Tecfluid AMD For DP Series - Manual (Page 5)

6 TECHNICAL CHARACTERISTICS
Nominal voltage 8 V
Working voltage 5 ... 25 V
Power supply internal resistance 1 k 
Current with the vane into the slot  1 mA
Current with the vane out of the slot ≥ 3 mA
Standard: DIN EN 60947-5-6 (NAMUR)
Ambient temperature -25 ... +100 ºC
Type of protection IP67
Internal Inductance 250 µH
Internal Capacitance 50 nF
Marking II 1 G EEx ia IIC T6
Certificate PTB 99 ATEX 2219 X
7 SAFETY CHARACTERISTICS
Conforms to the Directive 2004/108/CE
Conforms to the Directive 2002/96/CE
Conforms to the Directive 94/9/CE
Given that this instrument is group II, it is intended for use in places likely to become
endangered by explosive atmospheres, but not in mines.
The category is 1G, that is, it is intended for use in areas in which explosive atmospheres
caused by mixtures of air and gases, vapours or mists are present continuously, for long
periods or frequently.
The front window must always be cleaned with a damp cloth, in order to avoid
electrostatic discharges.
If you don’t have the AMD sensor, the operation of the amplifier can be checked using the follow-
ing circuit diagram:
Amplifier
+
+
-
-
Multimeter
mA
NAMUR
connection
Potentiometer 20 k 
With the potentiometer we modify the current of the NAMUR amplifier. The switching point must be
between 1.2 mA and 2.1 mA. That is, with the current below 1,2 mA the output relay must have a
state and above 2,1 mA the output relay must have the other state.
AMD
+
-
1 k 
+
-
9 V Battery
(8.2 V Nominal for
NAMUR )
Multimeter
mA
+
-
5
-
+