Measurement Units - Hach ORBISPHERE 3654 Allgemeines Benutzerhandbuch

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.
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.

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
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 20.
To re-configure the analyzer, choose Configuration, Membrane to bring up the box which reveals the
membrane models available.
Membrane 29561A is available for any gas measurement. Membranes 2935A and 2952A are
available for H measurement only. Choose OK when the desired membrane is selected.
2
Note: Only those membranes applicable to your system can be selected. All other membranes are grayed out.
Automatic data acquisition - Setting sampling intervals
The instrument can perform as a standalone data acquisition device, automatically recording gas
measurements with the date and time, and storing up to 500 of these values. Choosing the Hach
3654 program's Configuration, Sampling Rate menu lets you select time intervals (acquisition rate)
for this storage capability.
Use the slide bar to view and select a sampling rate, from 15 seconds to 1 hour. The selected rate is
shown in the Acquisition rate window. Click OK to save this rate. Once your choice is made, the
instrument can be used independently of the Hach 3654 program for data acquisition. Refer to
Automatic data acquisition
or H in either a liquid or a gaseous sample, but you must select
2 2
on page 14.
Sensor
English 19