Series PC Manual V 1.0 - Rev. 3
– 03/01/01
DS Europe
25
12. PROTECTION FROM ELECTROMAGNETIC EXTERNAL
INTERFERENCE
NOTE: The measuring head, containing all the electronics, consists of a thick die-cast
aluminium alloy box.
It is sealed (at least IP 65) with a rubber sealing and the cover is clamped with four screws
on the box.
Under these conditions the series PC satisfies the EC Regulations, which are listed in the
manual.
For industrial installation, where there is a great deal of electromagnetic interference, you
are advised to take the following installation provisions for general use:
•
Ground the metal frame to which the transducer is clamped. Better to have a grounding
well separate from the main factory ground network, which is always full of electric
interference.
•
Ground the shield of the interconnection cable towards the conditioning electronics, to
prevent ground looping.
•
Should there be excessive interference, put the interconnection cable inside a steel
tube (paramagnetic) with external insulation and connect it to ground near the
transducer (from the opposite side of the cable shield).
•
Apply all the ground and safety regulation.
•
Where there are long stretches of interconnecting cables
, solder cable joints inside the
metal junction boxes.
The shielding must not be locally grounded in the casing itself, but interconnected with
one another.
•
To obtain CE marking the measuring head and the interconnecting cables must be
grounded (on a good ground).
The measuring head is fitted with a ground terminal.
13.
CALIBRATION METHODS
To calibrate the PC ( PCS, PCR, etc. ) the following procedure can be used:
•
Using two push buttons inside the transducer and a tester connected to the analog
output of the D/A 1 (
reduced calibration
, only usable if the transducer has D/A 1 ).
•
Using remote unit ( PC, PLC, etc. ) and software.
Both permit you to calibrate transducer in a simple way. Using the serial connection makes
everything easier as you have the added advantage of being able to personalise the
analog output performance.
