Microtrac S3500 User manual

Microtrac S3500 Particle Size Analyzer
Operation and Maintenance Manual
OM0006
1/04

ii Microtrac S3500 Particle Size Analyzer Operation and Maintenance 9/03
Copyright, Notices, and Trademarks
Printed in U.S.A. – © Copyright 2004 by Microtrac Inc.
1/04
While this information is presented in good faith and believed to be accurate, Microtrac disclaims
the implied warranties of merchantability and fitness for a particular purpose and makes no
express warranties except as may be stated in its written agreement with and for its customer.
In no event is Microtrac liable to anyone for any indirect, special or consequential damages. The
information and specifications in this document are subject to change without notice.
Microtrac®is a registered trademark of Microtrac Inc.
CE Conformity: This product is in conformance with the protection requirements of the
following European Council Directives: 89/336/EEC, the EMC directive and 73/23/ECC, the Low
Voltage Directive. Conformance of this product with any other “CE Mark” directive shall not be
assumed.
WARNING
This is a class A product. In a domestic environment this product may cause radio interference in
which case the user may be required to take appropriate measures.
CAUTION
This product is intended for use in environments defined by IEC Pollution Degree 2, generally
what would be expected in an office or laboratory. Industrial environments or those that may
result in conductive contamination entering the device, or contamination that may become
conductive when combined with condensation, are not suitable for the equipment.
SYMBOL DEFINITIONS
!
This CAUTION symbol on the equipment refers the user to the Product Manual for
additional information.
WARNING, risk of electric shock. This symbol warns the user of a potential shock hazard
where voltages greater than 30 Vrms, 42.2 Vpeak, or 60 Vdc may be accessible.
Protective earth terminal. Provided for connection of the protective earth (green or
green/yellow) supply system conductor.
Laser Radiation. Refer to Product Manual before removing or opening any covers.
Microtrac Inc.
12501-A 62nd Street North
Largo FL 33773
[phone]

9/03 Microtrac S3500 Particle Size Analyzer Operation and Maintenance iii
About This Document
Abstract
This manual describes the operation and maintenance of the Microtrac S3500 Particle Size Analyzer. The
operating portion of this manual is intended for use with the Microtrac Flex Software Operations Manual.
Revision Notes
The following list provides notes concerning all revisions of this document.
Revision Date ECN Notes
A 1/04 ME0202 Initial release
References
Microtrac Documents
The following list identifies all Microtrac documents that may be sources of reference for the material
discussed in this publication.
Document # Document Title
SW0003 Microtrac Flex Software Operations Manual
SI-RT-01 Fluid Reference Table
SI-RT-02 Particle Refractive Index Table
Contacts
The following list identifies important contacts within Microtrac.
Organization Telephone Address
Microtrac Technical Support 1-727-507-9770 12501-A 62nd Street North
Largo, FL 33773

iv Microtrac S3500 Particle Size Analyzer Operation and Maintenance 9/03
Contents
1. INTRODUCTION ................................................................................................... 1
1.1 Description ..................................................................................................................................... 1
1.2 S3500 Configurations and Ranges .................................................................................................2
1.3 Safety Considerations..................................................................................................................... 3
1.3.1 Electrical.............................................................................................................................. 3
1.3.2 Hazardous Substances ......................................................................................................... 3
1.3.3 Laser Safety ......................................................................................................................... 4
1.4 Specifications ................................................................................................................................. 6
2. INSTALLATION .................................................................................................... 9
2.1 General ........................................................................................................................................... 9
2.2 Selecting a Location ....................................................................................................................... 9
2.3 Unpacking ...................................................................................................................................... 9
2.4 Sample Delivery Connections ...................................................................................................... 10
2.4.1 Fluid Connections for Wet Sample Delivery..................................................................... 11
2.4.2 Dry Sample Delivery Connections .................................................................................... 12
2.5 Electrical Connections.................................................................................................................. 14
2.5.1 Power................................................................................................................................. 14
2.5.2 Communications................................................................................................................ 14
2.5.3 Ultrasonic .......................................................................................................................... 14
2.5.4 Dry System Connections ................................................................................................... 15
2.6 Linear Dry Feeder Setup .............................................................................................................. 15
3. OPERATION ....................................................................................................... 17
3.1 General ......................................................................................................................................... 17
3.2 Sample Delivery ........................................................................................................................... 17
3.3 Dispersion..................................................................................................................................... 19
3.3.1 Wet Sample Dispersion ..................................................................................................... 19
3.3.2 Dry Sample Dispersion...................................................................................................... 20
3.4 Particle Size Measurement ........................................................................................................... 20
3.4.1 Background Offset............................................................................................................. 20
3.4.2 Run Data Parameters ......................................................................................................... 21
3.4.3 Running a Sample.............................................................................................................. 22
3.5 Collector Lens Change ................................................................................................................. 22
4. MAINTENANCE .................................................................................................. 24
4.1 Introduction .................................................................................................................................. 24
4.2 Cleaning Optical Elements ........................................................................................................... 24

