Hardware reference guide

Intrinsically Safe Modules
35013379 11/2011 405
Field Wiring
Field wiring to the module shall consist of separate shielded twisted pair wires. The
acceptable field wire gauge shall be AWG 20 to AWG 12. In a 2-wire field
configuration, the maximum field wire length is a function of the required accuracy.
Wiring between the module and the intrinsically safe field device should follow
intrinsically safe wiring practices to avoid the transfer of unsafe levels of energy to
the hazardous area.
RTD/Resistance Input Wiring
When the Universal Input module is configured as a RTD/Resistance Input module,
the maximum wire length (distance to a sensor) for a 3 or 4-wire configuration is 200
meters.
Thermocouple/Millivolt Input Wiring
When the module is configured as a Thermocouple/Millivolt Input module, the sum
of thermocouple source or voltage source impedance and wire resistance should not
exceed 200 ohms for rated accuracy.
Fixed Wiring System
The Quantum140AII33000 Intrinsically Safe Analog Input module is designed with
a fixed wiring system where the field connections are made to a 40-pin, fixed
position, blue terminal strip which is plugged into the module.
Terminal Strip Color and Keying Assignment
The module’s 140XTS33200 field wiring terminal strip is color-coded blue to identify
it as an intrinsically safe connector.
The terminal strip is keyed to prevent the wrong connector from being applied to the
module. The keying assignment is given below.
Module Class Module Part Number Module Coding Terminal Strip Coding
Intrinsically Safe 140AII33000 CDF ABE