Ukex Testing Standards; Understanding Approval Parameters; Entity Value Calculations; Fiber Optic Interface - Mettler Toledo IND500x Installationsanleitung

3.1.1.5 UKEX Testing Standards

BS EN IEC 60079-0:2018
BS EN 60079-11:2012
BS EN 60079-28:2015
BS EN 60079-31:2014
EN 60529:1991+ A:2000+ A2:2013

3.1.2 Understanding Approval Parameters

3.1.2.1 Entity Value Calculations

The power input, analog load cell, digital loadcells (IDNet or SICSpro), COM6, discrete inputs, discrete outputs
and CL interface of the terminal were reviewed for safety using the entity value method of evaluation. The entity
parameters for each of these connections can be found in Control Drawing #30595335. Refer to the approval
documentation of the peripheral device to be connected to the terminal for its entity parameters.
The following conditions must be met.
U or V
i
I or I
i max
P ≥ P
i
C + C
i cable
L + L
i cable
As an alternative to the direct Inductance calculation, the following inductance to resistance formula may be
substituted:
L / R
a max.
Where L
cable

3.1.2.2 Fiber Optic Interface

The fiber optic interface option in the terminal is approved by limiting the maximum power applied to the fiber
optic cable. The power is restricted by design to 5mW maximum. This restriction is shown in Control Drawing
#30595335.

3.1.3 United States Approvals

This section lists approval details for the terminal when installed according to United States requirements. The
U.S. safety approvals for the terminal are based upon entity values and fiber optic power restriction. The
terminal has been evaluated and approved as:
Intrinsically safe and suitable for use in Class I, Groups A-D; Class II, Groups E-G; Class III; Division 1, Zone 1
& 21 in accordance with entity requirements and METTLER TOLEDO Control Drawing #30595335.
Intrinsically Safe Class I, II, III, Division 1, Groups A, B, C, D, E, F and G / T4
Class I, Zone 1 AEx ib [op is Ga] IIC T4 Gb
Zone 21, AEx ib [op is Da] IIIC T60°C Db
Ta -10°C...+40°C, Hazardous (Classified) Locations; IP65
Control Drawing #30595335
Certificate FM21US0064X
Refer to the certificate or Control Drawing #30595335 for the approval entity values associated with the
terminal.

3.1.3.1 Special Conditions (FMus)

1. The non-metallic parts (display area) incorporated in the enclosure of this equipment may generate an
ignition-capable level of electrostatic charge.
The equipment shall not be installed in a location where build-up of electrostatic charge on such
surfaces shall occur.
The display area of the equipment shall only be cleaned with a damp cloth.
The plastic keypad must be replaced when the ESD protection layer is visibly worn.
50 Appendix​ ​
≥ U or V
max o oc
≥ I or I
o sc
or P
o t
≤ C or C
o a
≤ L or L
o a
< L / R
a cable cable
is the length-based inductivity value and R
General Requirements
Protection by Intrinsic Safety "i"
Protection using Optical Radiation "op is"
Dust ignition protection by Enclosure "t"
Degrees of protection provided by enclosures
(IPcode)
is the length specific resistance of the cable used.
cable
IND500x