9/03 Microtrac S3500 Particle Size Analyzer Operation and Maintenance v
4.3 Cleaning the Sample Path............................................................................................................. 25
5. SERVICE............................................................................................................. 28
5.1 Hardware, Optics, Sample Delivery ............................................................................................. 28
5.2 Electrical....................................................................................................................................... 28
5.3 General Fault Isolation ................................................................................................................. 29
5.4 Accessories and Replacement Parts ............................................................................................. 30
Tables
Table 1-1 S3500 Configurations and Ranges .............................................................................................. 2
Table 5-1 Troubleshooting Chart................................................................................................................ 29
Table 5-2 Accessories and Replacement Parts.......................................................................................... 30
Table 5-3 Diagnostic Sample Test Materials.............................................................................................. 30
Figures
Figure 1-1 Microtrac S3500 Analyzer System ............................................................................................. 1
Figure 1-2 Laser Safety Labels ..................................................................................................................... 5
Figure 2-1 Wet and Dry Sample Cells ........................................................................................................ 10
Figure 2-2 Conversion Sequence from Wet to Dry Sample Cells .............................................................. 11
Figure 2-3 Typical Fluid Connections, SDC Pictured ................................................................................ 12
Figure 2-4 Vacuum Connections ................................................................................................................ 13
Figure 2-5 Air and Electrical Connections ................................................................................................. 13
Figure 2-6 Linear Dry Feeder with S3500 and SDC .................................................................................. 15
Figure 2-7 Sample Delivery Tube Fittings, Installation ............................................................................. 16
Figure 3-1 Microtrac Tri-Laser Laser Diffraction Particle Size Measurement........................................... 17
Figure 3-2 Recirculator Flow Diagram....................................................................................................... 18
Figure 3-3 Eductor Gap and Air Pressure Settings ..................................................................................... 20
Figure 3-4 Collector Lens Change.............................................................................................................. 23
Figure 4-1 Sample Module ......................................................................................................................... 26

Introduction
9/03 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 1
1. Introduction
1.1 Description
The S3500 uses the phenomenon of scattered light from multiple laser beams projected through a
stream of particles. The amount and direction of light scattered by the particles is measured by an
optical detector array and then analyzed by the Microtrac Software.
Particulate samples may be delivered in a wet or dry state, depending on the characteristics of the
sample and the sample delivery equipment configured with the system. The ranges of size
measurements are described in Table 1-1.
Figure 1-1
Microtrac S3500 Analyzer System

Microtrac S3500 Particle Size Analyzer Operation and Maintenance
2 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 9/03
1.2 S3500 Configurations and Ranges
Table 1-1 S3500 Configurations and Ranges
Configuration Wet Range Dry Range
Enhanced 0.02 – 2800 um 0.25 – 2800 um
Extended 0.02 – 1400 um 0.25 – 1400 um
Special 0.09 – 1400 um 0.25 – 1400 um
Standard 0.25 – 1400 um 0.25 – 1400 um
Basic 0.7 – 1000 um 0.7 – 1000 um
Basic System
Has all of the benefits of Microtrac technology with multiple lasers and a full software feature set. The
Basic System is designed to be a cost-effective particle size analyzer while meeting a broad range of
application requirements. As with all S3500 systems, the Basic can be upgraded to keep pace with your
needs.
Standard System
Builds on the Basic System with increased range to measure both larger and smaller samples. The added
range also allows the Standard System to function as an SRA150 to maintain continuity with your legacy
data. This is not a data conversion or emulation. It is a true duplication of SRA150 operation from optics
through data calculation. The Standard System is fully traceable to your current Microtrac SRA150.
Special System
Uses the tri-laser system to provide a wet range down to .09 microns and a dry range down to .25 microns.
The Special System is also fully traceable to your current Microtrac SRA150 as described in the Standard
System.
Extended System
The lower range limit of the Extended System reaches to the practical boundaries of laser diffraction
measurements. The S3500 Extended System includes the same tri-laser and array detection developed for
the Microtrac X100. The S3500 Extended system is fully traceable to several previous Microtrac systems
including the X100.
Enhanced System
Offering the broadest size range available, the Enhanced System provides a comprehensive system capable
of handling any of your particle sizing needs. This unit is best suited for varying R&D requirements and
customers needing a system to test a wide range of different sized samples. The Enhanced System is fully
traceable to legacy X100, SRA150, SRA200 and FRA operation. As with legacy mode operation in all
S3500 configurations, traceable results are achieved with a true duplication of the legacy instrument
selected.

