1
INM9120 Rev 8
Host Pw
r
powe
r supply
- IIB
9122-IS
MTL FISC
O
On
1
ABOUT THIS MANUAL
The purpose of this manual is to provide the user with information on the installation, connection,
test and maintenance of the MTL912X range of
F
ieldbus
I
ntrinsically
S
afe
CO
ncept (FISCO)
power supplies.
Cautionary Note:
In common with all other electrical apparatus installed in hazardous areas,
this apparatus must only be installed, operated and maintained by competent personnel. Such
personnel shall have undergone training, which included instruction on the various types of
protection and installation practices, the relevant rules and regulations, and on the general
principles of area classification. Appropriate refresher training shall be given on a regular basis.
[See clause 4.2 of EN 60079-17].
This instruction manual supplements the requirements of nationally accepted codes of practice,
for example, IEC/EN 60079-11 in Europe. All installations should comply with the relevant
sections of these codes.
In addition, particular industries or end users may have specific requirements relating to the
safety of their installations, and these requirements should also be met.
1 .1
PRODUCT DESCRIPTION
The 9121-IS and 9122-IS are fieldbus repeater isolators that can relay fieldbus signals between
a host in a safe, or Zone 2 hazardous area and IS field devices in a Zone 1 hazardous area. They
provide DC power and an impedance terminator tothe IS fieldbus and also, if required, to the
host fieldbus.
1 .1 .1
Model 9121-IS
This can provide 120mA current, which typically would power at least six field devices in IEC Gas
Group IIC environments, where a typical device is considered to have a current consumption of
20mA
1 .1 .2
Model 9122-IS
For Gas Group IIB environments the 9122-IS can provide a higher output current of 256mA, which
will power at least twelve field devices rated at 20mA.
Host Pw
r
powe
r supply
- IIC
9121-IS
MTL FISC
O
On
