Hach-Lange ORBISPHERE 3650 - Manual (Page 27)

25
Section 4 Operating Information
4.1 Operating controls
The front panel of the instrument has a three-digit liquid crystal display (LCD). The LCD includes
a right-side marker to distinguish between gas concentration and temperature display. This
marker also indicates the measurement display units (ppm, ppb, %, etc.) depending on the
instrument model. To the LCD's right is a label showing the measurement units configured at the
factory for your application.
In addition to the controls indicated on the front panel, there is also a pressure relief valve
switch on top of the instrument (as indicated in
Figure 1 on page 19 ) to enable atmospheric
pressure equilibrium for sensor calibration, or for measurements in gaseous samples in % units.
The panel keyboard has the following push-button controls:
Power switch. This turns instrument power on or off. The instrument starts in measurement
mode
Places the instrument in measurement mode
Calibrates the analyzer against a reference sample. This button can be locked out from
the WinLog97 PC program
Stores a measurement value into memory
Backlights the LCD for approximately three minutes
Toggles between gas concentration and temperature measurement displays in
measurement mode, increases or decreases the storage number during storage or
memory view, or sets a calibration value during calibration