6
CIT 400
pressure and level
3.2 Top-hat rail mounting
The unit will be fastened by snapping it onto an installed DIN top-hat rail with a minimum length
of 70 mm.
3.3 Front panel mounting
The front panel housing has to be fastened by using 2 screw-in clamps.
•
Push the panel housing front sided into the panel cut-out as far as possible.
•
Hang the 2 screw-in clamps into 2 opposed undercuts in the housing.
•
After that tighten the two set screws while holding the screw-in clamps firmly with the other
hand.
3.4 Electrical installation
For installation the lawful regulations of the respective country have to be observed.
The power supply must be separately protected by a 6 A slow-blow fuse and has to be iso-
lated from other facility parts (separate turn-off, e. g. by using an automatic cut-out with
>B< characteristics).
Please note during installation that electronic components may be destroyed by electrostatic
bursts. Therefore, avoid high electrostatic charge by providing proper ground connection.
Before impressing the rated voltage, the transmitter and sensor installation must be correctly
completed and checked.
All outer circuits, wires and lines connected to the device must have a minimum isolation re-
sistance of 250 V. If the voltage exceeds 42 V
DC
, a minimum isolation resistance
of 500 k
Ω
is necessary.
The section dimension of the power supply wires must be 0.75 mm² in accordance to
IEC 227 or IEC 245. To observe the degree of ingress protection, please refer to the technical
data in the appendix. The maximum switching voltage on the relay contacts must not exceed
250 V. Check if the devices’ power supplies have to be integrated into the emergency shutdown
conception of the facility.
When installing the device, the different types of housing (top-hat rail and front panel) have no
effect on the denomination of the terminal clamps, only their locations will vary.
For the electrical connection, please note the device’s configuration.
One copper wire with a maximum cross section of 2.5 mm² can be connected per clamp. Con-
nection is made by using terminal clamps and a screwdriver with a 2.5 mm blade. The terminal
clamps are normally unscrewed on delivery. Nevertheless, this must be checked before con-
necting the power supply or the signal wires.
Before first connection, it is necessary to have a slight pressure on the screw of the clamp-
ing connection to ensure a safe opening and a correct connection.
