Flow Meter Interface; Incendive Inputs And Outputs; Discrete I/O Relay Option - Mettler Toledo IND780 Installationsanleitung

IND780 Terminal Division 2 and Zone 2/22 Installation Manual

Flow Meter Interface

The Flow meter connection is rated non-incendive on the IND780 terminal by both
UL and DEMKO. The field circuit parameters are listed next.

Incendive Inputs and Outputs

If a specific input or output is rated incendive, then special wiring precautions must
be taken to protect the wiring in the Division 2 or Zone 2/22 area. Refer to the
electrical regulations for the country of installation for specific wiring requirements.
Note that the United States and Canada requires installation of conduit hubs and
conduit to protect incendive signals. Refer to the first part of this chapter for details.
All inputs and outputs to the IND780 terminal not listed in the section above as
non-incendive must be treated as incendive.

Discrete I/O Relay Option

An arcing or sparking device cannot be used inside the Division 2 or Zone 2/22
hazardous area without use of a properly rated enclosure or other nationally
approved protection. Because the optional Discrete I/O Relay board contains non-
sealed relays, it cannot be installed and used in an IND780 used within a Division
2 or Zone 2/22 hazardous area.
If discrete inputs and outputs are required, the Discrete I/O Solid State option (Kit
number: 64057422, PCB: 22009913, as shown in the control drawing) can be
used. It is also possible to use an ARM100 remote module (#71209352), which
must be located in the safe area or inside a properly rated enclosure. The Discrete
I/O Relay option (Kit number: 64057419, PCB 22009911) MUST NOT BE USED
in an area classified as Division 2 or Zone 2/22.
2-6
CANBus Communication
Listening
cULus ATEX/IECEx
L = 0 µH L = 0 µH
i i
cULus
V = 26.8 VDC
max
I = 200 mA
max
C = 0 µF
i
L = 30 µH
i
Talking
cULus ATEX/IECEx
L = 2 mH L = 2 mH
a o
ATEX/IECEx
U = 26.8 VDC
i
I = 200 mA
i
C = 0 µF
i
Li = 30 µH