Connections; External Power Supply (Optional); Instrument - Pc Connection - Hach ORBISPHERE 3654 User Manual

To check the purge gas flow rate, immerse the end of this tubing in water and switch on the
instrument. Gas should flow intermittently out of the tube.
Note: During normal operation, and especially when the instrument is in standby mode, ensure that the exit
of the purge gas tube is exposed to the atmosphere and not in contact with any liquid or hard surface.

3.6 Connections

3.6.1 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. Refer to
external power supply on page
Connect the male LEMO-6 plug on the 32939, to the RS-232 connector on the right side of the
instrument. The female LEMO-6 plug can then be used to connect to your PC (if required) using
the standard RS-232 cable supplied with the instrument.
Plug the transformer into your mains power supply using the cable supplied.
Note: If the external power supply is not clean, this may result in unstable measurements.

3.6.2 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.
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. Refer to
Troubleshooting - instrument on page 45
Connection
37.
for detailed information.
Table 3 Interface box connections
LEMO-6/9 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
Installation
Model 32939
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
11