7
G
PREMASGARD
®
ALD
| Configuration and zero point calibration
Manual offset adjustment
Offset adjustment is done at a potentiometer on the circuit
board within an adjustment range of ± 50 hPa of the device’s
pressure range.
Ex-factory this potentiometer is in center position and is
lacquer sealed.
Offset adjustment is carried out using a tool called
“screwdriver 2.5” (blade with in mm).
Readout in the display
In the 1st line of the display,
the ACTUAL pressure
up to the
measuring range limit is displayed.
hP
= Hektopascal
The following configurations can be preset via DIP switches.
The DIP switch sliding blocks can be moved without using tools.
DIP switch 3
and
4
are not assigned.
Pressure ranges
In each case four different pressure ranges depending on the
type of device can be preset via DIP switches
DIP 1
and
DIP 2
.
Measurement signal filtering
In order to stabilize the pressure measurement signal
and the output voltage, the measurement signal is
filtered. The time interval for such averaging can be
preset via DIP switch
DIP 5
to 1 or 10 seconds. By a
longer filtering interval, the settling time of the sensor is
automatically extended.
U - Output
(MB: xx...+1100 hPa)
Output voltage at central position of the offset controller
10 V at 1100 hPa
Output voltage 0 ...10 V lower value to final value
10 V
0 V
Displacement of characteristic line
by control knob (right stop)
Offset = +50 hPa
Original characteristic line
Offset = 0
Control knob in
central position = default
Displacement of characteristic line
by control knob (left stop)
Offset = –50 hPa
lower value
final value
U-
output in
V
I - Output
(MB: xx...+1100 hPa)
Output voltage at central position of the offset controller
20 mA at 1100 hPa
Output voltage 4...20 mA lower value to final value
20 mA
4 mA
+ Pa
I output in mA
Displacement of characteristic line(+)
by control knob (right stop)
ca. +50 hPa
Original characteristic line
Offset = 0 (potentiometer in
central position = factory setting)
Pressure difference in Pa
Displacement of characteristic line(–)
by control knob (left stop)
ca. –50 hPa
lower value
DIP switches for pressure range setting,
output attenuation and zero compensation :
Pressure range
(adjustable)
DIP
1
DIP
2
600...1100 hPa
OFF
OFF
700...1100 hPa
O N
OFF
800...1100 hPa
OFF
O N
900...1100 hPa (default)
O N
O N
Measurement signal filtering
(selectable time interval)
DIP
5
10 s (default)
OFF
1 s
O N
Output
(selectable)
DIP
6
Voltage 0 -10 V (default)
OFF
Current 4... 20 mA
O N
M12 connector
(optional on request)
