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traditional total pressure/temperature methods. The liquid sample flow rate is adjustable using the
flow rate adjustment valve (No. 2 in
Both the membrane-covered TC sensor (No. 10 in
are shipped pre-installed on the instrument. It will, however, be necessary to remove the flow
chamber when servicing the sensor.
3.2 3658 PC software installation
Install the Hach 3658 software by inserting the accompanying CD into your PC and running the
SetUp program. Simply follow the on-screen instructions.
When finished, a new directory HU\HU3658 is created on your hard disk containing the software and
help files.
3.3 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 pressure relief valve located on the top of the
instrument (No. 5 in
Figure 1
3.4 Connections
3.4.1 Flow chamber
The flow chamber's sample inlet (N° 1 in
use ¼-inch diameter transparent plastic tubing. Connect by compression fittings to the sample
source and to the drain, respectively.
Control the sample flow using the adjustment valve (No. 2 in
of the flow chamber.
If ordered, you will also have received a model 32051 sample tube adapter to attach the flow
chamber inlet tubing to the sampling point.
3.4.2 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.
Connection
Figure
1) integrated into the flow chamber.
Figure
on page 6) for about 5 seconds before releasing.
Figure 1
on page 6) and outlet (N° 4 in
LEMO-6 Pin
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
1) and the flow chamber (No. 3 in
Figure 1
on page 6) located on the front
Description
Transmitted data (TXD)
Received data (RXD)
CTS
RTS
Not used
Ground
Figure
1)
Figure 1
on page 6)
English 7
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