any difficulties, do not hesitate to contact your Hach Ultra
representative regarding this procedure.
1.1 What you have Received
The ORBISPHERE 3654 portable analyzer includes the following major components:
• An instrument, model 3654/xxx, with keypad, display, and handle.
• A membrane-covered thermal conductivity (TC) sensor, either model 3127x for H
measurement or model 31570 for N
• A flow chamber, either model 32013A with flow adjustment valve for N
or model 32015 without flow adjustment valve for H
• A WIN3654 program on a CD with a PC communications cable.
Also included with your shipment are two C-type batteries, a recharge kit in a plastic case
containing materials to maintain your sensor and a model 32824A refilling hose to refill
the purge gas cylinder
measurement.
2
analyzers.
2
analyzers,
2
2
Fig 1-1:
ORBISPHERE 3654 Portable Analyzer
Locate the instrument close to the sample being analyzed, and to the Personal Computer
(PC) if one is being used. A LEMO-6 connector for RS-232 serial output to a PC is on the
right side of the instrument (see Fig 1-1 above).
Make sure you install a fully charged set of batteries, or connect the instrument to an
external power source (see “External Power Supply (optional)” on page 11), before
switching the instrument on and exposing the sensor’s membrane to any liquid.
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ORBISPHERE
1.2 WIN3654 PC Program Installation
Install the WIN3654 program onto the PC by inserting the accompanying CD into your
PC and running the SetUp program. Simply follow the on-screen instructions.
When finished, a new Windows Program Group labeled Orbisphere is created
containing the software and help files.
1.3 Atmospheric Pressure Equilibrium
As soon as you receive the instrument, it will be necessary to ensure the interior and
exterior of the instrument are both at the same atmospheric pressure. It is probable that
during shipment these pressures will become different.
To ensure the pressures are equal, simply press the relief valve switch located on the top
of the instrument (see Fig 1-1 on page 9) and hold it down for about 5 seconds before
releasing.
1.4 Sensor Installation
The TC sensor connects to the instrument base through a 10-pin LEMO connector. A
locking pin holds the sensor in place.
Fig 1-2:
Both the membrane-covered TC sensor and the flow chamber are shipped pre-installed
on the instrument. It will, however, be necessary to remove the flow chamber when
servicing the sensor. For details refer to “Sensor Maintenance” on page 43.
TC Sensor - Exploded View
3654 Portable H2/N2 Analyzer - Installation 11 o f 6 6
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ORBISPHERE
Note:
Note:
Note:
1.5 Purge Gas Connection
It is critical that the TC sensor has a supply of purge gas running before operating the
system. The TC sensor, when exposed to a liquid sample, will become damaged if the
purge gas is not running.
CO
is used to purge the N2 sensor and N2 or CO2 is used to purge the H2 sensor. A
2
cylinder located at the bottom of the instrument supplies the purge gas. This cylinder is
refillable (see “Purge Gas Cylinder Refill” on page 48).
The TC sensor is purged cyclically. In measurement mode, a cycle consists of a 4
second purge followed by 16 seconds of measurement. When the instrument is in
standby, the purge time is the same, followed by a 17 minute delay. During the purge
time, the flow rate varies, depending on the pressure inside the cylinder. At least four
bubbles should exit from the purge gas exit during the purge time.
The purge gas input to the sensor uses a Tygon tube (4 mm outside/2 mm inside
diameter, 110 mm long) that attaches to the base of the sensor. Refer to the exploded
sensor diagram in Fig 1-2 on page 10.
The hole in the side and near the base of the sensor is the purge gas exit. To check the
purge gas flow rate, push the supplied nylon tubing into this hole, to its limit. To
disconnect it again, press on the ring surrounding the tube and pull out.
To check the purge gas flow rate, immerse the end of this tubing in water and switch on
the instrument. Gas should flow intermittently out of the tube.
During normal operation, and especially when the instrument is in standby mode,
ensure that the exit of the purge gas tube is exposed to the atmosphere and not in
contact with any liquid or hard surface.
1.6 Connections
1.6.1 External Power Supply (optional)
The instrument is usually powered by the batteries supplied. You can, however, power it
from an external power source using the model 32939 power supply adaptor as
described and illustrated in “Model 32939 External Power Supply” on page 42.
Connect the male LEMO-6 plug on the 32939, to the RS-232 connector on the right side
of the instrument. The female LEMO-6 plug can then be used to connect to your PC (if
required) using the standard RS-232 cable supplied with the instrument.
Plug the transformer into your mains power supply using the cable supplied.
If the external power supply is not clean, this may result in unstable measurements.
1.6.2 Instrument - PC Connection
An RS-232 cable is supplied with the instrument, with a 6-pin LEMO plug on one end and
a 9-pin D-Type plug on the other.
