JUMO 00577948, Safety Manual, Page: 6 / 26

1 Introduction
6
1.2 Description
The JUMO Ex-i power supply/input isolating amplifier 707530 is designed for operating intrinsically safe
transmitters (Ex-i) and mA current sources installed in potentially explosive (Ex) areas. The connected
2-wire transmitters are supplied with energy and analog 0/4 to 20 mA measured values are transmitted
from the potentially explosive area to the non-explosive area.
The external connection defines whether the device operates in supply isolating amplifier mode or iso-
lating amplifier mode. The output of the module can be operated in active or passive mode. Digital
(HART) communication signals can be superimposed over the analog measured value on the Ex or non
Ex side and transmitted bidirectional.
To increase the HART impedance in low-resistance systems an additional resistor can be activated in
the output circuit using the switch on the device's front. The device provides a 3-way electrical isolation
and the energy supply is designed as wide range power supply (24 to 230 V).
SIL measuring chains up to SIL2 and, in the event of a 2-channel setup, up to SIL3, are possible with
the Ex-i repeater power supply and input isolating amplifier.
1.3 Block diagram
Output signal voltage
0 to 5 V
1 to 5 V
Output signal current (active)
0 to 20 mA
4 to 20 mA
Output signal current (passive)
0 to 20 mA
4 to 20 mA
Voltage supply
AC/DC to 24 230 V
-20 +10 %, 50 60 Hz to to
Measuring input
Current
0 to 20 mA
4 to 20 mA
Transmitter voltage supply
> 16 V at 20 mA
> 15.3 V at 22.5 mA
Ex-i
Supply/Input Isolating
Amplifier
Power