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.
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