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Product description
Accessories
Heating elements for the compressors to protect against explosion risks are designed in the pro-
tection types increased safety (Ex d) and have to have to be mounted stationary at the designated
areas in the compressor housing. The heating elements can be operated without temperature- and
oil level control since the thermal type testing by the manufacturer verified that the heating elements
prevent the exceeding of the temperature class of the compressor. The control has to be carried
out in a way that the heating element can only be operated during shutdown of the compressor.
The magnetic coil of the capacity regulator is designed in the protection type encapsulation (Ex m) to
protect against explosion risks. In addition, the connecting areas of the coil are placed in a housing
that complies with the requirements of the protection type increased safety (Ex e).
The oil differential pressure sensor INT250 Ex from Kriwan is executed as a simple electrical operating
device without a recognised ignition protection type. To ensure reliable operation, however, it must be
equipped as an intrinsically safe electrical circuit with switching repeater. Please note that the plastic
housing of the INT250 Ex can be electrically charged by means of charge-generating processes (e.g.
cleaning with a dry cloth, direct additional ventilation via fan etc.). Accordingly, the operator is required
to take measures so that ignition hazards can be reliably ruled out.
Equipment
Type of ignition protection
Terminal box
Ex e
Terminal board
Ex d+e
Through terminals in the terminal box
Ex e
Cable / line entrances / plug
Ex d/e
Magnetic coil
Ex e mb
Oil sump heater
Ex d
Oil differential pressure sensor INT250 Ex
Ex i
Hot gas PTC sensor
Ex i
