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Rosemount Tank Radar REX
Chapter 4 The Data Acquisition Unit
4-4
Installation Manual
308014EN, Edition 4
May 2013
4.3.3 Selecting the temperature range
A DAU can be configured for one of three different temperature ranges
by means of a multiplexer. 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.
Figure 4-4. Selecting the temperature range.
The amplification is selected on the X1 and X2 sockets and the offset is
selected on the X3 according to table 11.3. The standard setting is from -
50°C to +125°C. The database setting of the temperature range in the
TankMaster WinSetup must correspond to the setting of the jumpers.
Table 4-1. Temperature range settings.
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 4-3
and the spare parts list in Rosemount TankRadar REX Service Manual.
Temperature Range
Pt 100
X1 X2 X3
-50 to +125 °C OPEN OPEN CLOSED
-50 to +300 °C CLOSED CLOSED CLOSED
-200 to +150 °C CLOSED CLOSED OPEN
X1 - OPEN
X2 - OPEN
X3 - CLOSED
DAU_TempRange.eps