FISCHER Mess- und Regeltechnik GmbH
Installation and assembly | 3
BA_EN_NK10_H_ST4-C
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3.4 Electrical connections
▪ By authorized and qualified specialized personnel only.
▪ When connecting the unit, the national and international electro-technical
regulations must be observed.
▪ Disconnect the system from the mains, before electrically connecting the
device.
▪ Install the consumer-adapted fuses.
▪ Do not connect the connector if strained.
The instrument may only be installed and commissioned by specialized person-
nel familiar with the installation, commissioning and operation of this product.
Specialized personnel are persons who can assess the work they have been
assigned and recognize potential dangers by virtue of their specialized training,
their skills and experience and their knowledge of the pertinent standards.
For explosion-proof models, the specialized personnel must have received spe-
cial training or instruction or be authorized to work with explosion-proof instru-
ments in explosive areas.
The installed cables and wires must be tested with a reduced tensile force
(25%) in compliance with Section A.3.1 of the standard EN 60079-0 and may
only be used for permanent installation of operating equipment of Group II. The
operator must ensure that the cables are connected with clamps accordingly.
When laying the electrical supply lines, ensure that no short circuit between the
electrical conductors and the surroundings can occur.
A locking and unlocking system as per DIN 4754-3 must be incorporated, if the
device is used as a fill level limiter. This safety system must conform to DIN
50156 / VDDE 0116.
3.4.1 Intrinsically safe power circuits
For use in areas at risk of explosion, instruments must be connected to certi-
fied, intrinsically safe electricity circuits. The following are the limit values with
which the operating equipment can be operated. Compare these to the informa-
tion in the attached EC type testing certificate.
Contact power circuit
In ignition protection type intrinsic safety EEx ib
IIC
Max. voltage
U
i
= 30V
Max. current
I
i
= 160 mA
Max. output
P
i
= 800 mW
The effective inner inductances and capacitances
are negligible.
The intrinsically safe power circuits are safely galvanically separated from each
other.
Recommend circuit breakers:
These separation switch devices are available as accessories.
Type
Description
Operating
voltage
MTL 5011 B
1-channel for contact
20 … 35 V DC
MTL 5015
2-channels for contact 20 … 35 V DC
KFA6-SR2-Ex1.WKFA6-SR2-Ex1.W 1-channel for contact
230 V AC
KFA6-SR2-Ex1.WKFA6-SR2-Ex1.W 2-channels for contact 230 V AC
