Connecting the Data Acquisition Unit, DAU

Installation Manual

308014EN, Edition 4	Rosemount Tank Radar REX
May 2013	Chapter 4 The Data Acquisition Unit

4.3Connecting the Data Acquisition Unit, DAU 2100

Instructions for connection of the Data Acquisition Unit is given on the inside of its cover.

4.3.1Power Supply

The Data Acquisition Unit receives its power via the local line from the associated Radar Tank Gauge. If the distance between the Transmitter Head and the Data Acquisition Unit is longer than 2.0 m, a junction box must be used to connect an extension cable. This extension cable must not be longer than 50 m. For safety reasons the ends of the unused wires must be properly insulated and terminated. The junction box can either be customer supplied or supplied by Rosemount Tank Gauging as an option, see chapter 8.

4.3.2Temperature Sensors

Under the lid of the Data Acquisition Unit there are instructions printed as to how to connect the sensors and transducers.

DAU_Tempsens_Connect.eps

Connect temperature sensors.

Connect Reference Resistor to terminals 43, 44 and 45.

Figure 4-3. The X21 terminal for temperature sensor connec- tions.

Either Pt 100 (spot element) or Cu 100 (averaging sensor) temperature sensors can be used. If the sensors are connected with common return wires then jumpers must be connected in the Data Acquisition Unit terminals.

Intrinsically safe connection of the temperature sensors, the RTDs, is made with n + 2 wires for an n-element spot or averaging sensor. There are spot elements with three wires for each element. The DAUs can connect up to 14 RTDs (Resistance Temperature Detectors) on the X21 terminal on the motherboard.

4-3

308014EN, Edition 4 specifications

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Emerson Edition 4 Connecting the Data Acquisition Unit, DAU, Power Supply, Temperature Sensors

Models: 308014EN Edition 4