Rosemount Tank Radar AB REX 用户手册
Saab TankRadar L/2
15
US Version. Seventh edition, June 1995
Installation Manual
3.1.5
Current Loop Card, CLC (Option)
The optional Current Loop Card provides intrinsically safe 4-20
mA inputs and outputs. The inputs can be used for example for
pressure sensors, while the outputs can be used for pointer instru-
ments or for output of a measured value as an analog signal.
mA inputs and outputs. The inputs can be used for example for
pressure sensors, while the outputs can be used for pointer instru-
ments or for output of a measured value as an analog signal.
If a Slave DAU is also connected, two 4-20 mA inputs and two 4-
20 mA outputs are available. If a Slave DAU is not connected, one
additional 4-20 mA input is available, although this transducer
must have its own intrinsically safe power supply.
20 mA outputs are available. If a Slave DAU is not connected, one
additional 4-20 mA input is available, although this transducer
must have its own intrinsically safe power supply.
When the optional Current Loop Card is used, the JB 12 Junction
Box from Saab Tank Control is recommended since the cables are
separated inside the box according to the requirements for intrin-
sic safety. See chapter 7.2.
Box from Saab Tank Control is recommended since the cables are
separated inside the box according to the requirements for intrin-
sic safety. See chapter 7.2.
W11
W12
FOR
INTRINSICALLY
SAFE CIRCUITS
ONLY
INTRINSICALLY
SAFE CIRCUITS
ONLY
"i"
~2 m cable
with
protective
hose
Transmitter Head with
Current Loop Card
Signal
Power
230/115 V
230/115 V
~2 m cable
with
protective
hose
JB 12
JB 16
Analog
inputs
Analog
outputs
Figure 3.5 shows a Transmitter Head with a Current Loop Card.
3.1.6
Metrological Seal
The Metrological Seal consists of a rod that can activate a write-
enable switch from the outside of the Transmitter Head. This rod
can be sealed in the write-inhibit position to prevent unauthorized
changes in the database.
enable switch from the outside of the Transmitter Head. This rod
can be sealed in the write-inhibit position to prevent unauthorized
changes in the database.
If there is no Metrological Seal mounted, then the Transmitter
Head is always in write-enable mode.
Head is always in write-enable mode.
3.1.7
Installation Data for the Transmitter Head
Ambient operating temperature:
-40
°
C to +65
°
C
(-40
°
F to +149
°
F)
Explosion protection
Class 1, Div I, Groups C and D
(UL1203, UL913 USA) and
EEx d[ia] IIB T4 (EN50014,
EN50018 and EN50020 Europe)
(UL1203, UL913 USA) and
EEx d[ia] IIB T4 (EN50014,
EN50018 and EN50020 Europe)
Power Supply
115 or 230 VAC, +10% to -15%,
50-60 Hz, max. 80 W
50-60 Hz, max. 80 W
Field bus
TRL/2 Bus (FSK, half duplex,
two wires, galvanically iso-
lated, 4800 Baud)
two wires, galvanically iso-
lated, 4800 Baud)