Introduction
9/03 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 3
1.3 Safety Considerations
This manual is intended to cover only the information needed to correctly and safely operate the S3500
analyzer. For a complete understanding of all safety requirements applicable to your Microtrac particle
size analysis system, please refer to the appropriate manuals for all other devices included.
1.3.1 Electrical
The S3500 is normally powered from a 115 VAC source and optionally powered from a 230 VAC source.
The hot and neutral leads (or both hot leads when using 230 VAC) of the AC power input are individually
fused. See Section 1.4 for fusing requirements.
WARNING
Always turn electrical power off when performing maintenance or service on the S3500.
Always use approved cords. Never operate the unit from a power source that does not have a safety-ground
connection.
1.3.2 Hazardous Substances
Some solvents and sample materials pose health and/or environmental hazards. Follow all applicable
regulations for managing personnel protection, toxic fume control and waste disposal.
Personnel Safety
The nature of the user’s particle size application and any inherent hazards it may impose are beyond the
control of Microtrac Inc. It is the user’s responsibility to identify any hazards caused by solvents and
sample materials, and to take appropriate measures where necessary to prevent physical contact with these
substances or their vapors, ignition, or other dangerous conditions.
CAUTION
The user of this equipment is responsible for the proper handling of all solvents and sample materials. Always
consult Material Safety Data Sheets and other pertinent documentation for proper methods of use to protect
personnel and property.
CAUTION
The vacuum system provided by Microtrac for delivery of dry samples is capable of filtering 99.97% of particles
down to 0.3 µm in size. The remaining particles will pass through the filters to the surrounding area. It is the
user’s responsibility to evaluate any risk that might be presented by such release and take appropriate
precautions. Refer to the vacuum manual for guidance on handling hazardous materials, maintenance and
disposal of filters, and accessories to aid in handling hazardous materials.
CAUTION
The Microtrac Particle Size Analyzer is not designed to handle explosive or highly flammable dry particulate
samples. Microtrac, Inc. recommends that such substances be suspended in a fluid. Consult with a chemist or
other experts before undertaking such analyses.

Microtrac S3500 Particle Size Analyzer Operation and Maintenance
4 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 9/03
WARNING
Fluids which may exhibit high instability when agitated, such as concentrated peroxides or nitroglycerin, must
not be used. When using any volatile or flammable material, always use proper and adequate ventilation and
follow all other safe handling laboratory procedures.
WARNING
Read and understand the manual included with the vacuum system before analyzing dry samples. The vacuum
is a potential source of ignition and must not be used with or near explosive or flammable dry particulate matter,
or in areas where flammable gases may be present. Microtrac recommends that hazardous samples be
suspended in a liquid and analyzed through the use of the wet sample recirculator. Consult with a chemist or
other experts before undertaking such analyses. When using any volatile or flammable material, always use
proper and adequate ventilation and follow all other safe handling laboratory procedures.
Disposal and Venting of Hazardous Materials
Before the S3500 particle size analysis system is put into operation, check local sewage disposal
ordinances to determine whether external filters or traps are required for the sample effluent before it can
be discharged into the drain. Depending upon the materials and solvents, the sample effluent may also
require a settling tank or purging procedure prior to being drained into the municipal waste treatment
system or disposed of according to local safety standards.
Local sewage disposal ordinances also dictate what fluids can be discharged into public systems. Fluids
not approved for discharge must be collected and disposed of properly.
Specialized ventilation equipment may be required to control or contain any hazardous or toxic fumes.
Follow all applicable regulations to prevent dangerous conditions or prohibited environmental release.
Chemical Compatibility
S3500 particle size analysis systems comprise various combinations of different devices, each with its own
compatibility with different chemicals. Please refer to the manual for the appropriate Microtrac sample
delivery device for information on compatibility with various solvents and sample materials.
Please refer to section 1.4 for a list of materials in the S3500 that come in contact with samples and
solvents.
1.3.3 Laser Safety
Laser safety labels are affixed inside the bench, see Figure 1-2. The S3500 employs up to three diode
lasers. See section 1.4 for laser specifications. The S3500 operates in a mode where the lasers are
normally OFF and are turned ON only for data acquisition.

