Hardware reference guide
Intrinsically Safe Modules
434
35013379 02 October 2007
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.
Isolation
Channel to Channel
Channel to Bus
None
1780 Vac @ 47-63 Hz or 2500 Vdc for 1 min.
Update Time 1 sec. (all channels)
Fault Detection Out of range or broken wire
Bus Current Required 400 mA
Power Dissipation 2 W
External Power Not required for this module
Hot Swap Not allowed per intrinsic safety standards
Fusing Internal - not user accessible
Programming Software Modsoft Ver. 2.6 or higher or Concept Ver. 2.2 or higher
Notes:
1. Absolute accuracy includes all errors from the internal CJC, TC curvature, offset plus gain, for module temperature
of 0 ... 60° C. User-supplied TC errors not included.
2. For type J and K, add 1.5° C inaccuracy for temperatures below -100° C.
3. Type B cannot be used below 130° C.
4. All TC ranges have an open TC detect and upscale output. This results in a reading 7FFFh or 32767 decimal when
an open TC is detected.
Thermocouple/Millivolt Module Specifications
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com