Sri 302 User Manual

Model 302

Six Channel USB PeakSimple Data System

The Model 302 may be used with any brand or model of GC or HPLC offering an analog detector

output signal ranging from -5V to +5V. It includes three independent, programmable controls (0V to +5V
analog output) for temperature & pressure or HPLC gradient formation. The Model 302 has six channels,
which can be randomly assigned to one of four time bases, which allows independent start and stop times for
four separate instruments. Four remote start inputs compatible with 2-wire switch closures (typically output by
GCs and HPLCs as a remote start signal) are also included for your use. T wo pulse stretchers are provided to
accommodate intstruments with remote start signals shorter than one second (such as Hewlett Packard GCs).

The computer to which you connect the Model 302 must support USB (it must have at least one USB

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port—rev 2.0 or higher—and use Windows

With your purchase of the Model 302, you should receive the following items:

1 - Model 302 Data System box (front and rear views shown below)
2 - USB cable for connection to your computer’s USB port
3 - Manual (either the PeakSimple Chromatography Data Systems or
the SRI general product manual)
4 - PeakSimple for Windows

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98, 98SE, ME, 2000, XP or newer).

software (inside the manual cover)

The Model 302 comes in a sturdy
aluminum box consisting of top and bottom
halves, secured together with two brass
thumbscrews for easy interior access.

The brass thumbscrews are on the left- and
right-hand panels of the Model 302 box.

POWER Indicator LED

Opening for analog signal cable(s)
and remote start device connections POWER switch

Front View

Rear View

Breaker

USB connector Power cord

Model 302

Six Channel USB PeakSimple Data System

1. Open the Model 302

V erify that the Model 302 is powered OFF and unplugged. Remove the thumbscrews
on both sides of the Model 302 box and slide the top cover up and off. It is
connected to the bottom of the box by a ground wire, so just set it next to the
bottom half of the box.

High voltage
aluminum

Power Supply board

A/D board

safety cover

The Model 302 box contains two circuit
boards. The board on the right-hand side
is the A/D board. The board on the left­hand side under the removable high voltage
aluminum safety cover is the Power Supply
board. If you need to remove the high

voltage aluminum safety cover,
ALWAYS unplug the Model 302 fr om
the wall power outlet first (you do not

need to remove it for the wiring
connections described here).

2. Connect the Analog Signal Cable(s)

NOTE: The analog output from some GCs and LCs can have a range of up to 10 volts DC. The Model 302
can tolerate this voltage input, but signals above 6 volts will generate unwanted noise and signals above 5 volts
will be “clipped” (the tops of the waveforms will be cut off). Use the 1 volt output typically available on the
back of your instrument.
2-1. Route the analog signal cables from your instrument through the open hole in the back of the Model 302.

2-2. Strip 1/4” of insulation from the
“signal+” and “signal-” wires of your
instrument’ s signal cables.
2-3. Remove any jumpers placed in the
Channels 1-6 screw terminals at the factory .
Insert the “signal+” wire into the A/D board
screw terminal marked “1 +” and secure the
connection with a small flat-blade
screwdriver.
2-4. Insert the “signal-” wire into the A/D
board screw terminal marked “1 -” and
secure the connection.
2-5. Repeat the connection of signal cables
for channels 2, 3, 4, 5, and 6. Any unused
channels MUST have both inputs jumpered

Channels 1-6 and GD (ground) screw terminals

to ground.

The remote start wires for the first two
instruments are inserted into these screw
terminals on the Power Supply board.

Model 302

Six Channel USB PeakSimple Data System

3. Connect the Remote Start Cables (OPTIONAL)

The Model 302 remote start capability allows you to start the
data system by means of a switch closure. Four separate remote
start circuits permit the user to individually start TIMEBASE 1,
2, 3, and 4 of the data system. In some applications, the
chromatograph being used with the Model 302 may offer a
remote start signal output or switch closure output that permits
starting an integrator or other device when the ST AR T button
is pressed on the chromatograph’s on-board control panel.
Typically, this signal can be used to start the Model 302.
TIMBASES 1 and 2 are equipped with pulse stretchers.
3-1. Route the remote start cable from your instrument through
the open hole in the back of the Model 302.
3-2. Strip 1/4” of insulation from the “+” and “-” wires of your
remote start cable(s).
3-3. Insert the “+” wire into the Power Supply board screw
terminal marked “#1 IN” and secure the connection.
3-4. Insert the “-” wire into the Power Supply board screw
terminal marked “#1 G” and secure the connection.
3-5. For a second instrument, insert the “+” wire into the “#2
IN” terminal, and the “-” wire into the “#2 G” terminal.

3-6. The screw terminals for the third and
fourth instruments’ remote starts are on the
A/D board. The bank of screw terminals is
labeled “DIGITAL IN” under “1 2 3 4.”
Connect the “+” wires for the third and fourth
instruments to screw terminals 3 and 4,
respectively . Connect both “-” wires to the
“GD” screw terminal next to the “4” screw
terminal (on the right-hand side).
NOTE: TIMBASES 3 and 4 require a
remote start signal that persists longer for than
one second. Check your instruments’
specifications (for example, Hewlett Packard
GCs produce a very short remote start pulse,
so you should connect one of these to
TIMEBASE 1 or 2, which are equipped with
pulse stretchers).

1234GD

Connect the remote start “+” cables to screw terminals “3” & “4,”
and the “-” cables to “GD”.