Introduction
9/03 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 5
Figure 1-2
Laser Safety Labels
WARNING
Laser radiation may be exposed when the top case cover or sample module door is open. Avoid direct
exposure to the beam. Do not view the beam directly or with any optical instruments.
Do not tamper with or attempt to defeat any safety interlocks. Use of controls and adjustments, or performance
of procedures other than specified by the manufacturer may result in hazardous radiation exposure.
Laser Interlock
The interlock safety feature consists of three microswitches in series which must be closed to allow the
lasers to operate. One safety interlock microswitch is closed when the access cover of the S3500 is closed.
Two additional microswitches close when the sample cell chamber access cover is closed. With both
access covers closed, the lasers can be activated under computer control.
Laser Alignment
Laser light source alignment is accomplished automatically by means of two adjusting stepping motors
under computer control. During alignment and normal operation, the laser light source is contained within
a protected compartment and not visible to the operator.

Microtrac S3500 Particle Size Analyzer Operation and Maintenance
6 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 9/03
1.4 Specifications
Electrical
AC Input: 90-132 VAC, 47-63 Hz, single phase
200-265 VAC, 47-63 Hz, single phase
Line Cord: IEC320/UL498 input connector. Replacement cord must have safety-ground wire, and must
have a current rating greater than the fuse ratings listed below.
Power Consumption: 25 VA maximum
Fuse Ratings: 115 VAC 2 @ 1.0 A
230 VAC 2 @ 0.5 A
Fuse: Installed in AC input module fuse tray in rear panel
5 x 20mm type T cartridge fuses, 250V
Computer Interface: RS232 using proprietary communication cable, (see section 5.4)
Recirculator Interface (optional): Standard, molded, 25 pin, male-female, straight through interface cable
Ultrasonic Power Output (optional): Coaxial cable, BNC connectors
Lasers
Wavelength: 780 nm
Power: 3 mW nominal
Environmental
Temperature: 10 to 35ºC
Humidity: 90% RH, non-condensing maximum
Storage Temperature: –10 to 50ºC (dry only)
Pollution: Degree 2
Connection Ports, Wet Operation
Fittings: 3/8" 316 stainless steel
Connection Ports, Dry Operation
Vibratory Inlet: Open funnel
Aspiration Inlet: ¼” opening (base of funnel), friction-fit tube fitting
Vacuum Connection: Proprietary quick-disconnect fitting, 1¼” tube (standard vacuum hose)
If supplied by user, vacuum source must exceed 50 CFM, 50 “H2O
Eductor Air Connections: 4mm push-to-connect fittings
Eductor Air Supply: 100 psi (689 kPa) maximum pressure
5 CFM at 50 psi (345 kPa) minimum flow rate
Free of dry contaminants, moisture and oil
Particle Size
Particle Size: 3000µm maximum dimension of spherical or non-spherical particles

Introduction
9/03 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 7
Materials in Contact with Samples and Solvents
Wet Operation: 316 stainless steel, perfluoroelastomer, Teflon, glass
Refer to recirculator manual for remaining materials in fluid path
Dry Operation: 303 stainless steel, anodized aluminum (black chrome plated 303 stainless steel optional),
302 stainless steel, PVC, HDPE
Vacuum (subject to change by manufacturer): paper, cotton, glass fiber, aluminum, EVA
Physical Specifications
Case Material: Steel and impact-resistant plastic
Finishes: Exterior surfaces finished with corrosion resistant paint or plating
Dimensions: 14H x 22W x 18D in. (360H x 560W x 460D mm)
Weight: 60 lbs. (27 kg)

