Kongsberg DZ-110/U Transmitter Barrier Unit

The KONGSBERG DZ-110/U Transmitter Barrier Unit is designed to

safely provide signal interface and pow er supply to Kongsberg

instrumentation located in hazardous area. The unit connects

intrinsically safe 4-20 mA transmitters.

Principle of operation

The Transmitter Barrier is installed in safe area, designed to

limit the amount of energy that could appear in an electric circuit

that connects to instrumentation located in hazardous area.

The DZ-110/U is a single channel shunt diode safety barrier,

intended for energising a 2-wire, 4-20 mA signal transmitter

installed in hazardous area. A “current mirror” amplifier re

peats the transmitter current into an equal magnitude safe

side current. To prevent leakage through the zener diodes, the

voltage applied to the barrier section is regulated and limited

to a suitable level. Active current limiting is also incorporated to

prevent fuse blow-out during accidental shorting of the transmit

ter circuit.

Installation

The Transmitter Barrier is typically installed in the processing

cabinet in control room. The DZ-110/U is equipped with blue

coloured terminals 4 and 5/6 for connection of the intrinsically

safe circuit in hazardous area. Terminals 2 and 3 connects the

Transmitter Barrier to an analogue input channel in the moni

toring system. The Transmitter Barrier shall be grounded to the

Intrinsically Safe busbar in the system (6), by minimum a 1.5

mm2 cable.

The DZ-110/U snaps to a TS-32 or a TS-35 mounting rail (ac

cording to DIN46277). End stoppers shall be used to support

the units.

Special conditions for safe use :

1. The separation distance of minimum 50 mm between

intrinsically and non-intrinsically safe circuits has to be

observed for the final installation in a cabinet.

2. The DZ-110/U has to be installed in a cabinet with a degree

of protection depending on installation, but at least IP22.

3. The ambient temperature range for the DZ-110/U is -20 °C ≤

Ta ≤ +70 °C

4. A grounding/earthing bar must be mounted at the

intrinsically safe side of the barrier. Terminal 3 on each

barrier must be connected to this bar by a 1.5 mm2

(minimum) cable.

Safety instruction:

For safety instruction see the document 373874 K-Gauge Ex I

Safety instructions.

FEATURES

• Intrinsically safe connection of 4 - 20 mA transmitters to safe

area

• Snap-on installation to DIN rail (TS-32 or TS-35)

• Small size

• ATEX, IECEx and type approved