Hach ORBISPHERE 3654 Basic User Manual page 19

6.2 Analyzer - PC connection
The Configuration, Serial port menu lets you choose one of four serial communication ports.
Click on OK to activate the selected port. If the port you have selected here is available, the Hach
3654 program will return to the main menu. Otherwise, you will see an RS232 ERRORS message
advising you to select another port.
6.3 Reviewing instrument configuration
To review if the analyzer is set up as expected, choose the Configuration, Configuration view
command.
Some of the parameters listed, can be changed by using the Hach 3654 program. However, should
you see any unexpected items listed on your screen which you cannot correct, please contact your
Hach Lange representative.
6.4 Configuring the instrument
The ORBISPHERE 3654 analyzer can be readily configured for your application using the following
commands in the Configuration menu. The instrument must be connected to your PC and powered
on, in order to change any configuration parameters.
6.4.1 Gas measurement phase
The instrument can measure N
which gas phase to use. Choosing the Hach 3654 program's Configuration, Gas Phase menu lets
you select the gas measurement phase.
The gas measurement phase can also be selected from the instrument keyboard as follows:
1. Switch the instrument power OFF.
2. Switch the instrument on by holding down the CAL button and then pressing the POWER button
while still pressing the CAL button.
3. The instrument display will first show PHA before switching to either dIS for dissolved or gAS for
gaseous measurements.
4. Use the Up/Down Arrow buttons to change the gas phase to your choice.
5. Press the MEAS button to save the selected gas measurement phase. The instrument then goes
to measurement mode.
6.4.2 Measurement units
Choose the Configuration, Units menu to select gas measurement units, temperature
measurement units, and the liquid medium in which you are measuring.
Using this dialog box, you can select:
• The Gas units in which gas concentrations are to be displayed
• For dissolved measurements: g/kg, % (by weight), V/V, cc/kg, mL/L, ppm/ppb, ppm or
mg/100mL
• For gaseous measurements: %/ppm (by volume), % (by volume), kPa/Pa, kPa, bar/mbar, bar,
bar20/mbar20 or bar20
• The Liquid medium for dissolved gas concentration measurements: Water, Beer, Cola
• The Temperature units for display: °C or °F
6.4.3 Membrane selection
You may find it necessary to use a different type of membrane for different applications. Naturally,
with any membrane change, you will need to re-calibrate. You should also consider the changes in
required flow rates and response times, which are listed in sensor specifications. Refer to
calibration on page 21.
To re-configure the analyzer, choose Configuration, Membrane to bring up the box which reveals the
membrane models available.
or H in either a liquid or a gaseous sample, but you must select
2 2
Sensor
English 19