If you use an adapter for the connection to the PC, make sure it is designed for this
purpose and, thus, has all nine pins accessible. Some 25-to-9 pin adapters are supplied
for specific use, such as a mouse, and these may have only certain pins available.
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ORBISPHERE
Pin RS232 Signal
Pin 1 Transmitted data (TXD)
Pin 2 Received data (RXD)
Pin 3 Not Used
Pin 4 Not Used
Pin 5 Not Used
Pin 6 Ground
Pin Use
Pin 1 Not Used
Pin 2 RS-232 Transmitted Data (TXD)
Pin 3 RS-232 Received Data (RXD)
Pin 4 Not Used
Pin 5 Ground
Pin 6 Not Used
Pin 7 Not Used
Pin 8 Not Used
Pin 9 Not Used
It is not necessary to keep the PC connected to the instrument during measurement. This
connection is required for downloading stored measurements, real-time monitoring,
reviewing and changing configuration parameters and testing the instrument from the PC
(see “Troubleshooting - Instrument” on page 50 for details).
Fig 1-3:
Interface Box Connections
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ORBISPHERE
CAUTION:
1.7 Flow Chamber Installation
The model 32013A or 32015 flow chamber allows the liquid or gaseous sample past the
TC and temperature sensors. The flow chamber attaches to the TC sensor with a
threaded collar and is sealed to the sensor with two O-rings (EPDM
∅4x1.5 mm).
At the top of the TC sensor is a thermistor to measure the sample temperature. Do not
bend or damage this component.
∅20x2 mm and NBR
Fig 1-4:
Flow Chamber 32013A
The flow chamber’s inlet and outlet use ¼-inch diameter transparent plastic tubing.
Connect by compression fittings to the sample source and to the drain, respectively.
You may also have received a model 32051 sample tube adapter to attach the flow
chamber inlet tubing to the sampling point (see “WIN3654 PC Program Installation” on
page 10).
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ORBISPHERE
Note:
1.8 Installation Completion Check List
1.8.1 Power
The instrument is designed to work on battery power or an external power supply.
If battery power should drop, a [LO BAT] warning appears in the instrument LCD's top
left corner, and they should be replaced.
If using an external power supply, ensure that this is clean, otherwise it may result in
unstable measurements.
1.8.2 Check the Purge Gas Supply
It is critical that the TC sensor has a supply of purge gas before operating the system.
The TC sensor, when exposed to a liquid sample, could be damaged if the instrument
purge gas cylinder is empty. At the same time, it is also critical that the instrument has a
power supply to ensure the purge gas is supplied to the sensor on a regular basis. The
system purges the sensor for 4 seconds every 20 seconds during normal measurement
mode, and every 17 minutes during standby mode.
A small, pressurized cylinder at the bottom of the instrument supplies purge gas to the
sensor. The purge gas required is:
•N
purge for H2 measurements.
2
•CO
Verify that the purge gas is flowing at more than four bubbles during the purge cycle, by
placing the purge gas exit tubing into water.
You must supply power constantly to the instrument, since it purges the sensor
continuously while power is on. When you put the instrument in standby, it still maintains
the purge gas supply to the sensor. Thus, make certain to supply battery or optional
external DC power constantly if the instrument is in standby and the sensor is exposed
to a sample. The batteries will provide about three weeks of power for purging while the
instrument is off.
purge for N2 or H2 measurements.
2
1.8.3 Instrument Clock Setting
If you use the instrument to store measurements for downloading to a PC, you should
verify the date and time settings of the instrument's internal clock, as described in “Clock
Settings” on page 51.
1.8.4 Barometric Pressure Setting
The internal barometric pressure sensor has been factory calibrated but should be
verified on-site with a precision certified barometer, and corrected if necessary. For
instructions on how to do this, please refer to “Barometric Pressure Sensor Calibration”
on page 35.
1.8.5 Sensor Membrane
Check that the membrane has been installed correctly, and is flat, tight, and wrinkle free.
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1.8.6 Flow Chamber
The flow chamber inlet and outlet should be free of any obstructions. The model 32013A
flow chamber, for dissolved N
The model 32015 flow chamber for H
Dissolved Gas Measurements
Adjust the sample flow rate using the needle valve on the exit. When analyzing
carbonated beverages, sufficient pressure must be provided to avoid degassing of the
beverage during its passage through the flow chamber. Check for the absence of
bubbles in the inlet tubing.
Gaseous Measurements
Place the outlet tubing in a container of water, ensuring that the flow chamber outlet is
unobstructed (on the 32013A flow chamber, open the outlet valve completely). Then,
adjust the inlet sample flow valve (main supply) to obtain one bubble per second at the
outlet.
measurements, has a flow adjustment valve on the outlet.
2
measurements has no valve.
2
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