Temperature Rating; Division 2 Application Example Using Load Cells - Mettler Toledo IND780 Guide D'installation

Temperature Rating

It is important that the temperature rating of the IND780 terminal be appropriate for
the environment in which it will be used. The IND780 terminal is approved for US
and Canada, ATEX and IECEx, with a temperature rating of T4 (135˚ C) for gas
and dust environments. This value must be lower than the Auto Ignition
Temperature (AIT) of the hazardous product in order to be safe. If the AIT of the
hazardous product is lower than the temperature rating of the IND780 terminal, the
IND780 terminal MUST NOT BE USED in that environment.
Division 2 Application Example Using Load
Cells
The following is an example of applying the IND780 terminal in a Division 2
application connecting a model 2158 Vertex floor scale with 50 feet of load cell
cable. The field circuit parameters for all devices and cables in the load cell line
(including the load cells and junction box) must also be known.
IND780 load cell field circuit parameters from control drawing 64069877:
IND780 Terminal Division 2 and Zone 2/22 Installation Manual
THE INTERNAL #22009911 DISCRETE I/O RELAY OPTION (KIT NUMBER
64057419) MUST NOT BE USED IN AN IND780 TERMINAL INSTALLED IN
AN AREA CLASSIFIED AS DIVISION 2 OR ZONE 2/22. FAILURE TO
COMPLY WITH THIS WARNING COULD RESULT IN BODILY HARM AND/OR
PROPERTY DAMAGE.
THE IND780 TERMINAL HAS BEEN APPROVED BY UL (U.S. AND
CANADA) WITH A TEMPERATURE RATING OF T4 (135° C) FOR USE
IN HAZARDOUS ENVIRONMENTS. IT HAS BEEN CERTIFIED FOR ATEX
IECEx WITH A TEMPERATURE RATING OF T4 (135° C) FOR GAS
AND DUST ENVIRONMENTS. IT MUST NOT BE USED IN AREAS
WHERE THE AUTO IGNITION TEMPERATURE OF THE HAZARDOUS
MATERIAL IS BELOW THIS RATING.
Terminal model: IND780 terminal (Division 2 approved)
Base model: 2158 VERTEX
Load cell model: METTLER TOLEDO 0745A
Quantity of load cells: 4
Load cell cable length: 50 feet
Junction box PCB p/n: 13640300A
V or U = 10.0 VDC
oc o
WARNING
WARNING
®
(with approved cells)
2-7