HACH LANGE ORBISPHERE 3654, User Manual, Page: 21 / 58

19
Operating Instructions
Minimum sample flow rates, measurement ranges and response times for the various
membranes are given in the tables in
Sensor specifications on page 10 .
The LCD includes a right-side marker to distinguish between gas concentration measurements
and temperature. This marker also indicates the measurement display units (k/kg, V/V, etc.
depending on the instrument configuration).
To switch between gas measurement and temperature measurement, press the
Up/Down
Arrow
buttons. To illuminate the LCD for approximately three minutes, press the
Backlight
button.
4.2.1 Select gas measurement phase
Ensure the gas measurement phase is correct for this measurement. For details on viewing the
current setting, refer to
Reviewing instrument configuration on page 29 . For details on changing
this setting, refer to Configuring the instrument on page 29 .
4.2.2 Measurement mode
You can set the measurement mode to normal or maximum. For details on how to do this refer
to
Measurement mode on page 32 .
Maximum mode facilitates making measurements in bottles and cans. To search for a maximum
measurement value, press the
MEAS
button.
•
The LCD first shows the message
[run]
for a few seconds, before displaying measurement
values.
•
After a 60 second measurement cycle, the instrument searches for two consecutive gas
measurements with less than 2% difference. When this condition occurs, the displayed value
freezes on the LCD (indicated by a blinking display), allowing you to note down or store the
data.
The display remains frozen until you press the
MEAS
button to make a new measurement, or
you select normal measurement mode (as described in Measurement mode on page 32 ).
4.3 Storing measurements in the instrument
The analyzer will store up to 500 gas concentration and temperature measurement values,
labeled by numbers 0 through 499, along with the current date and time of each measurement.
You have the choice of acquiring this information manually or automatically, as described below.
Note:
Do not put the instrument into standby while it is in the process of storing data, otherwise the data
values will be lost.
Before storing measurements, you should verify the date and time settings of the instrument's
internal clock, as described in
Clock settings on page 48 .