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Saab TankRadar L/2
55
US Version. Seventh edition, June 1995
Installation Manual
netic interference and compatibility it is very important that a
continuous metal shield is covering the wires between the Trans-
mitter Head and the Slave Data Acquisition Unit. If an extension
cable is used, both the cable and the junction box must provide
good shielding.
12.5 Electrical Installation of the Data Acquisition Unit, DAU
Instructions for the connection of the Data Acquisition Unit is
given on the inside of its cover.
12.5.1 Electrical Installation of the Slave DAU, DAU 2100
The connection to the Radar Tank Gauge is done according to the
instructions in chapter 12.4.2 above.
Either Pt 100 (spot element) or Cu 100 (averaging sensor) tempera-
ture sensors can be used. If the sensors are connected with com-
mon 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 sen-
sor. There are spot elements with three wires for each element.
12.5.2 Electrical Installation of the Independent DAU, 2130
The connection of the power supply and the TRL/2 Field Bus is
made through the lead seal W21.
A Junction Box is required for the non-intrinsically safe connection
of the power supply, the TRL/2 Field Bus and the relay outputs.
The junction box can either be customer supplied or supplied by
Saab Tank Control as an option, see chapter 7.
Temperature sensors are connected in the same way as for the
Slave Data Acquisition Unit which is described above in chapter
12.5.1.
Intrinsically safe 4-20 mA transducers can be connected to the
current inputs with two wires for each sensor. Up to four trans-
ducers can be connected to each Data Acquisition Unit but the
input multiplexer can only bias one at a time. These connections
are normally used for pressure sensors or interface probes.
Eight intrinsically safe digital or frequency inputs are provided.
Each input requires two wires.
Four non-intrinsically safe relay outputs are available with two
wires per relay. This option has to be specified in the Required
System Information Form. The relays are connected through the
lead seal W22.