Commissioning
Remove the cover of housing. Connect electrical power using the connection terminals (see Fig. 2). Thread the
outlets through the cable gland. The sensor is equipped with the polarity reversal protection.
Fig. 3 Electrical schematics (DC supply U = 19-31 V; without display U = 12 - 31 V)
Display
The display shows data in pressure units or according to user's request. The user can adjust the range of the display.
After switching on, the output signal can be measured. When changing the output signal, two circumstances have to
be taken into account.
1) The starting time is 5 minutes. After that time, the output signal has to be stable at the zero differential pressure
and the constant temperature.
2) For measuring ranges below 100 mbar, the shift of zero occurs due to the change of the sensor position. After
passing the starting time, the error can be reset by zero-setting potentiometers RP2 or RP101.
Settings
In general
When designing the display, a simple operation and a customer control were primarily emphasized. Particular
functions are set by two buttons on the front side via the system of menus.
The settings are permanently saved in the Flash-EPROM memory and can be password-protected against an
unauthorized manipulation.
The indicator of measured values (or individual menus) comprises a four-digit seven-segment display with the
height of digits being 7.62 mm.
Location of control elements and the display
Unit
The unit of the displayed measured value is determined at the time of ordering. By default, bar, mbar and m v.s.
are considered (to be specified when ordering). Nevertheless, the unit can be selected later by attaching one of
the enclosed stickers.
Display of measured values and settings menu
In the center, there is the four-digit display showing the measured value and supporting the configuration. The
measured value is displayed in units defined by the user and depends on the scale and adjusted settings.
Control elements for setting the functions
For the control, two buttons located under a foil can be used. The user moves forward in the menu system or
increases the values on the display by the "
▲
" button . The "
▼
" button is used to decrease the values and to
move backward in the menu system.
The menu system is closed. By scrolling the particular menu settings forward and backward, the desired set-
point can be achieved.
By pressing the buttons for a longer time (> 5 seconds), the pulse rate is increased.
By simultaneous pressing of both the buttons,
-
the display mode is changed to the configuration mode,
-
the adjusted value is saved
or
-
the display mode is restored.
ATTENTION: Adjusted parameters are changed just after changing the display mode.
Erasing the display at a different offset of the pressure sensor
(regardless of the measuring range of the pressure sensor, the pressure reference is necessary)
During the lifetime of the pressure sensor, the offset (nominally set at 4,000 mA) may shift. This phenomenon
can cause that the display shows a signal value which differs from the adjusted beginning of the measuring
range. The control software of the display considers this phenomenon and offers a function to eliminate this
phenomenon.
•
The PAof menu should be selected. Both the buttons should simultaneously be pressed.
•
The number 0247 should be entered to select the special function.
•
Both the buttons should be pressed simultaneously again. The following sample value appears on the
display.
•
Now, the pressure sensor has to be pressurized via the pressure reference. The pressure has to
correspond to the beginning value of the measuring range.
•
When pressing both the buttons simultaneously afterwards, the current output signal of the sensor is
saved as an offset. From this moment, the adjusted beginning of the measuring range (zero-point)
appears on the display, although the sensor signal is shifted in the offset.
ATTENTION: Please note that the output signal remains unaffected by this change. Furthermore, the shift of the
range value ("Full Scale") is performed simultaneously with the shift of the offset.
