13Conducell
™
4US Sensors Operating Instructions
The conditions described in the ATEX / IECEx certificate must be respected.
Assembly
1) The operator of equipment in potentially explosive atmospheres is responsible for ensuring
that all components of the system are certified for that area classification and are compatible
with each other.
2) In gas atmospheres, the Ex approval is not dependent on any conditions regarding mount-
ing of the sensor. In dust atmospheres, however, special restrictions may apply when using
armatures made of plastic material.
3) O-rings having a sealing function between Ex-zone 0 and 1 or Ex-zone 20 and 21, respectively,
must be replaced at each dismantling of the sensor.
4) Sensors, transmitter and equipment required are to be set up within one balanced potential
system.
5) When the sensor is assembled, the ATEX / IECEx sticker is to be attached to the cable in an
easily visible place, as near as possible to the sensor itself. This sticker is to indicate that an
ATEX / IECEx approved sensor is in use. The sticker should not be removed at any time.
13 Connection to transmitter
Conducell 4US is suitable for connection to an intrinsically safe electrical circuit with protection
level ia. The operator of the equipment must ensure that the allowable electrical values for the
sensor all exceed those for the transmitter. None of the values cited for electrical power, voltage
and current may be exceeded in sum (measurement and temperature circuit together). Electric
values for Conducell 4US are as follows:
U = 24 V; I = 173 mA; P: Function of process temperature. The maximum allowable electric
power P of the transmitter (measurement and temperature circuit together) depends on the
desired process temperature.
CONNECTION TO TRANSMITTER
ATTENTION! In case a gas atmosphere and a dust atmosphere are or could
be present at the same time, the risk of explosion must be examined carefully
and special precautions may be necessary.