Hach ORBISPHERE 3658 Basic User Manual page 7

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
Connections
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.
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
Note: 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.
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.
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 illustrated in
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
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
Pin 9
Figure 1 on page 6) located on the front
Description
Transmitted data (TXD)
Received data (RXD)
CTS
RTS
Not used
Ground
Not used
RS-232 Transmitted Data (TXD)
RS-232 Received Data (RXD)
Not used
Ground
Not used
Request to send RTS
Clear to send RTS
Not used
Figure 1 on page 6)
Figure 2.
English 7