Installation Manual

Rosemount Tank Radar REX

308014EN, Edition 4

Chapter 4 The Data Acquisition Unit

May 2013

 

 

4.3.3Selecting 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.

X1 - OPEN

X2 - OPEN

X3 - CLOSED

DAU_TempRange.eps

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.

Temperature Range

X1

X2

X3

 

Pt 100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-50

to +125

°C

OPEN

OPEN

CLOSED

 

 

 

 

 

 

-50

to +300

°C

CLOSED

CLOSED

CLOSED

 

 

 

 

 

-200 to +150

°C

CLOSED

CLOSED

OPEN

 

 

 

 

 

 

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 4-3and the spare parts list in Rosemount TankRadar REX Service Manual.

4-4

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Emerson 308014EN, Edition 4 installation manual Selecting the temperature range, Temperature Range
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