Burkert Type 6521 - Handbuch (Seite 5)

pe 6521 EEx i Technical Data Type 6521 EEx i System Description Type 6521 EEx i Installation of Type 6521 EEx i
Technical amendments reserved.
ents
nformity PTB 01 ATEX 2194 X
e 6115 for ignition protection type
f Operation of Type 6521
C 3/2-way valve,
pilot controlled, output 2 depressu-
rised at zero current
On the 3/2-way Namur
please observe the modifi ed pin
assignment (see table)
H 5/2-way valve, pilot controlled,
pressure port 1 connected to
output 2 at zero current, output 4
depressurised
Medium Compressed air non oiled,
instrument air
Neutral gasses
Flow rate QNn value 1370 l/min
Pressure range 1.2 ... 7 bar
Operating voltage 24 V (+15 % / -10 %)
Protection class IP 65
Protection class 3 according to EN 50178
Ignition protection type EEx ia IIC T6
Please observe specifi cations in the data sheet and on the rating
plate!
Housing and gasket materials
Terminal box: Aluminium, hard-anodized
Pneumatic amplifi er: Aluminium, powder-coated
Screws: Stainless steel
Piezo valve seal: FKM, NBR
Ambient Conditions
Ambient temperature -25 ... +65 °C
Due to the use of high-grade materials and coatings
it is possible to use the valve outdoors and in chemical
atmospheres.
Confi guration
The 6521 valve is comprised of a terminal housing with
an integrated piezo valve as well as a pneumatic amplifi er
(piston valve principle, no overlap).
Type 6521 is specially designed for operation with a PROFIBUS
®
PA valve connection.
The piston valve is metallically sealed. This prevents common
material problems with elastomer-sealed piston valves such as
malfunctions due to swelling or brittle seals.
Operation in potentially explosive areas
The devices may only be operated using suitable, intrinsically safe
operating equipment, e.g. with the PROFIBUS
®
PA valve control box type 8642.
The safety-relevant maximum values should be determined using
the Declaration of Conformity PTB 01 ATEX 2194 X.
Installation position: random;
Magnet system mounted in the upper
position prevents deposits settling in
the core chamber and increases the
service life
Before installation, clean the connecting fl ange and pipework
of any soiling
To protect against malfunctions use a dirt trap if necessary
Make certain that the performance data for the device
corresponds to the operating conditions!
Observe the pin assignment for pressure and exhaust air,
in particular the exception for the 3/2-way Namur version
(see table).
Electrical Connection of Type 6521
Loosen both screws (1 and 2) on the ter
Connect the wires to the correct termin
block (the polarity is indicated on the ho
WARNING!
All of the other screws in the termin
be accessed by authorised personn
5/2-way
(Namur or screw
thread connection) Exception!
3/2-way
Namur fl ange
pressure (P) exhaust air (R)
exhaust air (R) pressure (P)
exhaust air (S) closed
ns (2) and/or (4) depending on the model
ead connection g1/4 or Namur fl ange
WARNING!
Work on the valve may only be carried out by specialist
personnel using appropriate tools!
Delivery contents for Type 6521 EEx i
The delivery contents for devices with Namur fl anges include
2 fastening screws and a coding pen.
essure and exhaust air
Pneumatic
amplifi er
Coding pen
Technical Data System Description Installation Electrical Connection
(2,1) -1- 02_6521_EExi_GB.indd 19.06.2006 16:49:19 (2,1) -1- 02_6521_EExi_GB.indd 19.06.2006 16:49:19