Installation
9/03 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 9
2. Installation
2.1 General
Installation of the S3500 analyzer requires connecting the unit to the personal computer and sample
delivery system. These instructions cover the analyzer and an overview of the entire system. Please refer
to the manual associated with your sample delivery device to ensure a proper installation. This section
covers installation of both wet and dry systems. All headings that refer to a delivery method not being
used in your installation may be disregarded.
2.2 Selecting a Location
The working surface on which the system is placed must be level for proper operation. Select a location
with a convenient source of electrical power.
For a system using wet sample delivery, the location requires access to a carrier fluid. This might be a
remote reservoir of organic solvent, a deionized (DI) water system, or a domestic water supply (tap water).
A means for removing the solvent is also needed. This could be a catch tank, a reclamation system or a
drain line leading to a municipal sewer.
CAUTION
An emergency cutoff valve is an essential part of any installation using wet sample delivery. Microtrac
recirculators do not incorporate integral manual cutoff valves due to the wide variety of installation conditions. It
is strongly recommended for installations using a pressurized or gravity-fed fill line that the user provides an
emergency cutoff valve within easy access of the equipment operator.
Systems using dry sample delivery require a source of vacuum. This is typically provided with the system,
but an in-house vacuum source can be used as well. See section 1.4 for minimum performance
requirements of a user-supplied vacuum source.
CAUTION
Any user-provided vacuum system must use static suppression on the motor and hoses.
A source of compressed air is required to operate the eductor. Maximum allowable pressure and minimum
flow rate are listed in section 1.4. It is highly recommended that a moisture/oil trap and filter be used to
provide the highest measurement accuracy and to maintain system reliability.
CAUTION
Do not exceed the maximum eductor air pressure listed in section 1.4.
2.3 Unpacking
Examine and compare the contents with the packing list. Notify the carrier and Microtrac Inc. immediately
if any of the items listed are either missing or damaged.

10 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 9/03
2.4 Sample Delivery Connections
These instructions cover only the connections to the S3500 analyzer. Please refer to the delivery system
manual(s) for complete details on system connections.
Installing and Changing Between Wet and Dry Sample Cells
Different sample cells are used for wet and dry operation. See Figure 2-1. Verify that the correct sample
cell is installed for the type of delivery desired.
Wet Sample Cell and Holder Dry Sample Cell
Figure 2-1
Wet and Dry Sample Cells
The S3500 was designed for quick and easy conversion from wet operation to dry and vice versa. The
following instructions describe changing the S3500 sample cell from wet to dry. To change from dry to
wet, simply reverse the procedure.

Installation
9/03 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 11
Step 2 Step 3 Step 4
Step 5 Step 6 Step 7
Figure 2-2
Conversion Sequence from Wet to Dry Sample Cells
1. Drain the recirculator before removing any fluid connections.
2. Remove the tubing connections from the Sample Cell. (When reconnecting these fittings, note
that they should be tightened hand-tight.)
3. Loosen the large knurled Sample Cell Clamp knob.
4. Open the Sample Module door and remove the Sample Cell, grasping the black handle. Remove
any moisture from inside the sample cell windows before it is allowed to dry.
5. Loosen the two Sample Cell Retainer knobs. The Retainers will rotate away from the Sample Cell
Holder. Remove the Sample Cell Holder.
6. Insert the Dry Delivery Cell and tighten the Sample Cell Retainer knobs. The retainers will swing
into position as you begin to tighten them.
7. Snap the Vacuum Tube Elbow into place on the bottom of the Dry Delivery Cell.
2.4.1 Fluid Connections for Wet Sample Delivery
CAUTION
•If solvents are being used as the recirculating fluid medium, any leak can present a hazard to operating
personnel. Check all parts of the liquid handling system for leaks at installation and periodically thereafter.
This includes all tubing fittings and also the fluid paths inside the SDC and the Analyzer.
•Manual shutoff valves should be installed wherever appropriate in the liquid supply lines within easy reach
of the operator in case of emergency.

12 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 9/03
Refer to the appropriate recirculator manual for tubing connection details. The fluid path through the
S3500 sample cell is from bottom to top. The inlet fitting is on the bottom, the exit fitting on top. Large-
radius tubing elbows are provided to simplify the connections and ensure a smooth fluid path. Note that
the knurled nuts attaching the tubing elbows to the wet sample cell holder should be tightened hand-tight
only. See Figure 2-3 as an example of a typical installation.
Figure 2-3
Typical Fluid Connections,
SDC Pictured
Most installations use Teflon tubing. It is frequently helpful to bend the tubing to shape to fit in confined
areas. This can be achieved by simply heating the Teflon tubing with a heat gun while holding the tubing
in its desired shape until it cools sufficiently. Make sure the connecting tubes are long enough to prevent
kinking at the fittings. Always ensure that tube ends are cut straight and perpendicular to the tube, and that
they are fully inserted into their fittings. Improper connections at the fittings can cause crevices where
sample can accumulate. Refer to the recirculator manual for details.
2.4.2 Dry Sample Delivery Connections
Vacuum
All dry sample delivery systems use vacuum to remove sample. With the dry sample cell installed in the
analyzer, connect the vacuum tube elbow to the sample cell using the push-on fitting. The fitting swivels
full circle to allow the vacuum hose to approach from different directions as needed. Install the vacuum
hose from the Microtrac-supplied vacuum system or a user-provided system by pushing it onto the vacuum
tube elbow. See Figure 2-4.
The vacuum hose typically attaches to a canister-type industrial vacuum. Control of the vacuum is
achieved by inserting the plug into the dry sample delivery controller included with your system.
Alternatively, a centralized vacuum source may be used if it meets the requirements listed in section 1.4.
Control of the vacuum would then be through an electric valve plugged into the controller in place of the
canister vacuum.

