Saab TankRadar L/2
21
US Version. Seventh edition, June 1995
Installation Manual
4.2
Selecting the Temperature Range
The multiplexer for the RTDs has two different amplification
factors which are jumper selected. It is also possible to provide an
offset to the measured signal by adding a current to it. The ampli-
fication is selected on the X1 and X2 and the offset is selected on
the X3 according to the table in figure 4.3. The standard setting is
from -50
°
C to +125
°
C. The database setting of the temperature
range in the Operator’s Interface (OPI) or the Configuration Soft-
ware (COS) must correspond to the setting of the jumpers.
A high precision reference resistor must be connected to the X21
terminal to positions 43, 44 and 45. Depending on the temperature
range stated in the Required System Information form, one out of
three different reference resistors is chosen and connected. See
figure 4.2 and spare parts list in the Service Manual.
X1 - OPEN
X2 - OPEN
X3 - CLOSED
Temperature Range
Pt 100
X1
X2
X3
-50
-
+125
°
C
OPEN
OPEN
CLOSED
-50
-
+300
°
C
CLOSED
CLOSED
CLOSED
-200
-
+150
°
C
CLOSED
CLOSED
OPEN
Figure 4.3 shows the selection of temperature range.
4.3
Local Readout Display
Both versions can, as an option be equipped with a Local Readout
Display showing the product level as well as the parameters mea-
sured by the DAU itself.
Installation data for Local Readout Display
Ambient operating temperature:
-30
°
C (-22
°
F)
4.4
Write Enable/Inhibit Switch
In order to enable programming of the EEPROM, the S1 switch
must be set in the position, towards the block terminals. The
switch can be locked and sealed in the write inhibit position using
a wire through the clevis pins. See figure 6.3.
