Pressure

Pressure switches
Accessories
61
Accessories for EX 041 series
for intrinsically safe control circuits with short-circuit
and line break monitoring
EX 041
· 1-channel
· 1 failsafe relay output
according to DIN VDE 0660 Part 209
(BIA certificate no. 940 64)
· Control circuit EEx-ia IIC
· 1 progressive output with 1 normally open
contact
· 1 passive electronic output, error message
Application
Suitable for all safety-engineered pressure monitors/pressure
limiters, with microswitches and
resistor combination
ZF 576 ZF 574 ZF 577 ZF 575,
FD series
Technical data
Nominal voltage 230V, 48 Hz…62 Hz
Power consumption 3 W
Input (intrinsically safe) Terminals 10+, 12–
No-load voltage/short-circuit current
approx. 8.4 VDC/approx. 11.7 mA
Switching point
Relay dropped out J < 2.1 mA and J > 5.9 mA
Relay picked up 3.2 mA < J < 5mA
Line resistance
< 50 ohm. Cable capacitances and inductance
must be taken into account in the Ex area.
PTB approval PTB 00 ATEX 2043
Explosion protection, category EEx-ia
Outputs (not intrinsically safe)
Output I: (failsafe)
Relay terminals 13, 14
Output II: (not failsafe)
Relay terminals 15, 21
Contact load
AC: 250V/1 A/cos. > 0.7
DC: 24V/1 A resistive load
Output III
Error message (not failsafe)
Electronic output, passive, terminals 16+, 17–
Nominal voltage DC 10 V…30 V
Nominal current < 7 mA, short-circuit-proof
Switching frequency 5 Hz
Ambient temperature –20°C…+60°C
Installation Standard rail 35 mm.
Dimensions
40 x 115 x 93 (W x H x D).
The type EX 041 isolating amplifier is used for the transmission of intrinsically safe control commands
(e.g. from pressure switches) to non-intrinsically safe active circuits. In the event of short-circuit
or line break in the control circuit, the isolating amplifier switches to the safe side (see
“Direction of action” table). It also reacts to the safe side (output relay drops out) if internal component
failures and resultant errors occur.
Output I Relay output failsafe according to VDE 0660, Part 209, terminals separately led to the
outside for series connected protective interlock circuit, for example.
Output II Progressive output with relay stage (not failsafe).
Output III Alarm output potential-free (not failsafe).
Important note
The type EX 041 isolating amplifier can only be used together with pressure switches with resistor
combination (additional function ZF 576, ZF 577…, see also “Application” above).
Direction of action
Control circuit Output relay Status indicator Electronic
I and II yellow red output III
Switching contact closed picked up on off blocked
Switching contact open dropped out off off blocked
Line break or short-circuit dropped out off on switched
in the input circuit
through
Contact welding dropped out off on switched
Output I
through
Type designation
Type Supply voltage Power consumption
EX 041 230 V, 48…62 Hz 3 W
s