Installation
9/03 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 13
Clean-up Wand
Maintaining a clean work area can be difficult with a dry system. Microtrac provides a clean-up wand to
assist. Remove the plastic plug in the vacuum tube elbow and replace it with the plastic 90° hose barb.
Leave the hose barb slightly loose so it can swivel. Push the tubing over the barb and attach the tapered
fitting on the other end to the push-button valve. A variety of wands can be installed in the push-button
valve. (The large-diameter attachments in the wand kit are not needed and may be discarded.) When the
vacuum is on, pushing the push-button valve allows local clean up of the area. Do not use the clean-up
wand during a measurement, since airflow has an effect on measurement results. See Figure 2-4.
Figure 2-4
Vacuum Connections
Eductor Air
Eductor air is controlled by a valve and regulator mounted inside the S3500 analyzer. Connect an air
supply to the Air In port using the 4mm flexible tubing supplied. Simply push the tubing into the fitting
until it stops. To remove the tubing, press the release ring in while pulling the tubing out. See section 1.4
for air supply requirements. It is highly recommended that a moisture/oil trap and filter be used in the
supply line to ensure maximum measurement accuracy and system reliability.
Connect another length of 4mm tubing from the Air Out port to the 90° fitting on the dry sample cell. See
Figure 2-5.
Figure 2-5
Air and Electrical Connections

14 Microtrac S3500 Particle Size Analyzer Operation and Maintenance 9/03
2.5 Electrical Connections
2.5.1 Power
CAUTION
AC power to all system components must be turned off when attaching or disconnecting electrical cables to
prevent the possibility of damage to the computer and/or the S3500.
120 VAC Operation
All the electrical connections for the S3500 can be found at the rear of the unit. See Figure 2-5.
The power connection is a line cord with a 3-prong plug. After turning the power switch on the front of
the unit to OFF, connect the line cord to the rear of the unit and the other end to a grounded 3-conductor
receptacle.
230 VAC Operation
All the electrical connections for the S3500 can be found at the rear of the unit. See Figure 2-5.
Discard the power cord provided. After turning the power switch on the front of the unit to OFF, connect a
power cord with the appropriate plug to the rear of the unit and the other end to a grounded 3-conductor
receptacle.
2.5.2 Communications
The connectors for communications with the personal computer and some types of sample delivery devices
are located at the rear of the S3500. The personal computer cable is proprietary, see section 1.4 for details.
Its connectors are marked “PC” and “Analyzer”. Insert the end marked “PC” into the serial port of the
personal computer and the end marked “Analyzer” into J1 on the S3500. Tighten the screws on both
connectors hand-tight. Note that the Microtrac application software must be configured to associate the
S3500 with the correct serial port. See the appropriate software manual for details.
Some sample delivery devices require a communication connection to the S3500. Consult the appropriate
manual for details. The S3500 connector for such devices is J2. Insert the end of the cable into the S3500
J2 connector and tighten the screws hand-tight.
2.5.3 Ultrasonic
This section applies only when the system includes a Microtrac recirculator equipped with an ultrasonic
option. The ultrasonic driver board is located in the S3500 analyzer. A coaxial cable carries power from
the analyzer to the ultrasonic probe in the SDC. Connect the coaxial cable to the BNC connectors marked
J3 on the SDC and analyzer.
CAUTION
Do not attempt to operate an ultrasonic-equipped recirculator with the ultrasonic cable to the analyzer
disconnected. Damage to the ultrasonic driver board will result. The coaxial Ultrasonic cable must be
connected to both the analyzer and the reciculator prior to powering up either unit.