Heinrichs Messtechnik GmbH
Ex- Supplement operating manual
UMC4 with TM/TMU/TME/TMR/TM-SH
Page
15 of 31
4.5.3
Connecting cables
The connecting cables for power supply, signal outputs and sensor circuits must adhere to the requirements of
EN 60079-14.
Note
The connecting cables are to be installed in such a way that they are protected
against mechanical damage and unduly high temperatures.
The external diameters of the connecting cables must be compatible with the
thickness range of the cable glands and rubber seals used.
The cables and cable glands used must be compatible with the type of protection
of the junction box being used.
The dummy plugs used for unused cable glands must be compliant with the type
of protection of the housing being used.
It must be ensured that the cable gland gaskets are correctly seated.
4.5.3.1
Sensor circuits
Compact mounted transmitter UMC4
The sensor circuits in compact mounted assemblies are considered as internal connections and are already
wired up and matched by the manufacturer. There is no need to check the intrinsic safety be the operator.
Remote installation of UMC4
The intrinsically safe sensor circuits are brought out from the converter with a cable tail of at least 1 m. The
length of the cable can be specified when ordering.
The transmitter is fixed by a bracket to a wall or a pipe.
The sensor cable is to be installed by the operator so that it is protected from tension.
The assignment of the wire colors and the circuits see section 4.3.3
4.5.3.2
Electrical connection of power and signal circuits
The electrical connection of power and signal circuits are realized in the terminal compartment of the
transmitter. In it are intrinsically safe and non-intrinsically safe circuits, depending on the type of protection of
the signal output circuits. The type of protection of the terminal compartment is Ex d.
The installation of the cable in the terminal compartment Ex d can be done in two ways:
Direct connection of the cable through a certified flameproof cable gland
Direct connection of cable and wires through specially certified conduits. The associated stopping
boxes must be installed close to the housing.
